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LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 I

LINAC12 XXVI International Linear Accelerator

Conference

September 9 – 14, 2012

Dan Panorama Hotel

Tel Aviv, Israel

http://www.linac12.org.il

Conference Guide

http://www.linac12.org.il/

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 II

Contents Welcome………………………………..….…. III

Conference Organization ………….…….…... VI

Venue & Conference Hotels.………...…..…… VII

Emergency Information……………..……… VII

Internet & Other Services…………….……… VIII

Registration……………………………..……. VIII

Social Program & Site Tour….…….………… IX

Companion Program………….….……….… X

Industrial Exhibition……………..…......…… X

Sponsors...................................….…………… XI

Proceedings Office.........................…….……. XII

Scientific Program ……………………...…… XII

Program Schedule ........……………..….….… XIV

Abstracts .......................………………..…… 1

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 III

Welcome!

On behalf of Soreq NRC, LINAC International Organizing Committee, LINAC12

Scientific Program Committee and LINAC12 Local Organizing Committee, it is a

great pleasure for me to welcome you to Tel Aviv, for the XXVI International

Linear Accelerator Conference, which for the first time takes place in Israel.

LINAC12 will continue the excellent tradition of this bi-yearly conference

series, covering LINAC technology and related science. The scientific program

includes invited talks, oral poster presentations and poster sessions describing

the most advanced and exciting LINAC projects in the world. The Dan Panorama

Conference Venue has been specially set up to ensure continuous and lively

discussions amongst scientists and industrial partners during the poster sessions

and coffee breaks.

We are especially proud of the unprecedented amount and quality of students

and post-doctoral fellows that are attending this conference. These young

researchers are the future of our community. Hosting them was made possible

mainly due to generous support from LINAC10.

In addition to the scientific program, we have planned for you a rich social

program, aimed at introducing you to the special culture, scenery and history of

Israel and the Middle East. We encourage you to become acquainted with Tel

Aviv, which offers the beauty of its four kilometers long Mediterranean

seashore, combined with electrifying night life in the "city that never sleeps".

We thank you for attending LINAC12 and wish you an enjoyable and rewarding

stay. We hope that our conference will enable you to successfully present your

recent achievements, learn of new scientific and engineering developments,

sprout novel exciting ideas and initiate new business relations.

Sincerely,

Israel Mardor, Soreq NRC

LINAC12 Conference Chair

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 IV

CONFERENCE ORGANIZATION

Key Contacts Israel Mardor, Chair, LINAC12 International Organizing Committee

Dan Berkovits, Chair, LINAC12 Scientific Program Committee

Joseph Luner, Chair, LINAC12 Local Organizing Committee

Emergency Phone Numbers There are two phone numbers that can be used if someone needs to reach you in an

emergency. Dan Panorama lobby:

+972-3-5190190 (03-5190190)

Registration Desk (during registration desk opening hours, detailed below):

+972-3-5108417 (03-5108417)

Ortra Office in Tel Aviv:

+972-3-6384444 (03-6384455)

( ): from inside Israel

International Organizing Committee

Israel Mardor (Chair), Soreq, Israel

Dan Berkovits (SPC Chair), Soreq, Israel

Jim Alessi, BNL, USA

John Barnard, LLNL, USA

Winfried Barth, GSI, Germany

Michael Borland, ANL, USA

Swapan Chattopadhyary, Cockcroft, UK

Jean Delayen, ODU, USA

Michael Fazio, LANL, USA

Roland Garoby, CERN, Switzerland

Terence Garvey, PSI, Switzerland

Kazuo Hasegawa, JAEA, Japan

Hitoshi Hayano, KEK, Japan

Andrew Hutton, JLAB, USA

Yoshihisa Iwashita, Kyoto U., Japan

Kevin Jones, SNS, USA

Horst Klein, U. Frankfurt, Germany

Andre Kolomiets, ITEP, Russia

Leonid Kravchuk, INR, Russia

L. K. Len, DOE, USA

Lia Merminga, TRIUMF, Canada

Alban Mosnier, CEA, France

Won Namkung, Postech, Korea

Guoxi Pei, IHEP, China

Paolo Pierini, INFN, Italy

Milorad Popovic, FNAL, USA

John Seeman, SLAC, USA

Alessandro Variola, LAL, France

Hans Weise, DESY, Germany

Yoshishige Yamazaki, MSU, USA

Yanglai Cho, ANL, USA

Marion White, ANL, USA

Stanley Schriber, Idaho, USA

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 V

Scientific Program Committee

Dan Berkovits (Chair), Soreq NRC, Israel Giorgio Apollinari, Fermilab, USA John Barnard, LLNL, USA Kip Bishofberger, LANL, USA Patrick Bertrand, GANIL, France Graeme Burt, CI/U Lancaster, UK Yong Ho Chin, KEK, Japan Yong-Sub Cho, KAERI, Korea Stefan Choroba, DESY, Germany Manoel Conde, ANL, USA Jean Delayen, ODU, USA Alberto Facco, INFN/LNL,Italy Robin Ferdinand, GANIL, France Alexander Feschenko, RAS/INR, Russia David Findlay, STFC/RAL/ISIS, UK Arne Freyberger, Jlab, USA Josef Frisch, SLAC, USA Shinian Fu, IHEP Beijing, PR China John Galambos, ORNL/SNS, USA Roland Garoby, CERN, Switzerland Terence Garvey, PSI, Switzerland Cameron Geddes, LBNL, USA Frank Gerigk, CERN, Switzerland Lars Groening, GSI, Germany Hirofumi Hanaki, JASRI/SPring-8, Japan Kazuo Hasegawa, JAEA, Japan Sang-Ho Kim, ORNL/SNS, USA In Soo Ko, POSTECH, Korea Andrei Kolomiets, ITEP, Russia Geoffrey Krafft, JLab, USA Robert Laxdal, TRIUMF, Canada Lek. K. Len, DOE, USA Matthias Liepe, Cornell/CLASSE, USA Frank Marhauser, Muons Inc. USA Olivier Napoly, CEA, France Subrata Nath, LANL, USA Akira Noda, Kyoto ICR, Japan Yujiro Ogawa, KEK, Japan Peter Ostroumov, ANL, USA Paolo Pierini, INFN/LASA, Italy Milorad Popovic, Fermilab, USA Deepak Raparia, BNL, USA Tor Raubenheimer, SLAC,USA Amit Roy, IUAC, India Alwin Schempp, IAP Frankfurt, Germany Daniel Schulte, CERN, Switzerland Nikolay Solyak, Fermilab, USA Mike Syphers, MSU, USA Sami Tantawi, SLAC, USA Aleksey Tribendis, BINP, Russia Alessandro Variola, LAL, France Hans Weise, DESY, Germany Marion White, ANL, USA Richard York, MSU, USA Hongwei Zhao, IMP Lanzhou PR, China Israel Mardor, Soreq NRC, Israel (IOC Chair)

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 VI

Local Organizing Committee

Joseph Luner (Chair), Soreq, Israel

Israel Mardor (IOC Chair), Soreq, Israel

Dan Berkovits (SPC Chair), Soreq, Israel

Yong Ho Chin, KEK, Japan

Mick Draper, CERN, Switzerland

Yair Yariv, Soreq, Israel

Arik Kreisel, Soreq, Israel

Lea Ben Ari, Soreq, Israel

Yakir Ben Aliz, Soreq, Israel

Boaz Kaizer, Soreq, Israel

Gitai Feinberg, Soreq, Israel

Lior Cohen, Soreq, Israel

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 VII

VENUE & CONFERENCE HOTELS

Venue and main Hotel Dan Panorama Hotel

Charles Clore Park, Tel Aviv 68012, ISRAEL

Phone: +972-3-5190190 (03-5190190)

Fax: +972-3-5171777 (03-5171777)


Conference Hotels The Savoy Hotel 5 Geula St. 61049

Phone: +972-3-5140500 (03-5140500)


Prima Tel-Aviv Hotel

105 Hayarkon St. 63432 Tel-Aviv, ISRAEL

Phone: +972-3-5275660 (03-5275660)

Fax: +972-3-760-2244 (03-7602244)


Mercure Tel-Aviv City Center

14 Ben Yehuda St. 61032 Tel-Aviv, ISRAEL

Phone: +972-3-6288888 (03-6288888)

Fax: +972-3-6203203 (03-6203203)


EMERGENCY INFORMATION

Emergency Phone Numbers Police: 100

Ambulance: 101

Fire: 102

Hospital in Tel Aviv The Tel Aviv Sourasky Medical Center (Ichilov)

Phone: +972-3-697-4444 (03-6974444)

+972-3-697-3202 (03-6973202)


Address: 6 Weizmann Street, Tel Aviv 64239, Israel

Banking and Currency Exchange

Currency exchange between ILS, USD and Euro is available at the all banks and post office

branches. They also accept Traveler’s Checks.

We recommend using Bank and Post Office service ONLY.

Cash withdrawal with your credit card is available at most ATMs at banks and the post office

branches.

INTERNET & OTHER SERVICES

Wireless Internet Wireless Internet is available to all delegates in the Dan Panorama conference center.

User Name: LINAC12

Password: LINAC12

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 VIII

Internet Café An Internet Café is available at the Foyer.

Internet Café hours are: Monday, September 10 08:30 - 18:00

Tuesday, September 11 08:30 - 18:00

Wednesday, September 12 08:30 - 12:00

Thursday, September 13 08:30 - 18:00

Friday, September 14 08:30 - 12:30

Speakers preview room

A speakers review room is located at Sharon Hall. Speakers can preview/test their

presentations and upload them to the SPMS system.

Use of individual laptops cannot be accommodated.

REGISTRATION

Hours and Location The registration desk will be open at the following times and location: Sunday, September 9

16:00 to 20:00 (Convention center entrance)

Monday, September 10


Tuesday, September 11


Wednesday, September 12


Thursday, September 13

08:30 to 17:00 (Convention center entrance) Friday, September 14


Your registration fee includes attendance at all technical sessions of the conference, the

Conference Guide and participation in social events.

Extra Tickets Extra individual tickets for the Welcome Reception, Excursion and Banquet are limited.

If there are any tickets left, they will be available at the Registration Desk.

Message Board A message board is located beside the registration desk.

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 IX

Security and Insurance Participants are asked not to leave their belongings unattended and to wear their conference

badges at all LINAC12-sponsored events.

The conference organizers cannot accept liability for personal injuries sustained or for loss or

damage to participants’ (or companions’) personal property during the conference.

Name Tags Participants are requested to wear their name tags during all meetings and social events

whether in or out of the hotel.

Luggage Storage The hotels will provide luggage storage for their guests on arrival and departure days.

SOCIAL PROGRAM & SITE TOUR

Summary of Events Sunday Student Poster Session Welcome Reception Wednesday Excursion – Jerusalem Old City Thursday Banquet at the "East" Friday SARAF Tour (not included in registration fee)

Social Events Sunday, September 9 Student Poster Session [18:00] Welcome Reception [18:00] A welcome reception will be held at the Dan Panorama Conference Center in the Foyer +

BCD Halls + Judeah Hall.

All registrants are invited to attend.

Wednesday, September 12 [12:00] Jerusalem Old city Tour

Dinner at the Bible Lands Museum, Jerusalem

Thursday, September 13 [19:00] Banquet The "East" The banquet will take place in a location that is 15 minutes driving from the Conference

Venue and hotels.

We will provide a shuttle bus service to and from the banquet. Details will be provided during

the conference.

Friday, September 13 [12:30] Conference tour to SARAF at Soreq NRC

12:30 Departure from hotel's lobby

13:20-16:20 Tour at SARAF

17:00 Estimated time at Ben Gurion International airport (if requested in advance)

17:30 Estimated time back at the hotel

Further updated details regarding the SARAF tour will be available at the conference message

board.

Please note that if you registered a companion to the SARAF tour than they should come in

person to collect their tour ticket, not later than September 14, at 11:30.

Please note that entrance to Soreq NRC with cameras, recording devices,

laptops, memory sticks, disks, etc. is prohibited.

http://blmj.org/en/Calendar/News/114/2012-06-01.php

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 X

COMPANION PROGRAM

We are offering three companion tours on Sep. 10 (Mon), Sep. 11 (Tue), and Sep. 13 (Thu) to

companions attending the LINAC12 conference.

We have selected three of the most popular tours:

Monday September 10

Architecture in Tel Aviv: Bauhaus – The "White City"

Tuesday September 11

Zichron Ya'akov & Haifa

Thursday September 13

Tel Aviv Shopping– Markets

These tours will leave from the Dan Panorama Hotel Lobby accompanied by English

speaking guides.

Tickets may be purchased upon availability at the Registration Desk.

INDUSTRIAL EXHIBITION

Hours and Location The Industrial exhibition booths are located at Dan Panorama Conference Center in the Foyer

+ BCD Halls.

Exhibit hours are: Sunday, September 9 18:00 to 20:00

Monday, September 10 09:00 to 18:00 Tuesday, September 11 09:00 to 18:00 Wednesday, September 12 09:00 to 12:00 Thursday, September 13 09:00 to 18:00

List of Exhibitors Exhibitors and sponsors registered at the present time: Advanced Energy Systems, Inc.

Advanced Technology & Materials Co. Ltd.

Bruker BioSpin

Cosylab D.D.

Danfysik

Forster Bau GmbH

Instrumentation Technologies D.D.

Kress GmbH

National Instruments Israel

NTG - Neue Technologien GmbH &coKG

Oerlikon Mechatronics AG

Pantechnik

PMB

RadiaBeam Technologies

RI Research Instruments

Scandinova Systems AB

Thales Electron Devices

Toshiba Electron Tubes

VDL ETG

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 XI

SPONSORS

List of Sponsors:

RI Research Instruments

National Instruments Israel

Magnetic Shields Limited

Financial Support for Students and Post-doctoral fellows We would like to thank the organizers of LINAC10, who helped bring an unprecedented

amount and quality of students and post-doctoral fellows to LINAC 12 in Tel-Aviv:

Chen Xu College of Willian & Mary and JLAB Subashini de Silva Old Dominion University Christopher Hopper Old Dominion University Anna Grassellino FNAL Jeremiah Holzbauer Argonne National Laboratory Durga Rajaram IIT Chaopeng Wang SINAP Shanghai Wencheng Fang SINAP Shanghai Duan Gu SINAP Shanghai Cong Zhang IMP Lanzhou Meng Xin Xu IMP Lanzhou Shoubo He IMP Lanzhou Zhijun Wang IMP Lanzhou Bai Jiaoni IHEP Beijing Yasuhiro Fuwa Kyoto University Julia Vogt Helmholtz-Zentrum Berlin Terry Atkinson Helmholtz Zentrum Berlin Yuriy Petenev Helmholtz Zentrum Berlin Janet Schmidt IAP - Frankfurt University Benjamin Koubek IAP - Frankfurt University Florian Dziuba IAP - Frankfurt University Marco Busch IAP - Frankfurt University Domink Mäder IAP - Frankfurt University Florian Hug TU Darmstadt Taras Bondarenko MEPhI Alexander Plastun MEPhI Alexey Levichev Budker INP, Novosibirsk Gabriele Costanza Lund University Juergen Pfingstner CERN Alexander Gerbershagen CERN Robert Ainsworth University of London Lee Carver University of Manchester Francesco Scantamburlo UT Cad Meccanico I.N.F.N. Erez Danieli Ariel University Center Harry Marks Tel Aviv University Ariel Nause Tel Aviv University

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 XII

PROCEEDINGS OFFICE

Hours and Location The Proceedings Office is located at Tamar Hall. Editorial staff will process papers before and

during the conference. The paper submission deadline was Thursday, September 6. Authors

are requested to check on their papers via the status board that will be located in or near the

Proceedings Office. Authors can also check the paper status by logging into their SPMS

accounts. If the paper has a YELLOW dot, they can accept the changes and turn it to GREEN

themselves.

Proceedings Office hours are: Sunday, September 9 15:00 - 18:00

Monday, September 10 09:00 - 18:00

Tuesday, September 11 09:00 - 18:00

Wednesday, September 12 09:00 - 11:30

Thursday, September 13 09:00 - 18:00

Friday, September 14 09:00 - 11:00

The conference proceedings will be published on the Joint Accelerator Conferences Website

(JACoW): http://www.JACoW.org

SCIENTIFIC PROGRAM

Oral Sessions All oral sessions will be in the Main Conference Hall. A preview/testing area is available for

speakers in Sharon Hall

Please note that all speakers must upload their presentations to our file server following the

instructions below. Use of individual laptops cannot be accommodated.

The deadline for the presentation file upload is at 17:00 on the day before your talk for invited

speakers and at 17:00 on Sunday September 9 for all the speakers in oral poster sessions.

In uploading your presentation file, please follow the instructions described in the following

web page: http://www.linac12.org.il/oral.ehtml

Student Poster Session A special poster session for students will take place during registration on Sunday, September 9. Student posters should be mounted in BCD Halls+ Foyer at 16:00 and manned from 16:30 to

19:30 for judging and from 18:00 to 20:00 for general viewing.

In accordance with the guidelines for publication of contributions, these posters must also be

displayed during the regular poster sessions.

Poster Sessions There will be three poster sessions during the conference.

The poster sessions will take place at BCD Halls + Foyer.

Each session will begin with one hour oral session at the main conference hall .

Monday, September 10 14:50 to 17:50 Tuesday, September 11 14:50 to 17:50 Thursday, September 13 15:00 to 18:00

http://www.linac12.org.il/oral.ehtml

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 XIII

Poster halls will be ready at 11:00. Posters should be in place no later than 12:30 and should

be taken down at the end of each session. Any posters not removed by 18:30 will be removed by staff and discarded.

Authors are reminded that no contributions are accepted for publication only. Any paper that

is not presented at the conference will be excluded from the proceedings. The Scientific Program Committee reserves the right to refuse papers for publication that

have not been properly presented or staffed in the poster sessions. Manuscripts of

contributions to the proceedings (or enlargements of them) are not considered to be posters,

and papers represented in this way will not be accepted for publication.

Identification of Contributions The date and type of presentation for each contribution in the program can be easily identified

from the program code, which is composed as follows:

The first two letters indicate the day: SU, MO, TU, WE, TH, FR.

For oral sessions, the third letter indicates the order of the session (1, 2, or 3).

For posters sessions, the third letter is a P.

Abstracts that will be presented orally in the Main Conference Hall have an additional

code letter A and abstracts that are displayed as posters in the Posters Hall have an

additional letter B in the code. A two or three digit sequence number

Please notice that in LINAC12, we introduce a new concept for the marking of poster

abstracts that have been accepted also for 5-minute oral presentations or for the Sunday

Student Poster Session.

These poster abstracts appear TWICE in SPMS, with TWO SEPARATE CODES, one for the

standard poster session and one for the special session. Abstracts that will be presented in the

5-minute oral-poster sessions have an additional letter L in their code. The codes for posters

to be presented in Sunday's poster session start with SU.

In the Conference Guide, when relevant, abstracts will appear more than once, according to

the chronological order of the presentations during the conference. In the conference

proceedings, poster papers will appear only once, with the code that pertains to their standard

session.

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 XIV

Monday, 10 September 2012

09:00 - 10:50 Oral Session MO1 Main Conference Hall – Chair: Israel Mardor

09:00 Conference Opening and Welcome 09:30 Operational experience and future goals of the SARAF Linac at SOREQ

Dan Berkovits (Soreq) 10:00 Status of the European XFEL Project

Winfried Decking (DESY) 10:30 SRF Linac technology development

Vyacheslav P. Yakovlev (FNAL)

10:50 – 11:20 Coffee Break

11:20 – 12:20 Oral Session MO2 Main Conference Hall – Chair: Lars Groening

11:20 Recent Achievements on Laser Plasma Accelerators Victor Malka (LOA)

11:50 Increased understanding of beam losses from the SNS linac proton experiment John Galambos (ORNL)

12:20 – 13:30 Lunch

13:30 – 14:50 Oral Session MO3 Main Conference Hall – Chair: Milorad Popovic

13:30 Development of H-mode Cavities Linacs for the FAIR Project Gianluigi Clemente (GSI)

13:50 Commissioning of a new injector for the RIKEN RI-Beam Factory Naruhiko Sakamoto (RIKEN Nishina Center)

14:10 FRANZ Accelerator Test Bench and Neutron Source Oliver Meusel (IAP)

14:30 Accelerator/Decelerator of Slow Neutrons Masaaki Kitaguchi (KURRI)

14:50 – 15:50 Oral Poster Session MOPL Main Conference Hall – Chair:

15:50 – 17:50 Poster Session MOP BCD Halls + Foyer

Tuesday, 11 September 2012

08:30 – 10:20 Oral Session TU1 Main Conference Hall – Chair: Alberto Facco

08:30 Status of the IFMIF-EVEDA 9 MeV 125 mA deuteron linac Alban Mosnier (CEA-F4K)

09:00 Status of Fermilab Project X Stuart Henderson (FNAL)

09:20 Chinese ADS Project and Proton Accelerator Development Weimin Pan (IHEP)

09:40 Status and challenge of FRIB project Jie Wei (MSU)

10:00 Status and Commissioning Plan of Korean PEFP (Proton Engineering Frontier Project) Hyeok-Jung Kwon (KAERI)


LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 XV

10:50 – 12:20 Oral Session TU2 Main Conference Hall – Chair: Yong Ho Chin

10:50 Review of FEL Projects John Corlett (LBNL)

11:20 Overview of SACLA Machine Status Yuji Otake (SPring-8)

11:40 LCLS Operation Experince and LCLS-II Design Tor Raubenheimer (SLAC)

12:00 High Current ERL at BNL Ilan Ben-Zvi (BNL)

12:20 – 13:30 Lunch

13:30 – 14:50 Oral Session TU3 Main Conference Hall – Chair: Giorgio Apollinari

13:30 Synchronization of Accelerator Sub-Systems with Ultimate Precision Holger Schlarb (DESY)

13:50 Advances in Photonic and Metamaterial RF structures Rebecca Seviour (Huddersfield University)

14:10 First electron beam operation of the LANL NCRF photoinjector Nathan A. Moody (LANL)

14:30 Electron Beam Current-Profile Shaping Via Transverse-to-Longitudinal Phase-Space Exchange Yin-E Sun (FNAL)

14:50 – 15:50 Oral Poster Session TUPL Main Conference Hall – Chair:

15:50 – 17:50 Poster Session TUP BCD Halls + Foyer

Wednesday, 12 September 2012

08:30 – 10:30 Oral Session WE1 Main Conference Hall – Chair: Subrata Nath

08:30 ERL-Based Light Source Challenges Yukinori Kobayashi (KEK)

09:00 Status and Future of the CLIC Study Roberto Corsini (CERN)

09:20 Application of X-band Linacs Gerardo D'Auria (Elettra)

09:50 The ARIEL Superconducting electron Linac Shane Rupert Koscielniak (TRIUMF)

10:10 Linac-based laser Compton scattering X-ray and gamma-ray sources Ryoichi Hajima (JAEA)


11:00 – 12:10 Oral Session WE2 Main Conference Hall – Chair: Hongwei Zhao 11:00 RF power production at the two beam test stand at CERN

Igor Syratchev (CERN) 11:30 Solid State Marx Modulators for Emerging Applications - CLIC, ESS, ILC &

Project X Mark A. Kemp (SLAC)

11:50 High-Field Short-Period Microwave Undulators Jeffery Neilson (SLAC)

12:10 Conference Outing

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 XVI

Thursday, 13 September 2012

08:30 – 10:30 Oral Session TH1 Main Conference Hall – Chair: Peter Ostroumov

08:30 Results achieved by the S1-Global Collaboration for ILC Hitoshi Hayano (KEK)

09:00 Compact Superconducting Crabbing and Deflecting Cavities Subashini Uddika De Silva (Old Dominion Univ.)

09:30 Superconducting RF Spoke Cavities for Electron and High-velocity Proton Linacs Jean Roger Delayen (Old Dominion Univ.)

09:50 Superconducting Linac and associated developments at IUAC Delhi Amit Roy (IUAC)

10:10 Emittance-partitioning strategies for future accelerator applications Kip Bishofberger (LANL)


11:00 – 12:30 Oral Session TH2 Main Conference Hall – Chair: Shinian Fu

11:00 Parameter choice for the ESS linac design Mats Lindroos (ESS)

11:30 SPIRAL2 accelerator construction progress Patrick Bertrand (GANIL)

11:50 Design, construction and commissioning of the Linac4 accelerating structures Frank Gerigk (CERN)

12:10 Student Prize Winner Talk

12:30 – 13:40 Lunch

13:40 – 15:00 Oral Session TH3 Main Conference Hall – Chair: Stefan Choroba

13:40 Status of ILC Akira Yamamoto (KEK)

14:00 JLAB Upgrade Fulvia C. Pilat (JLAB)

14:20 ERL-Based Lepton-Hadron Colliders: eRHIC and LHeC Frank Zimmermann (CERN)

14:40 Plasmas, Dielectrics and the Ultrafast: First Science and Operational Experience at FACET Christine Clarke (SLAC)

15:00 – 16:00 Oral Poster Session THPL Main Conference Hall – Chair:

16:00 – 18:00 Poster Session THP BCD Halls + Foyer

19:15 Conference Banquet

LINAC2012 – Tel Aviv, Israel, 9-14 September, 2012 XVII

Friday, 14 September 2012

08:30 – 10:30 Oral Session FR1 Main Conference Hall – Chair: Robert Laxdal

08:30 Heavy ion stripper Felix Marti (MSU)

09:00 Light ion ECR sources state of the art for Linacs Raphael Gobin (CEA/IRFU)

09:20 Commissioning and Operation of the Californium Rare Ion Breeder Upgrade at the ATLAS facility Peter Ostroumov (ANL)

09:50 In Flight Ion Separation using a Linac Chain Colin Morton (TRIUMF)

10:10 SARAF Phase 2 linac physical design study Jacob Rodnizki (Soreq)


11:00 – 12:30 Oral Session FR2 Main Conference Hall – Chair: Roland Garoby

11:00 Recovery of the J-PARC Linac from the Earthquake Kazuo Hasegawa (J-PARC, KEK & JAEA)

11:30 Antihydrogen trapping at the Alpha-CERN experiment Elazar Sarid (NRCN)

12:00 Conference Closing

12:30 SARAF Tour

Contents

SUPB — Student Poster Session & Reception . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3MO1A — Opening Session Monday Morning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

MO1A01 Operational Experience and Future Goals of the SARAF Linac at SOREQ . . . . . . . . . . . . . . . . 10MO1A02 Status of the European XFEL – Constructing the 17.5 GeV Superconducting Linear Accelerator . . . 10MO1A03 SRF Linac Technology Development at Fermilab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

MO2A — Invited Oral Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11MO2A01 Recent Achievements on Laser Plasma Accelerators . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11MO2A02 Increased Understanding of Beam Losses from the SNS Proton Linac Experiment . . . . . . . . . . . 11

MO3A — Invited Oral Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12MO3A01 Development of H-mode Cavities Linacs for the FAIR Project . . . . . . . . . . . . . . . . . . . . . . . 12MO3A02 Commissioning of a New Injector for the RIKEN RI-Beam Factory . . . . . . . . . . . . . . . . . . . . 12MO3A03 FRANZ – Accelerator Test Bench and Neutron Source . . . . . . . . . . . . . . . . . . . . . . . . . . . 12MO3A04 Accelerator/Decelerator of Slow Neutrons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

MOPLB — Poster Orals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13MOPLB01 Emittance Control for Different FACET Beam Setups in the SLAC Linac . . . . . . . . . . . . . . . . 13MOPLB02 Positron Injector Linac Upgrade for SuperKEKB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13MOPLB03 Advances in Beam Tests of Dielectric-based Accelerating Structures . . . . . . . . . . . . . . . . . . 13MOPLB04 A 10 MeV L-band Linac for Irradiation Applications in China . . . . . . . . . . . . . . . . . . . . . . 13MOPLB05 Applications of Compact Dielectric Based Accelerators . . . . . . . . . . . . . . . . . . . . . . . . . . 13MOPLB06 Fermilab 1.3 GHz Superconducting RF Cavity and Cryomodule Program for Future Linacs . . . . . 14MOPLB07 Non-destructive Inspections for SC Cavities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14MOPLB08 Normal Conducting Deflecting Cavity Development at the Cockcroft Institute . . . . . . . . . . . . 14MOPLB09 Status of the C-Band RF System for the SPARC-LAB High Brightness Photoinjector . . . . . . . . . 14MOPLB10 FRIB Technology Demonstration Cryomodule Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14MOPLB11 The Upgraded Argonne Wakefield Accelerator Facility (AWA): a Test-Bed for the Development of

High Gradient Accelerating Structures and Wakefield Measurements . . . . . . . . . . . . . . . . . . . 15MOPLB12 Local Energy Spectrum Measurement on Tsinghua Thomson Scattering X-ray Source . . . . . . . 15

MOPB — Poster Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16TU1A — Invited Oral Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

TU1A01 Status of the IFMIF-EVEDA 9 MeV 125 mA Deuteron Linac . . . . . . . . . . . . . . . . . . . . . . . . 32TU1A02 Status of Fermilab Project X . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32TU1A03 Chinese ADS Project and Proton Accelerator Devekopment . . . . . . . . . . . . . . . . . . . . . . . . 32TU1A04 FRIB Accelerator Status and Challenges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32TU1A05 Status and Commissioning Plan of the PEFP 100-MeV Linear Accelerator . . . . . . . . . . . . . . . . 32

TU2A — Invited Oral Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33TU2A01 Review of FEL Projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33TU2A02 Overview of SACLA Machine Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33TU2A03 LCLS Operation Experience and LCLS-II Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33TU2A04 High Current ERL at BNL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

TU3A — Invited Oral Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34TU3A01 Synchronization of Accelerator Sub-systems with Ultimate Precision . . . . . . . . . . . . . . . . . . 34TU3A02 Advances in Photonic and Metamaterial RF structures . . . . . . . . . . . . . . . . . . . . . . . . . . . 34TU3A03 First Electron Beam Ooperation of the LANL NCRF Photoinjector . . . . . . . . . . . . . . . . . . . . 34TU3A04 Electron Beam Current-profile Shaping via Transverse-to-longitudinal Phase-space Exchange . . . 34

TUPLB — Poster Orals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35TUPLB01 The Swiss FEL RF Gun: RF Design and Thermal Analysis . . . . . . . . . . . . . . . . . . . . . . . . . 35TUPLB02 Deflecting Structures with Minimized Level of Aberrations . . . . . . . . . . . . . . . . . . . . . . . 35TUPLB03 sFLASH – Direct FEL Seeding - First Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35TUPLB04 Results of Testing of Multi-beam Klystrons for the European XFEL . . . . . . . . . . . . . . . . . . . 35TUPLB05 First Demonstration of Optical Frequency Shot-noise Suppression in Relativistic Electron-beams 35TUPLB06 Status of the Rare Isotope Science Project in Korea . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36TUPLB07 Reduced-beta Cavities for High-intensity Compact Accelerators . . . . . . . . . . . . . . . . . . . . 36TUPLB08 R&D Towards CW Ion Linacs at ANL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36TUPLB09 Design and Beam Test of Six-electrode BPMs for Second-order Moment Measurement . . . . . . . 36

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TUPLB10 Non-destructive, Shot-by-shot Real-time Monitor to Measure 3D Bunch Charge Distribution witha Femtosecond Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

TUPLB11 Waveguide System R&D for the ILC Klystron Cluster Scheme . . . . . . . . . . . . . . . . . . . . . . 36TUPLB12 Development of Permanent Magnet Focusing System for Klystrons . . . . . . . . . . . . . . . . . . 37

TUPB — Poster Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38WE1A — Invited Oral Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

WE1A01 ERL-Based Light Source Challenges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54WE1A02 Status and Future of the CLIC Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54WE1A03 Application of X-band Linacs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54WE1A04 The ARIEL Superconducting Electron Linac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54WE1A05 Linac-Based Laser Compton Scattering X-Ray and Gamma-Ray Sources . . . . . . . . . . . . . . . . 54

WE2A — Invited Oral Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55WE2A01 RF Power Production at the Two Beam Test Stand at CERN . . . . . . . . . . . . . . . . . . . . . . . . 55WE2A02 Solid State Marx Modulators for Emerging Applications - CLIC, ESS, ILC & Project X . . . . . . . . . 55WE2A03 High-Field Short-Period Microwave Undulators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

TH1A — Invited Oral Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56TH1A01 Results Achieved by the S1-Global Collaboration for ILC . . . . . . . . . . . . . . . . . . . . . . . . . . 56TH1A02 Compact Superconducting Crabbing and Deflecting Cavities . . . . . . . . . . . . . . . . . . . . . . . 56TH1A03 Superconducting RF Spoke Cavities for Electron and High-Velocity Proton Linacs . . . . . . . . . . . 56TH1A04 Superconducting Linac and Associated Developments at IUAC Delhi . . . . . . . . . . . . . . . . . . 56TH1A05 Emittance-partitioning Strategies for Future Accelerator Applications . . . . . . . . . . . . . . . . . . 56

TH2A — Invited Oral Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57TH2A01 Parameter Choice for the ESS Linac Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57TH2A02 SPIRAL2 Accelerator Construction Progress (GANIL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57TH2A03 Design, Construction and Commissioning of the Linac4 Accelerating Structures . . . . . . . . . . . 57

TH3A — Invited Oral Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58TH3A01 Status of ILC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58TH3A02 JLAB Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58TH3A03 ERL-Based Lepton-Hadron Colliders: ERHIC and LHeC . . . . . . . . . . . . . . . . . . . . . . . . . . 58TH3A04 Plasmas, Dielectrics and the Ultrafast: First Science and Operational Experience at FACET . . . . . 58

THPLB — Poster Orals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59THPLB01 Linac Construction for China Spallation Neutron Source . . . . . . . . . . . . . . . . . . . . . . . . . 59THPLB02 Performance of Ferrite Vector Modulator Control Loops in the LLRF System of the Fermilab HINS

6-Cavity Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59THPLB03 Front-End Linac Design and Beam Dynamics Simulations for MYRRHA . . . . . . . . . . . . . . . . 59THPLB04 Preliminary Study of Proton Beam Transport in a 10 MeV Dielectric Wall Accelerator . . . . . . . . 59THPLB05 R&D Activities on High Intensity Superconducting Proton Linac at RRCAT . . . . . . . . . . . . . . 59THPLB06 The New Option for a Front End of Ion Linac . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59THPLB07 Experience with a 4-Rod CW Radio Frequency Quadrupole . . . . . . . . . . . . . . . . . . . . . . . 60THPLB08 High-Power RF Conditioning of the TRASCO RFQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60THPLB09 Status of E-XFEL String and Cryomodule Assembly at CEA-Saclay . . . . . . . . . . . . . . . . . . . 60THPLB11 Experimental and Simulation Study of the Long-path-length Dynamics of a Space-charge-

dominated Bunch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60THPLB12 Photoinjector SRF Cavity Development for BERL inPro . . . . . . . . . . . . . . . . . . . . . . . . . . 60

THPB — Poster Session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61FR1A — Invited Oral Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

FR1A01 Heavy Ion Stripper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76FR1A02 Light Ion ECR Sources State of Art for Linacs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76FR1A03 Commissioning and Operation of the Californium Rare Ion Breeder Upgrade at the ATLAS facility . 76FR1A04 In Flight Ion Separation using a Linac Chain (TRIUMF) . . . . . . . . . . . . . . . . . . . . . . . . . . 76FR1A05 SARAF Phase 2 Linac Physical Design Study . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

FR2A — Invited Oral Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77FR2A01 Recovery of the J-PARC Linac from the Earthquake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77FR2A02 Antihydrogen Trapping and Probing at the Alpha-CERN Experiment . . . . . . . . . . . . . . . . . . 77

Author List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

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SUPB — Student Poster Session & Reception

01 Electron Accelerators and ApplicationsSUPB001 Contribution to Mid-field Q Slope in Niobium SRF Cavities from Linear RF Loss Mechanism due to Topo-

graphic Surface Structuress – C. Xu (The College of William and Mary)Topographic structures on Superconductivity Radio Frequency (SRF) surfaces can contribute to additional cav-ity RF loss in term of surface RF reflectivity and absorption index in wave scattering theory. At isotropic homo-geneous extent, Power Spectrum Density (PSD) is introduced and quantifies the random surface topographicroughness. PSD are compared on different surface treatments such Electropolishing (EP), Nano-MechanicalPolishing (NMP) and Barrel Centrifugal Polishing (CBP). A perturbation model is utilized to calculate roughsurface additional RF loss based on PSD statistical analysis. This model will not consider that superconduc-tor will become normal at field higher than transition field. Therefore, it is only expected to explain mid-fieldQ performance. One can calculate the RF power dissipation ratio between rough surface and ideal smoothsurface within this field range. Additionally, the resistivity of Nb is temperature and magnetic field dependentfrom classic thermal feedback model theory. Combining with topographic PSD analysis and Rs temperatureand field dependency, a middle field Q slope model could be modeled and the contribution from topographycan be simulated.

SUPB002 Analysis of Excitation in a Unique Dual-mode Accelerating Structure – L.R. Carver (UMAN), R.M. Jones(UMAN)A dual mode accelerating structure with reduced surface fields is potentially capable of sustaining 150 MV/m[1]. Here, we analyse the higher order modes of which the wakefield is composed in this unique structure.Means to suppress coherent excitation of the modes is considered by damping and detuning them.

SUPB003 Feasibility Study of Short Pulse Mode Operation for Multi-turn ERL Light Source – T. Atkinson (HZB),A.V. Bondarenko, A.N. Matveenko, Y. Petenev (HZB)The optics and simulation group at HZB are designing Germany’s future light source. Based on the emergingEnergy Recovery Linac super conducting technology, the Femto-Science-Factory (FSF) will provide its userswith ultra-bright photons of Angstrom wavelength at 6 GeV. The FSF is intended to be a multi-user facility andoffer a wide variety of operation modes. A low emittance ∼0.1 µm rad mode will operate in conjunction witha short-pulse ∼10 fs mode. This paper highlights the physical limitations when trying to offer interchangeablemodes and preserve beam high quality.

SUPB004 Linac Optics Design for Multi-turn ERL Light Source – Y. Petenev (HZB), T. Atkinson, A.V. Bondarenko,A.N. Matveenko (HZB)The optics simulation group at HZB is designing a multi-turn energy recovery linac-based light source. Usingthe superconducting Linac technology, the Femto-Science-Factory (FSF) will provide its users with ultra-brightphoton beams of angstrom wavelength at 6 GeV. The FSF is intended to be a multi-user facility and offer a vari-ety of operation modes. In this paper a design of transverse optic of the beam motion in the Linacs is presented.An important point in the optics design was minimization of the beta-functions in the linac at all beam passesto suppress beam break-up (BBU) instability.

SUPB005 Complete End To End Simulation in GPT – E. Danieli (Ariel University Center of Samaria, Faculty of Engineer-ing)A complete end to end simulation in GPT (general particle tracer) is presented of the beam line of an electro-static accelerator FEL, from the cathode to the collector. The current through the system is 2 A and electronsare accelerated to energies of 1.4 MeV, pulse duration duration during transport experiments is of the order of2 µs. The beam line is 13.5 m long, 4 focussing coils, 8 quadrupoles and 9 steering coils are positioned to guidethe beam as required. Comparison is made between the simulation results and experimental measurementsand differences explained.

SUPB006 Beam-based Alignment for the SXFEL – D. Gu (SINAP), Q. Gu, D. Huang, M. Zhang, M.H. Zhao (SINAP)In linear accelerators, dispersion caused by quadrupole misalignment and transverse wake-field effect causedby alignment errors of accelerate structures will lead to a significant emittance growth. There are more strin-gent restrictions on SXFEL, the traditional optical alignment can no longer meet its requirements, but theBeam-Based Alignment(BBA) method allows more precise alignment, further reduce the Linac errors to meetSXFEL requirements .In undulator sections, orbit changes are not only caused by misalignments of quadru-pole magnet position ,but also the errors of undulator magnetic. In order to achieve alignment accuracy overlonger distance, we measuring BPM data under different conditions and using SVD algorithm for calculationand analysis, we can get the quadrupole magnet errors and BPM offset. With the method above, software basedon MATLAB has been designed and compared the results with other software.

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SUPB007 On-line Dispersion-free Steering for the Main Linac of CLIC – J. Pfingstner (CERN), D. Schulte (CERN)For future linear colliders as well as for light sources, ground motion effects are a severe problem for the ac-celerator performance. After a few minutes, orbit feedback systems are not sufficient to mitigate all groundmotion effects and additional long term methods will have to be deployed. In this paper, the long term groundmotion effects in the main linac of the Compact Linear Collider (CLIC) are analysed via simulation studies. Theprimary growth of the projected emittance is identified to originate from chromatic dilutions due to dispersivebeam orbits. To counter this effect, an on-line identification algorithm is applied to measure the dispersionparasitically. This dispersion estimate is used to correct the beam orbit with an iterative dispersion free steer-ing algorithm. The presented results are not only of interest for the CLIC project, but for all linacs in which thedispersive orbit has to be corrected over time.

SUPB008 Specifications of the Distributed Timing System for the CLIC Main Linac – A. Gerbershagen (CERN), A. An-dersson, D. Schulte (CERN) P. Burrows, A. GerbershagenThe longitudinal phase stability of CLIC main and drive beams is a crucial element of CLIC design. In orderto measure and to control the phase, a distributed phase monitoring system has been proposed. The systemmeasures the beam phase every 900 m. The relative phase between the measurement points is synchronizedwith an external reference system via a chain of reference lines. This paper presents the simulations of errorpropagation in the proposed distributed monitoring system and the impact on the drive and main beam phaseerrors and the luminosity. Based on the results the error tolerances for the proposed system are detailed.

SUPB009 Linear Accelerator based on Parallel Coupled Accelerating Structure – A.E. Levichev (BINP SB RAS),A.M. Barnyakov, V.M. Pavlov (BINP SB RAS) Y.D. Chernousov (ICKC) V. Ivannikov, I.V. Shebolaev (ICKC SB RAS)Accelerating stand based on parallel coupled accelerating structure and electron gun is developed and pro-duced. The structure consists of five accelerating cavities. The RF power feeding of accelerating cavities isprovided by common exciting cavity which is performed from rectangular waveguide loaded by reactive pins.Operating frequency is 2450 MHz. Electron gun is made on the basis of RF triode. Linear accelerator was testedwith different working regimes. The obtained results are following: energy is up to 4 MeV, accelerating currentis up to 300 mA with pulse duration of 2.5 ns on the half of the width; energy is up to 2.5 MeV, acceleratingcurrent is up to 100 mA with pulse duration of 5 µs; energy is up to 2.5 MeV, accelerating current is up to 120mA with pulse duration of 5 µs and beam capture of 100%. The descriptions of the accelerator elements aregiven in the report. The features of the parallel coupled accelerating structure are discussed. The results of themeasuring accelerator’s parameters are presented.

SUPB010 Measurements of a Reduced Energy Spread of a Recirculating Linac by Non-isochronous Beam Dynamics –F. Hug (TU Darmstadt), C. Burandt, M. Konrad, N. Pietralla (TU Darmstadt) R. Eichhorn (Cornell University)The Superconducting Linear Accelerator S-DALINAC at the University of Darmstadt (Germany) is a recirculat-ing linac with two recirculations providing beams for measurements in nuclear physics at small momentumtransfers. For these experiments an energy spread of better than 10-4 (rms) is needed. Currently accelerationin the linac section is done on crest of the accelerating field. The recirculation path is operated achromaticand isochronous. In this recirculation scheme the energy spread of the resulting beam in the ideal case is de-termined by the electron bunch length. Taking into account the stability of the RF system the energy spreadincreases drastically to more than 10-3 (rms). We will present a new non-isochronous recirculation schemewhich helps cancelling out these errors from the rf-control. This scheme uses longitudinal dispersion in therecirculation paths and an acceleration off-crest with a certain phase with respect to the maximum. We willpresent results of the commissioning of the new system including measurements of the longitudinal dispersionin the recirculation arcs as well as measurements of the resulting energy spread using an electron spectrometer.

SUPB011 First Demonstration of Optical Frequency Shot-noise Suppression in Relativistic Electron-beams – A. Nause(University of Tel-Aviv, Faculty of Engineering), E. Dyunin, A. Gover (University of Tel-Aviv, Faculty of Engineer-ing)We report first demonstration of optical frequency current shot-noise suppression in a relativistic e-beam.This process is made possible by collective Coulomb interaction between the electrons of a cold intense beamduring beam drift, and is essentially a process of longitudinal beam-plasma oscillation [1]. Suppression ofbeam current noise below the classical “shot-noise” level has been known in the microwave tubes art [2]. Thisis the first time that it is demonstrated in the optical regime. We predict that the scheme can be extendedto the XUV and possibly to shorter wavelengths with further development of technology. The fundamentalcurrent shot-noise determines the level of incoherent spontaneous radiation emission from electron-beamoptical radiation sources and SASE-FELs [3]. Suppressing shot-noise would make it possible to attain sponta-neous emission sub-radiance [4] and surpass the classical coherence limits of seed-injected FELs. The effectwas demonstrated by measuring sub-linear growth as a function of current of the OTR Radiation. This findingindicates that the beam charge homogenizes due to the collective interaction, and its distribution becomessub-Poissonian.


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02 Proton and Ion Accelerators and ApplicationsSUPB012 Status of CH Cavity and Solenoid Design of the 17 MeV Injector for MYRRHA – D. Mäder (IAP), H. Klein,

H. Podlech, U. Ratzinger, C. Zhang (IAP)The multifunctional subcritical reactor MYRRHA (Multi-purpose hybrid research reactor for high-tech appli-cations) will be an accelerator driven system (ADS) located in Mol (Belgium). The first accelerating section upto 17 MeV is operated at 176 MHz and consists of a 4-Rod-RFQ followed by two room temperature CH cavitieswith integrated triplet lenses and four superconducting CH structures with intertank solenoids. Each roomtemperature CH cavity provides about 1 MV effective voltage gain using less than 30 kW of RF power. Thesuperconducing resonators have been optimized for electric peak fields below 30 MV/m and magnetic peakfields below 30 mT. For save operation of the superconducting resonators the magnetic field of the intertanksolenoids has to be less than 50 mT at the CH cavity walls. Different coil geometries have been compared tofind the ideal solenoid layout.

SUPB013 The Beam Commissioning Plan of Injector II in C-ADS – Z.J. Wang (IMP), Y. He, H. Jia, C. Li, S.H. Liu (IMP)The design work of the Injector II, which is 10 MeV proton linac, in C-ADS project is being finished and somekey elements are being fabricated. Now it is necessary to definite the operation mode of beam commissioning,including the selection of the beam current, pulse length and repetition frequency. Also the beam commis-sions plan should be specified. The beam commissions procedures is simulated with t-mode code GPT. In thispaper, the general beam commissioning plan of Injector II in CIADS and simulation results of commissionsprocedures are presented.

SUPB014 RF Setup of the MedAustron RFQ – B. Koubek (IAP), A. Schempp, J.S. Schmidt (IAP)A Radio Frequency Quadrupole (RFQ) was built for the injector of the cancer treatment facility MedAuston inAustria. The 216 MHz RFQ accelerates protons and carbon ions up to 400 keV with an electrode length of 1.25m. For the RF design simulations were performed using CST Microwave Studio. The simulations and the RFsetup of the delivered RFQ are presented in this paper.

SUPB015 Production and Quality Control of the First Modules of the IFMIF-EVEDA RFQ – F. Scantamburlo (INFN-Sez. di Padova), R. Dima, A. Pepato (INFN- Sez. di Padova)The IFMIF-EVEDA RFQ, designed to accelerate a 125 mA D+ beam from the initial energy of 0.1 MeV to thefinal energy of 5 MeV at the frequency of 175 MHz, consists of 18 mechanical modules whose length is approx-imately 54 cm each. The production of the modules has started and, in particular, the modules 16, 17, 15 and11, plus the prototype modules 1 and 2 have undergone all the production steps, including precision millingand brazing. In this article, the progress of the production, and the quality control during the phases of theproduction of the modules will be described.

SUPB016 RFQ With Improved Energy Gain – A. Kolomiets (ITEP) A.S. Plastun (MEPhI)RFQ structure is practically only one choice for using in front ends of ion linacs for acceleration up to energyabout 3 MeV. This limit is due to its relatively low acceleration efficiency. However it isn’t intrinsic feature ofRFQ principle. It is defined only by vane geometry of conventional RFQ structure with sinusoidal modulationof vanes. The paper presents results of analysis RFQ with modified vane geometries that allow to improveacceleration efficiency. RFQ with modified vanes was used for design second section of heavy ion injector ofTWAC for acceleration of ions with Z/A = 0.33 up to 7 MeV/u.

SUPB017 Tuning Studies on 4-rod-RFQs – J.S. Schmidt (IAP), B. Koubek, A. Schempp (IAP)A NI LabVIEW based Tuning Software has been developed to structure the tuning process of 4-rod-Radio Fre-quency Quadrupole s (RFQs) and its results are compared to measurement data of 4-rod-RFQs in differentfrequency ranges. For the optimization of RFQ design parameters, a certain voltage distribution along theelectrodes of an RFQ is assumed. Therefore an accurate tuning of the voltage distribution is very importantfor the beam dynamic properties of an RFQ. A variation can lead to particle losses and reduced beam qualityespecially with higher frequencies. Our electrode design usually implies a constant longitudinal voltage dis-tribution. For its adjustment tuning plates are used between the stems of the 4-rod-RFQ. These predictionsare based, in contrast to other simulations, on measurements, to define the characteristics of the RFQ as it wasbuild - not depending on assumptions of the design. This will lead to a totally new structured process of tuning4-rod-RFQs in a broad range of frequencies by using the predictions of a software. The results of these studiesare presented in this paper.

SUPB018 Studies of Parasitic Cavity Modes for Proposed ESS Linac Lattices – R. Ainsworth (Royal Holloway, Universityof London) S. Molloy (ESS)The European Spallation Source (ESS) planned for construction in Lund, Sweden, will be the worlds mostintense source of pulsed neutrons. The neutrons will be generated by the collision of a 2.5 GeV proton beamwith a heavy-metal target. The superconducting section of the proton linac is split into three different types ofcavities, and a question for the lattice designers is at which points in the beamline these splits should occur.This note studies various proposed designs for the ESS lattice from the point of view of the effect on the beamdynamics of the parasitic cavity modes lying close in frequency to the fundamental accelerating mode. Eachlinac design is characterised by the initial kinetic energy of the beam, as well as by the velocity of the beamat each of the points at which the cavity style changes. The scale of the phase-space disruption of the protonpulse is discussed, and some general conclusions for lattice designers are stated.


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SUPB019 The Multipacting Simulation for the New-shaped QWR using TRACK3P – C. Zhang (IMP)In order to improve the electro-magnetic performance of the quarter wave resonator, a new-shaped cavitywith an elliptical cylinder outer conductor has been proposed. This novel cavity design can provide muchlower peak surface magnetic field and much higher Ra/Q0 and G. The Multipacting simulation has been donefor this new QWR cavity using ACE3P/TRACK3P code, in this paper the simulation results will be presentedand analyzed.

SUPB020 Structural Analysis of the New-shaped QWR for HIAF in IMP – C. Zhang (IMP)Since the QWR cavity is very successful for the operation with frequency of 48 to 160 MHz and beta value of0.001 to 0.2, a new-shaped QWR is being designed for the low energy superconducting section of HIAF in theInstitute of Modern Physics. The cavity will work at 81.25 MHz and β of 0.085, with a elliptical cylinder outerconductor to better its electro-magnetic performance and keep limited accelerating space. Structural design isan important aspect of the overall cavity implementation, and in order to minimize the frequency shift of thecavity due to the helium bath pressure fluctuations, the Lorentz force and microphonic excitation, stiffeningelements have to be applied. In this paper, structural analyses of the new-shaped QWR are presented andstiffening methods are explored.

SUPB021 Design of the Elliptical Medium-beta Cavity for the ESS – G. Costanza (Lund University)The design of a five cell, medium-beta elliptical cavity for the ESS is presented. The ESS is the European Spal-lation Source, a neutron source that will allow the investigation of matter with a wide range of lengths andtime scales. The optimization process aimed at maximizing the R/Q, the geometrical factor G and the productR/Q*G of the fundamental mode, taking into account that the normalized peak surface fields, Bpk/Eacc andEpk/Eacc must be kept at an acceptable level. The design takes into consideration the Higher Order Modes(HOMs), thus an analysis of the HOMs is performed in order to determine the characteristics of the beamtubes, end cells, HOM couplers and the power delivered by the beam to the HOMs.

SUPB022 First Measurements on the 325 MHz Superconducting CH Cavity – M. Busch (IAP), M. Amberg, F.D. Dziuba,H. Podlech, U. Ratzinger (IAP)At the Institute for Applied Physics (IAP), Frankfurt University, a superconducting 325 MHz CH-Cavity hasbeen designed and built. This 7-cell cavity has a geometrical β of 0.16 corresponding to a beam energy of 11.4AMeV. The design gradient is 5 MV/m. Novel features of this resonator are a compact design, low peak fields,easy surface processing and power coupling. Furthermore a new tuning system based on bellow tuners insidethe resonator will control the frequency during operation. After successful rf tests in Frankfurt the cavity willbe tested with a 10 mA, 11.4 AMeV beam delivered by the GSI UNILAC. In this paper first measurements andcorresponding simulations will be presented.

SUPB023 Status of the Superconducting CW Demonstrator for GSI – F.D. Dziuba (IAP), M. Amberg, M. Busch,H. Podlech, U. Ratzinger, R. Tiede (IAP) K. Aulenbacher (IKP) W.A. Barth, S. Mickat (GSI)Since the existing UNILAC at GSI will be used as an injector for the FAIR facility a new, superconducting (sc)continous wave (cw) LINAC is highly requested by a broad community of future users to fulfil the requirementsof nuclear chemistry, especially in the research field of Super Heavy Elements (SHE). This LINAC is under de-sign in cooperation with the Institute for Applied Physics (IAP) of Frankfurt University, GSI, and the HelmholtzInstitut Mainz (HIM). It will consist of nine sc Crossbar-H-mode (CH) cavities operated at 217 MHz whichprovide an energy of up to 7.3 AMeV. Currently, a prototype of the cw LINAC is under development. This de-monstrator comprises the first sc CH cavity of the LINAC embedded between two sc solenoids mounted in ahorizontal cryomodule. One important milestone of the project will be a full performance test of the demon-strator by injecting and accelerating a beam from the GSI High Charge State Injector (HLI) in 2013/14. Thestatus of the demonstrator is presented.

03 TechnologySUPB024 Development of Permanent Magnet Focusing System for Klystrons – Y. Fuwa (Kyoto ICR), Y. Iwashita,

H. Tongu (Kyoto ICR) S. Fukuda, S. Michizono (KEK)The Distributed RF System (DRFS) for the International Linear Collider (ILC) requires thousands of klystrons.The failure rate of the power supply for solenoid focusing coil of each klystron may be a critical issue for aregular operation of the ILC. A permanent magnet beam focusing system can increase reliability and eliminatetheir power consumption. Since the required magnetic field is not high in this system, inexpensive anisotropicferrite magnets can be used instead of magnets containing rare earth materials. In order to prove its feasibility,a test model of a permanent magnet focusing beam system is constructed and a power test of the klystron forDRFS with this model is under preparation. The results of magnetic field distribution measurement and thepower test will be presented.

SUPB025 Development of Superconducting Radio-Frequency (SRF) Deflecting Mode Cavities and Associated Waveg-uide Dampers for the APS Upgrade Short Pulse X-Ray Project – J.P. Holzbauer (ANL), A. Nassiri, G.J. Wald-schmidt, G. Wu (ANL)The Advanced Photon Source Upgrade (APS-U) is a Department of Energy (DoE) funded project to increase theavailable x-ray beam brightness and add capability to enhance time-resolved experiments on few-ps-scale atAPS. A centerpiece of the upgrade is the generation of short pulse x-rays (SPXs) for pump-probe time-resolvedcapability using SRF deflecting cavities[1]. The SPX project is designed to produce 1-2 ps x-ray pulses for someusers compared to the standard 100 ps pulses currently produced. SPX calls for using superconducting rf (SRF)


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deflecting cavities to give the electrons a correlation between longitudinal position in the bunch and verticalmomentum [2]. The light produced by this bunch can be passed through a slit to produce a pulse of light muchshorter than the bunch length at reduced flux. The ongoing work of designing these cavities and associatedtechnologies will be presented. This includes the design and prototyping of higher-order (HOM) and lower-order mode (LOM) couplers and dampers as well as the fundamental power coupler (FPC). This work will begiven in the context of SPX0, a demonstration cryomodule with two deflecting cavities to be installed in APS inearly 2014.

SUPB026 Multipacting Analysis of High-velocity Superconducting Spoke Resonators – C.S. Hopper (ODU), J.R. Delayen(ODU)Some of the advantages of superconducting spoke cavities are currently being investigated for the high-velocityregime. When determining a final, optimized geometry, one must consider the possible limiting effects multi-pacting could have on the cavity. We report on the results of analytical calculations and numerical simulationsof multipacting electrons in superconducting spoke cavities and methods for reducing their impact.

SUPB027 Mechanical Study of the First Superconducting Half-wave Resonator for Injector II of CIADS Project – S. He(IMP), Y. He, S.C. Huang, R.X. Wang, Y.Z. Yang, W.M. Yue, C. Zhang, S.H. Zhang, S.X. Zhang, H.W. Zhao (IMP)G. Cheng, H. Wang (JLAB)Within the framework of the China Accelerator-Driven Sub-critical Systems (CIADS) project, Institute of Mod-ern Physics (IMP) Chinese Academic of Sciences has proposed a 162.5 MHz Half-Wave Resonator (HWR) Su-perconducting cavity for low energy section (β=0.09) of high power proton linear accelerators as a new in-jector II for CIADS. For the geometrical design of superconducting cavities structure mechanical simulationsare essential to predict mechanical eigenmodes and the deformation of the cavity walls due to bath pressureeffects and the cavity cool-down. Additionally, the tuning analysis has been investigated to control the fre-quency against microphonics and Lorentz force detuning. Therefore, several RF, static structure, thermal andmodal analysis with a three-dimensional Finite-Element Method (FEM) code Traditional ANSYS have beenperformed.

SUPB028 The Superconducting CH Cavity Development in IMP – M.X. Xu (IMP), Y. He (IMP)Superconducting CH cavity which with the feature of high accelerating gradient and mechanical rigidity, is anideal option to connect the low energy RFQ and the middle energy superconducting cavity. The supercon-ducting CH cavity had been chose a backup cavity type to accelerate proton from 2.1 MeV to 10 MeV for theADS of China in IMP. The following introduce the developing superconducting prototype 6 cell CH cavity withfrequency 162.5 MHz, β=0.067 in IMP, including the EM design and fabrication processing.

SUPB029 Impact of Trapped Magnetic Flux and Systematic Flux Expulsion in Superconducting Niobium – J.M. Vogt(HZB), J. Knobloch, O. Kugeler (HZB)The intrinsic quality factor Q0 of superconducting cavities is known to depend on various factors like niobiummaterial properties, treatment history and magnetic shielding. We already reported an additional impact oftemperature gradients during the cool-down on the obtained Q0. We believe cooling conditions can influencethe level of flux trapping and hence the residual resistance. For further studies we have constructed a test standusing niobium rods to study flux trapping. Here we can precisely control the temperature and approach Tc inthe superconducting state. Although the sample remains in the superconducting state a change in the amountof trapped flux is visible. The procedure can be applied repeatedly resulting in a significantly lowered level oftrapped flux in the sample. Applying a similar procedure to a superconducting cavity could allow for reductionof the magnetic contribution to the surface resistance and result in a significant improvement of Q0.

SUPB030 High Q Studies for Nb Cavities: Heat Treatments and NbN R&D at FNAL – A. Grassellino (Fermilab), D.J. Bice,A.C. Crawford, A. Romanenko, A.M. Rowe, M. Wong (Fermilab)The recent focus on SRF CW applications calls for R&D effort towards high quality factors of Nb resonators ataccelerating fields up to 20 MV/m. In this contribution we present the results of studies at Fermilab which aimat maximizing Q: these studies involve high T treatments in UHV and chemistry (HF rinsing) in the quest forthe ’best Q recipe’ at different field levels, operating T and frequency. Studies include also the formation of aniobium nitride layer via bulk diffusion, with different purposes:

• to create a capping layer to prevent hydrogen reabsorption,

• to create a layer of a different SC with higher critical T and critical fields, which can potentially lead tomuch lower surface resistance than Nb.

SUPB031 The Nonresonant Perturbation Theory Based Field Measurement and Tuning of Linac Accelerating Struc-ture – W. Fang (SINAP), Q. Gu, Z.T. Zhao (SINAP) D.C. Tong (TUB)Assisted by the bead pull technique, the nonresonant perturbation theory is applied for measuring and tuningthe field of the linac accelerating structure. The method is capable of making non-touch measurement, am-plitude and phase diagnostics, real time mismatch feedback and field tuning. Main considerations on mea-surement system and of C-band traveling-wave structure are described, the bead pull measurement and thetuning of the C-band traveling-wave linac accelerating structure are presented.


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SUPB032 C-band Pulse Compression and some Components for Shanghai Soft-XFEL – C.P. Wang (SINAP)A compact soft X-ray free electron laser facility is presently being constructed at shanghai institute of appliedphysics (SINAP), Chinese academy of science in 2012 and will be accomplished in 2014. This facility requiresa compact linac with a high-gradient accelerating structure for a limited overall length less than 230 m. Thec-band technology which is already used in KEK/Spring-8 linear accelerator is a good compromise for thiscompact facility and a c-and traveling-wave accelerating structure was already fabricated and tested at SINAP,so a c-band pulse compression will be required. AND a SLED type RF compression scheme is proposed forthe C-band RF system of the soft XFEL and this scheme uses TE0.1.15 mode energy storage cavity for high Q-energy storage. The C-band pulse compression under development at SINAP has a high power gain about 3.1and it is designed to compress the pulse width from 2.5 µs to 0.5 µs and multiply the input RF power of 50 MWto generate 160 MW peak RF power, and the coupling coefficient will be 8.5. It has three components: 3 dBcoupler, mode convertors and the resonant cavities.

SUPB033 CST Modeling of Key Elements of a Resonator for an Electrostatic FEL – H. S. Marks (University of Tel-Aviv,Faculty of Engineering)Results of modeling in CST of a W-band (75-110 GHz) corrugated waveguide and Confocal Splitter currentlywithin the wiggler of an electrostatic accelerator free electron laser are presented together with experimentalS-parameter measurements made of the device. The Confocal Splitter is a component of an FEL resonatorfor decoupling the radiative power that is generated in the resonator from the electron beam in traversing thewiggler, without the need to deflect the electron beam. The power out of the resonator is controlled by a 3 gridsystem. The wires of the first and third grid are fixed vertically, whilst the centre grid can be rotated using amotor, thus varying the transmission and reflectivity of the resonator.

04 Extreme Beams, Sources and Other TechnologiesSUPB034 Progress of MICE, the International Muon Ionization Cooling Experiment – D. Rajaram (Illinois Institute of

Technology)Ionization Cooling is the only practical solution to preparing high brilliance muon beams for a neutrino factoryor muon collider. The muon ionization cooling experiment (MICE) is under development at the RutherfordAppleton Laboratory (UK) by an international collaboration. The muon beam line has been commissionedand, for the first time, measurements of beam emittance with particle physics detectors have been performed.The remaining apparatus is currently under construction. First results with a liquid-hydrogen absorber willbe produced in 2013; a couple of years later a full cell of a representative ionization cooling channel, includ-ing RF re-acceleration, will be in operation. The design offers opportunities to observe cooling with variousabsorbers and several optics configurations. Results will be compared with detailed simulations of coolingchannel performance to ensure full understanding of the cooling process.

SUPB035 RF Photoinjector and Radiating Structure for High-power THz Radiation Source – S.M. Polozov (MEPhI),T.V. Bondarenko (MEPhI) Y.A. Bashmakov (LPI)Sources of high-power electromagnetic radiation in THz band are becoming promising as a new method of alow activation introscopy. Research and development of accelerating RF photoinjector and radiating systemfor THz radiation source are reported. The photoinjector is based on disk loaded waveguide (DLW). Two differ-ent designs of accelerating structures were modeled: widespread 1.6 cell of DLW structure and travelling waveresonator structure. The resonant models of these structures and the structures with power ports were de-signed. Electrodynamics characteristics and electric field distribution for all models were acquired. Results ofpicoseconds photoelectron beam dynamics in modeled structures are reported. Design of decelerating struc-tures exciting Cherenkov radiation are based on corrugated metal channel and metal channel coated withdielectric. Analysis of radiation intensity and frequency band are presented.

SUPB036 The Development of EPICS Driver for High Voltage Supplies System – J.N. Bai (IHEP), F. Li, W. Pan, J.M. Tian,L. Zeng (IHEP)The Iseg-VHQ 204L with option M-h is chosen as high voltage supply for sensors of the BLM of the CSNSproject. An EPICS driver for this device has been developed. The High voltage supply system more than satis-fies the request after examination. In the future, it will be used in the running machine. In this paper the EPICSdriver and the Control Interface for the VHQ 204L will be presented.

SUPB037 The Development of Timing Control System for 3.5 MeV RFQ – J.N. Bai (IHEP), S. Xiao, T.G. Xu, L. Zeng (IHEP)A Timing control system based on VME configuration is developed to meet the need of 3.5 MeV RFQ. An EPICSdriver is provided to control its work. The timing control system satisfies request after examination. In thefuture, it will be used in the machine running. This paper introduces the Timing control hardware, VME inter-face, EPICS driver for Timing control system and MEDM operator interface.


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SUPB038 Multipole Field Effects for the Superconducting Parallel-bar Deflecting/Crabbing Cavities – S.U. De Silva(ODU), J.R. Delayen (ODU) S.U. De SilvaThe superconducting parallel-bar deflecting/crabbing cavity is currently being considered as one of the designoptions in rf separation for the Jefferson Lab 12 GeV upgrade and for the crabbing cavity for the proposed LHCluminosity upgrade. Knowledge of multipole field effects is important for accurate beam dynamics study of rfstructures. The multipole components can be accurately determined numerically using the electromagneticsurface field data in the rf structure. This paper discusses the detailed analysis of those components for thefundamental deflecting/crabbing mode and higher order modes in the parallel-bar deflecting/crabbing cavity.

03 TechnologySUPB039 Compact Superconducting Crabbing and Deflecting Cavities – S.U. De Silva (ODU) S.U. De Silva

Recently, new geometries for superconducting crabbing and deflecting cavities have been developed that havesignificantly improved properties over those the standard TM110 cavities. They are smaller, have low sur-face fields, high shunt impedance and, more importantly for some of them, no lower-order-mode with a well-separated fundamental mode. This talk will present the status of the development of these cavities.


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10-Sep-12 09:30 – 10:50 Invited Oral Hall A

MO1A — Opening Session Monday MorningChair: I. Mardor (Soreq NRC)

02 Proton and Ion Accelerators and ApplicationsMO1A01

09:30Operational Experience and Future Goals of the SARAF Linac at SOREQ – D. Berkovits (Soreq NRC), A. Aren-shtam, Y. Ben Aliz, Y. Buzaglo, O. Dudovich, Y. Eisen, I. Eliyahu, G. Feinberg, I. Fishman, I. Gavish, I.G. Gertz,A. Grin, S. Halfon, D. Har-Even, Y.F. Haruvy, T. Hirsch, D. Hirschmann, Z. Horvitz, B. Kaizer, D. Kijel, A. Kreisel,G. Lempert, J. Luner, A. Perry, E. Reinfeld, J. Rodnizki, G. Shimel, A. Shor, I. Silverman, L. Weissman, E. Zemach(Soreq NRC)SARAF-phase 1 at SOREQ, with its single 6 half-wave resonators cryomodule, is the first high current, super-conducting low-beta linac in operation and it is presently delivering cw proton beams in the mA range. A phase2 is foreseen for this linac which will allow acceleration up to 40 MeV of 2 mA cw proton and deuteron beams.The project status, the operational experience and the future goals of SARAF should be described.

01 Electron Accelerators and ApplicationsMO1A02

10:00Status of the European XFEL – Constructing the 17.5 GeV Superconducting Linear Accelerator – W. Decking(DESY)The European XFEL is presently under construction in Hamburg, Germany. It consists of a 1.2 km long super-conducting linac serving an about 3 km long electron beam transport system. Three undulator systems of upto 200 m length each produce hard and soft x-rays via the self-amplified spontaneous emission (SASE) process.We will present the status of the civil construction and the accelerator components. The production of the 100superconducting accelerator modules is distributed between industries and a collaboration of accelerator lab-oratories. We describe the carefully orchestrated production sequence, quality assurance measures and riskmitigation mechanisms. The last module is scheduled to be installed in the accelerator in spring 2015 andcommissioning with beam will start in summer of that year.

03 TechnologyMO1A03

10:30SRF Linac Technology Development at Fermilab – V.P. Yakovlev (Fermilab)Superconducting linear accelerators are developing for different applications – for fundamental researchesin High-Energy and High – Intensity Frontiers, nuclear physics, energetics, neutron spallation sources, syn-chrotron radiation sources, etc. The linac applications dictate the requirements for superconducting acceler-ation system, and, thus, for SRF technology. Fermilab is currently involved in two projects: ILC and ProjectX, both are based on SRF technology. For High-Intensity Frontier investigations, the Project X – a multi-experiment facility is developing based on 3 GeV, CW H- linac in the frame of a wide collaboration of US Na-tional Laboratories. In a CW H- linac several families of SC cavities are used: half-wave resonators (162.5 MHz);single-spoke cavities, SSR1 and SSR2 (325 MHz); elliptical 5-cellβ=0.6 andβ=0.9 cavities (650 MHz). Pulsed 3-8GeV linac and ILC linac are based on 9-cell 1.3 GHz cavities. In the paper the basic requirements and the statusof development of SC accelerating cavities, auxiliaries (couplers, tuners, etc.) and cryomodules are presentedas well as technology challenges caused by their specifics.


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MO2A — Invited Oral PresentationsChair: L. Groening (GSI)

04 Extreme Beams, Sources and Other TechnologiesMO2A01

11:20Recent Achievements on Laser Plasma Accelerators – V. Malka (LOA)Significant breakthroughs on laser plasma accelerators have been obtained these last few years. I will showthe incredible evolution of this field of research which has, in record time, allowed us to produce high qualityelectron beams in the GeV energy range using compact laser systems. I will show the scientific path that led usto produce stable, high peak current and high quality electron beams with a fine control of the charge, of therelative energy spread, and of the electron energy. In conclusion I will explain why these beams are of interestin the near future for medicine and material science, in the mid term future for the development of compactfree electron lasers, and for long term purpose for the development of accelerators for high energy physics.


11:50Increased Understanding of Beam Losses from the SNS Proton Linac Experiment – J. Galambos (ORNL)The SNS Linac has been in operation for 6 years, with its power being gradually increased. A major operationgoal is the decrease of beam loss. It has been recently suggested that intra- H–beam stripping contributessignificantly to beam losses in an H- linac. This was tested experimentally at SNS by accelerating a protonbeam. Experimental analysis results are in good agreement with the theoretical estimates. In this paper wepresent the operational status and experience at the SNS linac, with emphasis on understanding beam loss interms of intra-H–beam stripping.


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MO3A — Invited Oral PresentationsChair: M. Popovic (Fermilab)


13:30Development of H-mode Cavities Linacs for the FAIR Project – G. Clemente (GSI), W.A. Barth, L. Groening,S. Mickat, B. Schlitt, W. Vinzenz (GSI) R. M. Brodhage, F.D. Dziuba, H. Podlech, U. Ratzinger (IAP)H-mode cavities offer outstanding shunt impedances at low beam energies and enable the acceleration ofintense ion beams. Crossed-bar H-cavities extend these properties to energies even beyond 100 MeV. Thus,the designs of the new injector linacs for FAIR, i.e. a 70 MeV, 70 mA proton driver for pbar-production and a cwintermediate mass, superconducting ion linac are based on these novel cavities. Several prototypes (normal &super-conducting) have been built and successfully tested. Moreover, designs for a replacement of the 80 MVAlvarez section of the GSI - Unilac will be discussed to improve the capabilities as the future FAIR heavy ioninjector.

MO3A0213:50

Commissioning of a New Injector for the RIKEN RI-Beam Factory – N. Sakamoto (RIKEN Nishina Center),Y. Higurashi, O. Kamigaito, H. Okuno, K. Suda, K. Yamada (RIKEN Nishina Center)A new injector for the RIKEN RI-Beam Factory (RIBF) has been fully commissioned since October 2011. Theinjector accelerates ions of m/q=6.8 up to 670 keV/u. In order to save the cost and space, a direct couplingscheme was adopted for rf coupling between the cavity and amplifier, based on an elaborate design with theMicrowave Studio code. It has worked out very stably in these three months, making the uranium beam inten-sity higher by one order of magnitude. Moreover, it is now possible to operate the RIBF and GARIS facility forthe super-heavy element synthesis independently.

MO3A0314:10

FRANZ – Accelerator Test Bench and Neutron Source – O. Meusel (IAP)The challenge of existing and planned neutron sources is to provide highly brilliant ion beams with high re-liability. The Frankfurt neutron source FRANZ is not only a neutron source but also a test bench for novelaccelerator and diagnostic concepts for intense ion beams. The experiment consists of a compact linear ac-celerator test bench for the acceleration of an intense proton beam to 2 MeV producing the neutrons via the7Li(p,n) reaction. The final beam intensity will be 200 mA, therefore the space charge and space charge com-pensation effects can be studied with high statistical relevance along the accelerator. The low energy beamtransport LEBT is equipped with four solenoids matching the beam into the chopper system and into the RFQ-IH combination already under construction. The coupling of the RFQ accelerator stage and the IH drift tubecavity offers the possibility to use only one power amplifier as a driver for both of these resonators and reducesinvestment costs. The compact design of this low-β accelerator stage is optimized for high beam intensities toovercome the strong space charge forces expected in this accelerator test bench.

04 Extreme Beams, Sources and Other TechnologiesMO3A04

14:30Accelerator/Decelerator of Slow Neutrons – M. Kitaguchi (Kyoto University, Research Reactor Institute) Y. Ari-moto, H.M. Shimizu (KEK) Y. Iwashita (Kyoto ICR) T. Yoshioka (Kyushu University)An accelerator/decelerator for slow neutron beams has been demonstrated. The energy of a neutron can beincreased or decreased by flipping the neutron spin (directly coupled to magnetic dipole moment) in mag-netic field. This device is a combination of a gradient magnetic field and an RF magnetic field. Because theRF frequency for the spin flip is a function of the external magnetic field, only neutrons that are located in aspecific magnetic field level will be spin-flipped at a given RF frequency. By changing the RF frequency, theenergy change can be selected in the gradient magnetic field. The maximum field of the gradient magnet is 1T, which corresponds to the energy change of 120 neV. The magnetic field linearly decreases to 0.2T within 25cm. By putting this device on a beamline from a pulsed neutron source, neutron rebuncher is realized. Thedense slow neutrons are important to suppress the systematic errors for the measurement of neutron electricdipole moment (nEDM). The combination of spallation neutron source and this neutron rebuncher is suitableto the measurement of nEDM. A review of current status of our plan for nEDM experiment at J-PARC will bealso presented.


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10-Sep-12 14:50 – 15:50 Oral Hall B

MOPLB — Poster Orals

01 Electron Accelerators and ApplicationsMOPLB01

14:50Emittance Control for Different FACET Beam Setups in the SLAC Linac – F.-J. Decker (SLAC), N. Lipkowitz,J. Sheppard, G.R. White, U. Wienands, M. Woodley, G. Yocky (SLAC)The linac beam at SLAC requires different setups for different users at FACET (Facility for Advanced aCcelera-tor Experimental Tests) area, like highly compressed, intense bunches, or lower charge, long bunches. Theserequire typically a lengthy tuning effort since with a energy-time correlation ("chirp") bunch transverse wake-field kicks can be compensated with dispersive trajectory oscillations and vice versa. Lowering the charge orchanging the bunch length will destroy this delicate balance. Besides the typical steering to minimize BPMs(Beam Position Monitors) with correctors, we applied different techniques to try to localize beam disturbanceslike dispersion with phase changes, RF-kicks and RF quadrupole fields turning a klystron off and on, or vary-ing the phase, and finally wakefield kicks with different beam intensities. It is also important to quantify BPMto quadrupole offsets with "bow-tie" plot and that the correctors give the expected kicks with orbit responsematrix measurements.

MOPLB0214:55

Positron Injector Linac Upgrade for SuperKEKB – T. Kamitani (KEK)The KEKB B-factory is under an upgrade construction for the SuperKEKB. To achieve 40 times higher lumi-nosity, the linac is required to inject electrons and positrons with higher intensities (e-: 1 nC −→ 5 nC, e+: 1nC −→ 4 nC) and lower emittances (e-: 300 −→ 20 µm, e+: 2100 −→ 10 µm). This paper describes the up-grade scheme of the positron source. A new positron capture section will have larger transverse and energyacceptances by introducing a flux concentrator and large aperture L-band and S-band accelerating structures.Beam line layout and quadrupole focusing system will be rearranged for the enlarged beam acceptance. Beamoptics is designed to be compatible for positron and electron beams with different energies and emittances.Pulsed quadrupoles and steering magnets are added for better flexibility in optics and orbit tuning. Parameteroptimization of the positron source by optics calculation and particle tracking simulation is described.

MOPLB0315:00

Advances in Beam Tests of Dielectric-based Accelerating Structures – A. Kanareykin (Euclid TechLabs, LLC),S.P. Antipov, C.-J. Jing (Euclid TechLabs, LLC) W. Gai (ANL)Diamond is being evaluated as a dielectric material for dielectric loaded accelerating structures. It has a verylow microwave loss tangent, high thermal conductivity, and supports high RF breakdown fields. We reporton progress in our recent beam tests of the diamond based accelerating structures of the Ka-band and THzfrequency ranges. Wakefield breakdown test of a diamond-loaded accelerating structure has been carried outat the ANL/AWA accelerator. The high charge beam from the AWA linac (∼70 nC, σz = 2.5 mm) was passedthrough a rectangular diamond loaded resonator and induce an intense wakefield. A groove is cut on thediamond to enhance the field. Electric fields up to 0.3 GV/m has been detected on the diamond surface toattempt to initiate breakdown. A surface analysis of the diamond has been performed before and after thebeam test. Wakefield effects in a 250 GHz planar diamond accelerating structure has been observed at BNL/ATF accelerator as well. We have directly measured the mm-wave wake fields induced by subpicosecond,intense relativistic electron bunches in a diamond loaded accelerating structure via the dielectric wake-fieldacceleration mechanism.

MOPLB0415:05

A 10 MeV L-band Linac for Irradiation Applications in China – G. Pei (IHEP), Y.L. Chi (IHEP)The electron linear accelerator has wide applications, and the demands are keeping growing for the irradiationapplications in China. A high beam power 10 MeV L-band Linac has been developed recently as a joint ventureof Institute of High Energy Physics and EL-PONT Company. The Thales TH2104U klystron, 3 A thermionicelectron gun and three meter L-band disk-loaded constant impedance RF structure are adopted. A stableelectron beam of 10 MeV, 40 kW has been obtained in the last May with a microwave to beam efficiency ofabout 65%. In this paper we will present the detailed design issues and beam commissioning.

MOPLB0515:10

Applications of Compact Dielectric Based Accelerators – C.-J. Jing (Euclid TechLabs, LLC), S.P. Antipov, A. Ka-nareykin, P. Schoessow (Euclid TechLabs, LLC) M.E. Conde (ANL)Important progress on the development of dielectric based accelerators has been made experimentally andtheoretically in the past few years. One advantage of dielectric accelerators over the metallic counterparts isits compact size, which may attract some applications in industrial or medical accelerators. In this article, wediscuss the design and technologies of dielectric based accelerators toward these needs.


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03 TechnologyMOPLB06

15:15Fermilab 1.3 GHz Superconducting RF Cavity and Cryomodule Program for Future Linacs – C.M. Ginsburg(Fermilab)The proposed Project X accelerator and the International Linear Collider are based on superconducting RFtechnology. As a critical part of this effort, Fermilab has developed an extensive program in 1.3 GHz SRF cavityand cryomodule development. This program includes cavity inspection, surface processing, clean assembly,low-power bare cavity tests and pulsed high-power dressed cavity tests. Well performing cavities have beenassembled into cryomodules for pulsed high-power tests and will be tested with beam. In addition, peripheralhardware such as tuners and couplers are under development. The current status and accomplishments ofthe Fermilab 1.3 GHz activity will be described, as well as the R&D program to extend the existing SRF pulsedoperational experience into the CW regime.

MOPLB0715:20

Non-destructive Inspections for SC Cavities – Y. Iwashita (Kyoto ICR), Y. Fuwa, M. Hashida, K. Otani, S. Sa-kabe, S. Tokita, H. Tongu (Kyoto ICR) H. Hayano, K. Watanabe, Y. Yamamoto (KEK)Non-destructive Inspections play important roles to improve yield in production of high-performance SC Cavi-ties. Starting from the high-resolution camera for inspection of the cavity inner surface, high resolution T-map,X-map and eddy current scanner have been developed. We are also investigating radiography to detect smallvoids inside the Nb EBW seam, where the target resolution is 0.1 mm. We are carrying out radiography testswith X-rays induced from an ultra short pulse intense laser. Recent progress will be presented.

MOPLB0815:25

Normal Conducting Deflecting Cavity Development at the Cockcroft Institute – G. Burt (Cockcroft Institute,Lancaster University), P.K. Ambattu, A.C. Dexter (Cockcroft Institute, Lancaster University) S.R. Buckley, P. Goud-ket, C. Hill, P.A. McIntosh, A.E. Wheelhouse (STFC/DL/ASTeC) R.M. Jones (UMAN)Two normal conducting deflecting structures are currently being developed at the Cockcroft Institute, one as acrab cavity for CLIC and one for bunch slice diagnostics on low energy electron beams for EBTF at Daresbury.Each has its own challenges that need overcome. For CLIC the phase and amplitude tolerances are very strin-gent and hence beamloading effects and wakefields must be minimised. Significant work has been undertookto understand the effect of the couplers on beamloading and the effect of the couplers on the wakefields. ForEBTF the difficulty is avoiding the large beam offset caused by the cavities internal deflecting voltage at the lowbeam energy. Propotypes for both cavities have been manufactured and results will be presented.

MOPLB0915:25

Status of the C-Band RF System for the SPARC-LAB High Brightness Photoinjector – R. Boni (INFN/LNF),D. Alesini, M. Bellaveglia, G. Di Pirro, M. Ferrario, A. Gallo, B. Spataro (INFN/LNF) A. Mostacci, L. Palumbo(URLS)The high brightness photoinjector in operation at the SPARC-LAB facility of the INFN-LNF, Italy, consists of a150 MeV S-band electron accelerator aiming to explore the physics of low emittance high peak current electronbeams and the related technology. Velocity bunching techniques, SASE and Seeded FEL experiments havebeen carried out successfully. To increase the beam energy and improve the performances of the experiments,it was decided to replace one S-band travelling wave accelerating cavity, with two C-band cavities that allow toreach higher energy gain per meter. The new C-band system is in a well advanced development phase and willbe in operation early in 2013. The main technical issues of the C-band system and the R&D activities carriedout till now are illustrated in detail in this paper.

MOPLB1015:35

FRIB Technology Demonstration Cryomodule Test – J. Popielarski (FRIB), E.C. Bernard, A. Fila, L.L. Harle,M. Hodek, L. Hodges, S. Jones, D. Morris, K. Saito, N.R. Usher, J. Weisend, J. Wlodarczak (FRIB) A. Facco (INFN/LNL) M. Klaus (Technische Universität Dresden)A Technology Demonstration Cryomodule (TDCM) has been developed for a systems test of technology beingdeveloped for FRIB. The TDCM consists of two half wave resonators (HWRs) which have been designed foran optimum velocity of β=v/c=0.53 and a resonant frequency of 322 MHz. The resonators operate at 2 K. Asuperconducting 9 T solenoid is placed in close proximity to one of the installed HWRs. The 9 T solenoidoperates at 4 K. A complete systems test of the cavities, magnets, and all ancillary components is presented inthis paper.


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04 Extreme Beams, Sources and Other TechnologiesMOPLB11

15:40The Upgraded Argonne Wakefield Accelerator Facility (AWA): a Test-Bed for the Development of High Gradi-ent Accelerating Structures and Wakefield Measurements – M.E. Conde (ANL), D.S. Doran, W. Gai, R. Konecny,W. Liu, J.G. Power, Z.M. Yusof (ANL) S.P. Antipov, C.-J. Jing (Euclid TechLabs, LLC) E.E. Wisniewski (Illinois Insti-tute of Technology)Electron beam driven wakefield acceleration is a bona fide path to reach high gradient acceleration of elec-trons and positrons. With the goal of demonstrating the feasibility of this concept with realistic parameters,well beyond a proof-of-principle scenario, the AWA Facility is currently undergoing a major upgrade that willenable it to achieve accelerating gradients of hundreds of MV/m and energy gains on the order of 100 MeV perstructure. A key aspect of the studies and experiments carried out at the AWA facility is the use of relativelyshort RF pulses (15 – 25 ns), which is believed to mitigate the risk of breakdown and structure damage. Theupgraded facility will utilize long trains of high charge electron bunches to drive wakefields in the microwaverange of frequencies (8 to 26 GHz), generating RF pulses with GW power levels.

MOPLB1215:45

Local Energy Spectrum Measurement on Tsinghua Thomson Scattering X-ray Source – Y.-C. Du (TUB),Hua„J.F. Hua, W.-H. Huang, C.-X. Tang, L.X. Yan, Z. Zhang (TUB)Thomson scattering X-ray source, in which the TW laser pulse is scattered by the relativistic electron beam, canprovide ultra short, monochromatic, high flux, tunable polarized hard X-ray pulse which is can widely used inphysical, chemical and biological process research, ultra-fast phase contrast imaging, and so on. Since thepulse duration of X-ray is as short as picosecond and the flux in one pulse is high, it is difficult to measure thex-ray spectrum. In this paper, we present the X-ray spectrum measurement experiment on Tsinghua Thomsonscattering. The preliminary experimental results shows the maximum X-ray energy is about 47 keV, which isagree well with the simulations.


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10-Sep-12 15:50 – 17:50 Poster Hall B

MOPB — Poster Session

01 Electron Accelerators and ApplicationsMOPB001 Emittance Control for Different FACET Beam Setups in the SLAC Linac – F.-J. Decker (SLAC), N. Lipkowitz,

J. Sheppard, G.R. White, U. Wienands, M. Woodley, G. Yocky (SLAC)The linac beam at SLAC requires different setups for different users at FACET (Facility for Advanced aCcelera-tor Experimental Tests) area, like highly compressed, intense bunches, or lower charge, long bunches. Theserequire typically a lengthy tuning effort since with a energy-time correlation ("chirp") bunch transverse wake-field kicks can be compensated with dispersive trajectory oscillations and vice versa. Lowering the charge orchanging the bunch length will destroy this delicate balance. Besides the typical steering to minimize BPMs(Beam Position Monitors) with correctors, we applied different techniques to try to localize beam disturbanceslike dispersion with phase changes, RF-kicks and RF quadrupole fields turning a klystron off and on, or vary-ing the phase, and finally wakefield kicks with different beam intensities. It is also important to quantify BPMto quadrupole offsets with "bow-tie" plot and that the correctors give the expected kicks with orbit responsematrix measurements.

MOPB002 Positron Injector Linac Upgrade for SuperKEKB – T. Kamitani (KEK)The KEKB B-factory is under an upgrade construction for the SuperKEKB. To achieve 40 times higher lumi-nosity, the linac is required to inject electrons and positrons with higher intensities (e-: 1 nC −→ 5 nC, e+: 1nC −→ 4 nC) and lower emittances (e-: 300 −→ 20 µm, e+: 2100 −→ 10 µm). This paper describes the up-grade scheme of the positron source. A new positron capture section will have larger transverse and energyacceptances by introducing a flux concentrator and large aperture L-band and S-band accelerating structures.Beam line layout and quadrupole focusing system will be rearranged for the enlarged beam acceptance. Beamoptics is designed to be compatible for positron and electron beams with different energies and emittances.Pulsed quadrupoles and steering magnets are added for better flexibility in optics and orbit tuning. Parameteroptimization of the positron source by optics calculation and particle tracking simulation is described.

MOPB003 Recent improvements to the Control of the CTF3 High-current Drive Beam – B. Constance (CERN), R. Corsini,P. Skowronski (CERN)In order to demonstrate the feasibility of the CLIC multi-TeV linear collider option, the drive beam complexat the CLIC Test Facility (CTF3) at CERN is providing high-current electron pulses for a number of related ex-periments. By means of a system of electron pulse compression and bunch frequency multiplication, a fullyloaded, 120 MeV linac is used to generate 140 ns electron pulses of around 30 Amperes. Subsequent decel-eration of this high-current drive beam demonstrates principles behind the CLIC acceleration scheme, andproduces 12 GHz RF power for experimental purposes. As the facility has progressed toward routine opera-tion, a number of studies aimed at improving the drive beam performance have been carried out. Additionalfeedbacks, automated steering programs, and improved control of optics and dispersion have contributed toa more stable, reproducible drive beam with consequent benefits for the experiments.

MOPB004 Design and Operation of a Compact 1 MeV X-band Linac – G. Burt (Cockcroft Institute, Lancaster University),P.K. Ambattu (Cockcroft Institute, Lancaster University) P.A. Corlett, A.R. Goulden, P.A. McIntosh, K.J. Middle-man, R.J. Smith (STFC/DL/ASTeC) C.J. White (STFC/DL)A compact 1 MeV linac has been produced at the Cockcroft Institute using X-band RF technology. The linac ispowered by a high power X-band magnetron and has a 17 keV 200 mA thermionic gun with a focus electrodefor pulsing. A bi-periodic structure with on-axis coupling is used to minimise the radial size of the linac and toreduce the surface electric fields.

MOPB005 High-gradient Operation of an 8 GeV C-band Accelerator in SACLA – T. Inagaki (RIKEN SPring-8 Center),C. Kondo, Y. Otake, T. Sakurai (RIKEN SPring-8 Center)SACLA (SPring-8 angstrom compact free electron laser) is the X-ray free electron laser (XFEL) facility. In orderto shorten the 8 GeV accelerator length, a C-band (5712 MHz) accelerator was employed. Since the accelerat-ing gradient of C-band accelerating structure is 35 MV/m in nominal, the active accelerator length is 230 m. Intotal, 64 klystrons, 64 pulse compressors, and 128 accelerating structures are used. In order to withstand thehigh surface field (∼ 100 MV/m), and to reduce the amount of dark current, which decreases the demagnetiza-tion effect of undulators, the accelerating structures are carefully fabricated in the factory. After high power RFconditioning of 500 hours, the beam commissioning was started in February 2011. For night time of the com-missioning, we continued the RF conditioning. The RF breakdown rate of the structure was steadily decreased.Now we operate the accelerator with the beam energy as much as 8.3 GeV, and the accelerating gradient of 37MV/m in average. We found the amount of dark current is small enough. So far no trouble occurred in C-bandRF components of 64 sets.

MOPB006 Design and Fabrication Status of 100 MeV/100 kW Electron Linear Accelerator for the NSC KIPT NeutronSource – Y.L. Chi (IHEP), S. Pei (IHEP) M.Y.A. Gohar (ANL) I.M. Karnaukhov, A.Y. Zelinsky (NSC/KIPT)In NSC KIPT, Kharkov, Ukraine, a neutron source based on a subcritical assembly driven by a 100 MeV/100 kWelectron linac is being constructed. This neutron source is an ANL (Argonne National Laboratory, USA) andNSC KIPT Joint project, and its linac is being designed and constructed by IHEP, P. R. China. Construction andmanufacture of the linear accelerator of such high beam intensity is a challenging task. In the report the projectof the electron linear accelerator of the required beam energy and intensity is described. Recently, the injector


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part has been fabricated and is being installed in the IHEP, and will be commissioned to determine whether thechopper system can work well or not. In the meantime, BBU effect and beam loading compensation systemin the injector will be checked / tested and compared with theoretical studies. This paper will present theprogress of the linear accelerator.

MOPB007 Study of Microbunching Instabilitity in the Linac of the Shanghai Soft X-ray Free Electron Laser Facility –D. Huang (SINAP), Q. Gu, M. Zhang (SINAP)The microbunching instability in the LINAC of a FEL facility has always been an issue which may degrade thequality of the electron beam. As the result, the whole facility may not be working properly. Shanghai soft X-ray FEL project (SXFEL), which is planned to start construction by the end of 2012, will be the first X-ray FELfacility in China. In this article, detailed study will be given based on the physical design of the facility to gainbetter understanding and control over the possible microbunching instability in SXFEL, which is critical to thesuccess of the project. Moreover, the contribution of the possible plasma effects to the instability will also bestudied by modifying the physical model of the longitudinal space charge (LSC) impedance.

MOPB008 Design and First Results of a Multi-pulsed LIA Injector – L.S. Xia (CAEP/IFP), J. Deng, Y. Shen, J. Shi,W.D. Wang, L. Wen, A.M. Yang, H. Zhang, K. Zhang, L.W. Zhang (CAEP/IFP)A multi-pulsed LIA electron injector is introduced, including the design and the first experimental results. Theinjector can generate multi-pulse intense electron beams with energy of 2 MeV∼3 MeV and beam intensity of2.5 kA. An inductive adder is chosen to generate pulsed diode voltage and both velvet and dispenser cathodeare adopted to generate multi-pulsed intense electron beams. The test results indicate that the design of theinjector is reliable. The multi-pulsed diode voltage is up to 2.5 MV and the beam intensity is more than 2 kAboth near the anode and near the exit of the injector.

MOPB009 Status and Results of the CLIC Decelerator Demonstration in the CLIC Test Facility – S. Döbert (CERN),R. Corsini, R.L. Lillestøl, M. Olvegård, P. Skowronski, G. Sterbini, F. Tecker (CERN) E. Adli (University of Oslo)J.J. García-Garrigós (IFIC) G. Montoro (EPSC) L. Sanchez, F. Toral (CIEMAT)The Test Beam Line (TBL) in the CLIC Test Facility 3 is the first prototype of the CLIC drive beam decelerator.The purpose of the experiment is to demonstrate efficient 12 GHz rf power production and stable transportof the high current drive beam during deceleration. Beam based alignment algorithms suitable for CLIC aretested in TBL. The Test Beam Line consists of a FODO structure with high precision BPMs and quadrupolesmounted on mechanical movers for precise beam based alignment. A total of thirteen Power Extraction andTransfer Structures have currently been installed and commissioned. Results from the deceleration and powerproduction measurements are presented and compared to predictions form beam parameter measurementsand theory.

MOPB010 Design of Dragon-II High Current Accelerator – J. Deng (Institute of Fluid Physics, China Academy of Engineer-ing Physics) S. Chen, Z. Dai, Z. Huang, J. Li, Q. Li, J. Shi, K. Zhang, L.W. Zhang, J. Zhu (CAEP/IFP) Y. Li (CAEP)High rep-rate high current accelerators are of great interests for many applications such as flash X-ray radiogra-phy, high power microwave, free electron laser, THz generation, medical application and so on. It is extremelydifficult for high current accelerators to realize high rep-rate operation especially in the range of kHz to MHzRep-rate due to its high power. A new linear induction accelerator, the Dragon-II facility, based on an innova-tive design will be introduced in the paper. The Dragon-II accelerator is designed to generate and acceleratekA high current electron beams with each pulse width of 80 ns to 20 MeV in up to MHz rep-rate at burst mode.The innovative design to generate multi-pulse accelerating voltage pulses and electron beams as well as theirinitial results will be presented.

MOPB011 Photoinjector of the EBTF/CLARA Facility at Daresbury – B.L. Militsyn (STFC/DL/ASTeC), D. Angal-Kalinin,C. Hill, S.P. Jamison, J.K. Jones, J.W. McKenzie, K.J. Middleman, B.J.A. Shepherd, R.J. Smith, R. Valizadeh,A.E. Wheelhouse (STFC/DL/ASTeC) M.D. Roper (STFC/DL)A description is given of a photoinjector designed for Compact Linear Advanced Research Accelerator (CLARA)and Electron Beam Test Facility (EBTF), which will eventually be used to drive a compact FEL. The photoin-jector is based on a 2.5 cell S-band photocathode RF gun operating with a copper photocathode and drivenby a third harmonic of Ti: Sapphire laser (266 nm) installed in dedicated thermally stabilized room. The in-jector will be operated with laser pulses with an energy of up to 2 mJ, a pulse duration of 100 fs and initially arepetition rate of 10 Hz, with the aim of increasing this eventually to 400 Hz. At a field gradient of 100 MV/mprovided by a 10 MW klystron the gun is expected to deliver beam pulses with energy of up to 6 MeV. Durationand emittance of electron bunches essentially depend on the bunch charge and vary from 0.1 ps at 20 pC to 5ps at 200 pC and from 0.2 to 2 mm mrad respectively. Additional compression of the electron bunches will beprovided with a velocity bunching scheme. For thermal stability the low energy part of the injector is mountedon an artificial granite support.

MOPB012 First RF Measurement Results for the European XFEL SC Cavity Production – A.A. Sulimov (DESY), D. Kostin,G. Kreps, K. Krzysik, W.-D. Möller, D. Reschke (DESY)The first reference cavities for the European XFEL Project were produced and successfully tested by collab-oration of RI, ZANON, IFJ-PAN and DESY (Hamburg). These cavities are dedicated to the test of the wholeinfrastructure, preparation and measurement procedures at the two companies RI and ZANON. All necessaryRF measurements were done, starting with mechanical fabrication in 2011, till the tuning and vertical cavityRF tests in 2012. We present the first results of RF measurements within reference cavities production for theEuropean XFEL.


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MOPB013 Experimental Results on the PHIL Photo-injector Test Stand at LAL – R. Roux (LAL), F. Blot, J. Brossard,C. Bruni, S. Cavalier, J-N. Cayla, A. Gonnin, M.E. Khaldi, P. Lepercq, E.N. Mandag, B. Mercier, H. Monard, C. Pre-vost, V. Soskov, A. Variola (LAL)Since the first beam in November 2009 of the alphaX S-band RF gun, upgrades of the beamline have been car-ried out. Several YAG screens based transverse dimensions monitors have been installed as well as supplemen-tary charge diagnostics. We will present a detailed experimental characterization of the RF gun performancessuch as emittance measurement using a solenoid scan and energy spread as a function of the RF phase. Most ofthe accelerator operation and experimental results have been carried out with a copper photo-cathode. PHILbeing a test stand for photo-injectors, we have also tested a magnesium photo-cathode with the aim of highercharge per bunch thanks to its higher quantum efficiency. We will report on the results of this experiment. InMay 2012, a new RF gun, the PHIN gun, will be installed. This gun which is also a S-band 2,5 cells is a copyof the one that LAL built for the CLIC Test Facility 3 at CERN. In the future, we plan to use this gun to pro-duce a high charge up to 10nC with CsTe photo-cathodes introduced in the gun from a UHV transfer chamber.Preliminary tests and measurements of the beam produced by this gun with a copper photo-cathode will bepresented.

MOPB014 Electron Model of a Dogbone RLA with Multi-Pass Arcs – S.A. Bogacz (JLAB), A. Hutton, G.A. Krafft, V.S. Moro-zov, Y. Roblin (JLAB) K.B. Beard (Muons, Inc)The design of a dogbone RLA with linear-field multi-pass arcs was earlier developed for accelerating muonsin a Neutrino Factory and a Muon Collider. It allows for efficient use of expensive RF while the multi-passarc design based on linear combined-function magnets exhibits a number of advantages over separate-arcor pulsed-arc designs. Such an RLA may have applications going beyond muon acceleration. This paper de-scribes a possible straightforward test of this concept by scaling a GeV scale muon design for electrons. Scalingmuon momenta by the muon-to-electron mass ratio leads to a scheme, in which a 4.35 MeV/c electron beamis injected in the middle of a 2.9 MeV/pass linac with two double-pass return arcs and is accelerated to 17.4MeV/c in 4.5 passes. All spatial dimensions including the orbit distortion are scaled by a factor of 7.5, whicharises from scaling the 200 MHz muon RF to a readily available 1.5 GHz. The footprint of a complete RLA fits ina 25x7 m area. The scheme utilizes only fixed field magnets for both injection and extraction. The hardware re-quirements are not very demanding making it straightforward to implement the scaled design using availableequipment.

MOPB015 Multipactor Discharge Simulation for the RF Photo Gun at PITZ. – I.I. Isaev (DESY Zeuthen), M. Krasilnikov,F. Stephan (DESY Zeuthen)The multipactor discharge leads to high losses of RF power, increasing the time of training, structure heat-ing, and even can lead to breakdown. The multipactor discharge simulations for the PITZ RF Photo Gun wereperformed by CST Studio. The Photo Injector Test facility at DESY, location Zeuthen (PITZ) develops and op-timizes electron sources for Free Electron Lasers (FEL’s). The electrons are generated by the photo effect usinga cesium telluride cathode and are accelerated in a 1.6-cell L-band RF-gun cavity with about 60 MV/m max-imum accelerating field at the cathode. The gun is surrounded by main and bucking solenoid magnets forbeam focusing to counteract the space charge effect. The research of influence of an external magnetic fieldon the multipactor discharge in the PITZ Gun was performed.

MOPB016 In-situ Measurement of Beam-induced Fields in the S-band Accelerating Structures of the Diamond LightSource linac – C. Christou (Diamond)The Diamond pre-injector linac uses two 5.2 m DESY linac II-type accelerating structures to generate a 100MeV electron beam suitable for injection into the booster synchrotron. The structures are powered indepen-dently by two high-power S-band klystrons and are designed to operate at 3 GHz. Higher order modes up to14 GHz induced by beam in unpowered accelerating and bunching structures have been directly measuredusing directional couplers in the high-power waveguide network. These modes are compared with an electro-magnetic simulation of the structures. The negative impact of higher-order wakes on the bunch trains usedat Diamond is considered, and the use of the multipole field measurement for alignment of the beam to thestructure is investigated.

MOPB017 Integration of the European XFEL Accelerating Modules – E. Vogel (DESY), J. Branlard, H. Brueck, S. Choroba,L. Hagge, K. Jensch, V.V. Katalev, L. Lilje, A. Matheisen, W.-D. Möller, D. Nölle, B. Petersen, J. Prenting, D. Reschke,H. Schlarb, J.K. Sekutowicz, W. Singer, H. Weise (DESY) P.B. Borowiec (IFJ-PAN) A. Bosotti, P. Michelato (INFN/LASA) W. Kaabi (LAL) O. Napoly, B. Visentin (CEA/DSM/IRFU) E.P. Plawski (The Andrzej Soltan Institute forNuclear Studies, Centre Swierk) F. Toral (CIEMAT)The production of the 103 superconducting accelerating modules for the European XFEL is an internationaleffort. Institutes and companies from seven different countries (China, France, Germany, Italy, Poland, Russiaand Spain), organized in 12 different work packages contribute with parts, capacity for work and facilities to theproduction of the modules. Currently the series production of the individual parts started or is approaching.Personnel are trained for the assembly and testing of parts and as well for the complete modules. Here wepresent an overview and the status of all these activities.


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MOPB018 Contribution to Mid-field Q Slope in Niobium SRF Cavities from Linear RF Loss Mechanism due to Topo-graphic Surface Structuress – C. Xu (The College of William and Mary)Topographic structures on Superconductivity Radio Frequency (SRF) surfaces can contribute to additional cav-ity RF loss in term of surface RF reflectivity and absorption index in wave scattering theory. At isotropic homo-geneous extent, Power Spectrum Density (PSD) is introduced and quantifies the random surface topographicroughness. PSD are compared on different surface treatments such Electropolishing (EP), Nano-MechanicalPolishing (NMP) and Barrel Centrifugal Polishing (CBP). A perturbation model is utilized to calculate roughsurface additional RF loss based on PSD statistical analysis. This model will not consider that superconduc-tor will become normal at field higher than transition field. Therefore, it is only expected to explain mid-fieldQ performance. One can calculate the RF power dissipation ratio between rough surface and ideal smoothsurface within this field range. Additionally, the resistivity of Nb is temperature and magnetic field dependentfrom classic thermal feedback model theory. Combining with topographic PSD analysis and Rs temperatureand field dependency, a middle field Q slope model could be modeled and the contribution from topographycan be simulated.

MOPB019 High Gradient S-band Linac Development – A.Y. Murokh (RadiaBeam), R.B. Agustsson, S. Boucher, L. Faillace,S. Storms (RadiaBeam) V.A. Dolgashev (SLAC)A high-gradient accelerating S-band structure (HGS) is under development at RadiaBeam Technology to po-tentially increase the accelerating gradients available at S-band up to 50 MV/m, significantly above the currentstate-of-the-art. The HGS structure takes advantage of methodology and innovative design solutions devel-oped for the X-band structures by NLCTA collaboration at SLAC, including optimized couplers design, preci-sion surface processing and cleaning techniques, reduced pulsed heating RF cycle dynamics and improved RFthermal load management. In this paper, the HGS structure RF design, fabrication process, as well as the initialresults of high-power tests at Livermore National Laboratory are presented, and future development outlookis discussed.

MOPB020 LLRF system improvement for HLS Linac Upgrade – G. Huang (USTC/NSRL)The linac beam energy will be upgraded from 200 MeV to 800 MeV, in order to realize the full-energy injectionof storage ring at Hefei Light Source. This paper introduces the improvement of linac LLRF system, whichis composed of phase reference and driver signal transmission and distribution, auto-phasing system, phasereversal device for SLED. the LLRF prototype has been constructed, and the test results is described in thepaper.

MOPB021 Bunch-by-bunch Phase Modulation for Linac Beam-loading Compensation – G. Huang (USTC/NSRL)If the linac is loaded by a high current, long pulse multi-bunch beam, the energy of the beam drops with timeduring the pulse. The bunch phase modulation method is introduced to compensate the beam loading. In thismethod the beam phase in the RF accelerating filed is changed bunch-by-bunch, the beam energy gain in theRF filed gradually grows up, which cancels the drop due to beam loading. The relationship between the beamphase distribution and the linac parameters is calculated in this paper.

MOPB022 RF Characteristic Studies on the Whole Accelerating Structure for BEPC II Linac – S. Pei (IHEP), M. Hou,X. Li, J.R. Zhang (IHEP) B.L. Wang (SINAP)A 2856 MHz 3 m long SLAC-type travelling wave disk-loaded accelerating structure is adopted in the BEPC IIlinac. Its RF characteristics are mainly determined by the 84 regular cells located between the input and outputcouplers. Input/Output couplers need to be included when the RF characteristics of the whole acceleratingstructure are simulated; otherwise it would be difficult to obtain the travelling wave fields excited in the wholestructure. If the real 3-D couplers are modeled during design process, a large amount of computer resourcesand time are needed. However, if the redesigned axial symmetric coupler is adopted to replace the real 3-Dcoupler during the simulation process, much less computer resources and time are required. With the methodproposed in this paper, the simulation results agree well with the theoretically calculated and measured ones.

MOPB023 Progress on the Design of the 100 MeV/100 kW Electron Linear Accelerator for NSC KIPT Neutron Source –S. Pei (IHEP), Y.L. Chi, M. Hou, G. Pei, S.H. Wang, Z.S. Zhou (IHEP) M.I. Ayzatskiy, I.M. Karnaukhov, V.A. Kushnir,V.V. Mytrochenko, A.Y. Zelinsky (NSC/KIPT)In NSC KIPT (National Science Center, Kharkov Institute of Physics and Technology, the Ukraine), a neutronsource based on a subcritical assembly driven by a 100 MeV/100 kW electron linac is being constructed. Thisneutron source is an ANL (Argonne National Laboratory, USA) and NSC KIPT Joint project, and its linac is beingdesigned and constructed by IHEP, P. R. China. The design and construction of such a linac with high averagebeam current, low emittance and low beam power losses is a challenging technical task. Recently, the injectorpart has been fabricated and is being installed in the #2 experimental hall of IHEP, and will be commissionedthis summer to determine whether the chopper system can work well or not, then the design scheme of thewhole linac can be finalized. In the meantime, the BBU effect and the beam loading compensation system inthe injector will be checked/tested and compared with theoretical studies. This paper will present the designstatus/progress of the linear accelerator.


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MOPB024 Beam Dynamics Simulation and Optimization of 10 MeV Superconducting e-Linac Injector for VECC-RIBFacility – A. Chakrabarti (DAE/VECC), S. Dechoudhury, V. Naik (DAE/VECC) F. Ames, R.A. Baartman, Y.-C. Chao,R.E. Laxdal, M. Marchetto, L. Merminga, F. Yan (TRIUMF, Canada’s National Laboratory for Particle and NuclearPhysics) G. Goh (SFU)In the first phase of ongoing collaboration between VECC (India) and TRIUMF (Canada) a 10 MeV supercon-ducting electron linac injector will be installed at VECC. This will constitute a 100 keV DC thermionic gun withgrid delivering pulsed electron beam at 650 MHz. Owing to low energy from the gun, a capture cryo-module(CCM) consisting of two β = 1 single cell elliptical cavities (frequency = 1.3 GHz) will be inserted before a 9-cellβ = 1 elliptical cavity that will provide acceleration to 10 MeV. The present paper depicts the beam dynamicssimulation and optimization of different parameters for the injector with a realistic simulated beam emittancefrom the electron gun.

MOPB025 1ms Multi-bunch Electron Beam Acceleration by a Normal Conducting RF Gun and Superconducting Ac-celerator – M. Kuriki (HU/AdSM), S. Hosoda, H. Iijima (HU/AdSM) H. Hayano, J. Urakawa, K. Watanabe (KEK)G. Isoyama, R. Kato, K. Kawase (ISIR) S. Kashiwagi (Tohoku University, Research Center for Electron Photon Sci-ence) A. Kuramoto (Sokendai) K. Sakaue (RISE)We perform electron beam generation and acceleration of 1 ms long pulse and multi-bunch format at KEK-STF (Superconducting Test Facility). The 1 ms long pulse beam is generated by a normal conducting photo-cathode L-band RF gun. The beam is boosted up to 40 MeV by a super-conducting accelerator. Aim of STFis to establish the super-conducting accelerator technology for ILC (International Linear Collider). The facil-ity is concurrently used to demonstrate high brightness X-ray generation by inverse laser Compton scatteringsupported by MEXT Quantum Beam project. The RF gun cavity has been fabricated by DESY-FNAL-KEK col-laboration. After conditioning process, a stable operation of the cavity up to 4.0 MW RF input with 1 ms pulsewas achieved by keeping low dark current. 1 ms pulse generation and acceleration has been confirmed inMarch 2012. Quasi-monochromatic X-ray generation experiment by Laser-Compton will be carried out at STFfrom the next coming July. We report the latest status of STF.

MOPB026 TRIUMF/VECC e-Linac Injector Beam Test – R.E. Laxdal (TRIUMF, Canada’s National Laboratory for Particleand Nuclear Physics), F. Ames, Y.-C. Chao, S.R. Koscielniak, A. Laxdal, W.R. Rawnsley, V.A. Verzilov (TRIUMF,Canada’s National Laboratory for Particle and Nuclear Physics) J.M. Abernathy, D. Karlen, D.W. Storey (VictoriaUniversity)TRIUMF is collaborating with VECC on the design of a 10 MeV injector cryomodule to be used as a front endfor a high intensity electron linac. A electron gun and low energy beam transport (LEBT) have been installed ina test area to act as the injector for the cryomodule test. The LEBT includes a wide variety of diagnostics to fullycharacterize the beam from the gun. A series of beam tests are being conducted during the stage installation.The test configuration details and results of beam tests will be presented.

MOPB027 A Unique High Gradient Low Emmittance Structure With Built-In HOM Monitors – R.M. Jones (UMAN),I. Nesmiyan (UMAN) A. D’Elia, A. Grudiev, G. Riddone, W. Wuensch (CERN) T. Higo (KEK)In collaboration with CERN, KEK, the University of Manchester, and the Cockcroft Institute, a series of accel-erating structures have been designed and fabricated suitable for high gradient acceleration and high beamquality. These structures facilitate electron beam acceleration whilst simultaneously allowing both the beamposition and inter-cell alignment to be remotely monitored. We present results, indicating excellent agree-ment, on KEK measurements and CERN simulations, on multi-cell stacks. In addition, results on a recentlycompleted set of full structures are presented on higher order modes (HOMs), demonstrating the beam di-agnostics capability. Finally, highlights of simulations on preservation of the beam quality, based on HOMmonitoring, are presented. The ability of these structures to suit multiple applications are discussed.

MOPB028 Analysis of Excitation in a Unique Dual-mode Accelerating Structure – L.R. Carver (UMAN), R.M. Jones(UMAN)A dual mode accelerating structure with reduced surface fields is potentially capable of sustaining 150 MV/m[1]. Here, we analyse the higher order modes of which the wakefield is composed in this unique structure.Means to suppress coherent excitation of the modes is considered by damping and detuning them.

MOPB029 Commissioning of the X-Band Test Area at SLAC – C. Limborg-Deprey (SLAC), C. Adolphsen, M.P. Dunning,C. Hast, R.K. Jobe, E.N. Jongewaard, X.H. Liu, D.J. McCormick, T.O. Raubenheimer, A.E. Vlieks, D.R. Walz,F. Wang, S.P. Weathersby (SLAC)The X-Band Test Area (XTA) is being assembled in the NLCTA tunnel at SLAC to serve as a test facility for newX-Band RF guns. The first gun to be tested is an upgraded version of the 5.6 cell, 200 MV/m peak field X-bandgun designed at SLAC in 2003 for the Compton Scattering experiment run in ASTA [1]. The XTA beamlineis equipped with diagnostics to measure both the longitudinal phase space and the transverse phase spaceproperties of the beam after it has reached 100 MeV. We will review design choices and present some earlycommissioning results.

MOPB030 Performance of First C100 Cryomodules for the CEBAF 12 GeV Upgrade Project – M.A. Drury (JLAB), A. Bur-rill, G.K. Davis, J. Hogan, L.K. King, F. Marhauser, H. Park, J.P. Preble, C.E. Reece, A.V. Reilly, R.A. Rimmer,H. Wang, M. Wiseman (JLAB)The Thomas Jefferson National Accelerator Facility is currently engaged in the 12 GeV Upgrade Project. Thegoal of the project is a doubling of the available beam energy of CEBAF from 6 GeV to 12 GeV. This increasein beam energy will be due primarily to the construction and installation of ten “C100” cryomodules in the


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CEBAF linacs. The C100 cryomodules are designed to deliver an average 108 MV each from a string of eightseven-cell, electropolished superconducting RF cavities operating at an average accelerating gradient of 19.2MV/m. The new cryomodules fit in the same available linac space as the original CEBAF 20 MV cryomodules.Cryomodule production started in September 2010. Initial acceptance testing started in June 2011. The firsttwo C100 cryomodules were installed and tested from August 2011 through October 2011, and successfullyoperated during the last period of the CEBAF 6 GeV era, which ended in May 2012. This paper will present theresults of acceptance testing and commissioning of the C100 style cryomodules to date.

MOPB031 Vibration Response Testing of the CEBAF 12 GeV Upgrade Cryomodules – G.K. Davis (JLAB), J. Matalevich,T. Powers, C.E. Reece, M. Wiseman (JLAB)The CEBAF 12 GeV upgrade project includes 80 new 7-cell cavities assembled into 10 cryomodules. Thesecryomodules were tested during production to characterize their microphonic response in situ. For severalearly cryomodules, detailed (vibration) modal studies of the cryomodule string were performed during theassembly process to identify the structural contributors to the measured cryomodule microphonic response.Structural modifications were then modeled, implemented, and verified by subsequent modal testing and in-situ microphonic response testing. Interim and final results from this multi-stage process will be reviewed.

MOPB032 Precise Stabilization of the Drive Beam Intensity for Advanced CLIC Studies in CTF3 – A. Dubrovskiy (CERN),F. Tecker (CERN) B.N. Bathe, S. Srivastava (BARC-EBC)A new electron beam stabilization system has been introduced in CTF3 in order to open new frontiers forCLIC beam studies in ultra-stable conditions and to provide a sustainable tool for keeping the beam at itsreference position for long term operations. The stabilization system is based on a pulse-to-pulse feedbackcontrol of the gun pulsar to compensate intensity deviations measured by BPMs at the begging of Linac afterthe injector cleaning chicane. Thereby it introduces negligible beam distortions at the end of Linac and relaxesconstraints on the RF and beam variations in the injector. A self-calibration mechanism has been developedto automatically configure the feedback controller for the optimum performance. The residual intensity jitterof the stabilized beam has been measured below 0.05% whereas the CLIC requirement is 0.075%.

MOPB033 High Power Coupler Test for TRIUMF E-linac SC Cavities – A.K. Mitra (TRIUMF, Canada’s National Laboratoryfor Particle and Nuclear Physics), Z.T. Ang, S. Calic, S.R. Koscielniak, R.E. Laxdal, W.R. Rawnsley, R.W. Shanks(TRIUMF, Canada’s National Laboratory for Particle and Nuclear Physics)TRIUMF has been funded to build an electron linac with a final energy of 50 MeV and 500 kW beam powerusing TESLA type 9 cell superconducting cavities operating at 1.3 GHz at 2 Kelvin. The e-linac consists of anelectron gun, buncher cavity, injector cryomodule, and two main-linac cryomodules. The injector modulehas one 9-cell cavity whereas each of the accelerating main-linac cryomodules contains two 9-cell cavities. Itis scheduled to install the injector and one main accelerating cryomodule by 2014. Six power couplers, eachrated for 60 kW cw, have been procured for three cavities. The injector cryomodule will be fed by a 30 kW cwinductive Output Tube (IOT) and the accelerating cryomodule will be powered by a 290 kW cw klystron. Inorder to install the power couplers in the cavities, they are to be assembled and conditioned with high powerrf source. A power coupler test station has been built and tests of two power couplers have began. A 30 kW IOThas been commissioned to full output power and it will be used for the power coupler test. In this paper, testresults of the rf conditioning of the power couplers under pulse and cw mode will be described.

MOPB034 Novel Technique of Suppressing TBBU in High-energy ERLs – V. Litvinenko (BNL)Energy recovery linacs (ERLs) is emerging generation of accelerators promising revolutionize the fields of high-energy physics and photon sciences. One potential weakness of these devices is transverse beam-breakupinstability, which may severely limit available beam current. In this paper I am presenting new idea [1] de-veloped for high-energy ERL which could be used for eRHIC, LHeC and, potentially, ILC: a concept of usingmain ERL linacs and natural chromaticity to suppressing TBBU instabilities by simplifying an ERL lattice. Asdemonstration of this method, I present tow specific example of eRHIC and LHeC ERLs.

MOPB035 The Linear Accelerating Structure Development for HLS Upgrade – K. Jin (USTC/NSRL)Hefei Light Source (HLS) is mainly composed of an 800 MeV electron storage ring and a 200 MeV constant-impedance Linac functioning as its injector. A new Linac is developed in view of the Full Energy Injection andthe Top-up Injection scheme will be adopted in the HLS upgrade. In this paper, an 800 MeV linear acceleratingsystem construction, the constant-gradient structure design and the symmetry couplers consideration will bedescribed in detail. The manufacture technology, the RF measurement, the high power test results and theaccelerating system operation are presented.

MOPB036 Feasibility Study of Short Pulse Mode Operation for Multi-turn ERL Light Source – T. Atkinson (HZB),A.V. Bondarenko, A.N. Matveenko, Y. Petenev (HZB)The optics and simulation group at HZB are designing Germany’s future light source. Based on the emergingEnergy Recovery Linac super conducting technology, the Femto-Science-Factory (FSF) will provide its userswith ultra-bright photons of Angstrom wavelength at 6 GeV. The FSF is intended to be a multi-user facility andoffer a wide variety of operation modes. A low emittance ∼0.1 µm rad mode will operate in conjunction witha short-pulse ∼10 fs mode. This paper highlights the physical limitations when trying to offer interchangeablemodes and preserve beam high quality.


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MOPB037 Linac Optics Design for Multi-turn ERL Light Source – Y. Petenev (HZB), T. Atkinson, A.V. Bondarenko,A.N. Matveenko (HZB)The optics simulation group at HZB is designing a multi-turn energy recovery linac-based light source. Usingthe superconducting Linac technology, the Femto-Science-Factory (FSF) will provide its users with ultra-brightphoton beams of angstrom wavelength at 6 GeV. The FSF is intended to be a multi-user facility and offer a vari-ety of operation modes. In this paper a design of transverse optic of the beam motion in the Linacs is presented.An important point in the optics design was minimization of the beta-functions in the linac at all beam passesto suppress beam break-up (BBU) instability.

MOPB038 Single Shot Bunch-by-bunch Beam Emittance Measurement of the SPring-8 Linac – Y. Shoji (LASTI),K. Takeda (LASTI)Bunch by bunch emittance of a single shot beam from the SPring-8 electron linac was measured. The linacis operated as an injector to the electron storage ring, NewSUBARU. A high beam stability is required for thestable top-up injection into the ring with a small acceptance. We used the electron ring as a part of the mea-surement system. The electron beam from the linac was injected into the ring and circulated for many turns.The beam profiles were recorded by a dual-sweep streak camera using the visible light in the ring. The fastsweep separated the bunches in 1 ns macro pulse and the slow sweep separated the profiles at different rev-olutions. It enabled a multi-record of beam profiles in one camera frame. Betatron oscillation in the ringproduced the phase space rotation for the reconstruction of the beam emittance. The ring parameters wereoptimized for the measurement because the beam storage was not necessary. A stability of the linac beam wasevaluated from the shot by shot fluctuation of the emittance and the bunch structure. We also compared theemittances of a front bunch and a rear bunch in the same pulse.

MOPB040 Measurements and Optimization of the NSLS-II Linac Beam Parameters – T.V. Shaftan (BNL), A. Blednykh,J. Choi, M.A. Davidsaver, J.H. De Long, R.P. Fliller, F. Gao, J. Rose, S. Seletskiy, G. Shen, G.M. Wang, F.J. Willeke,X. Yang (BNL)200-MeV linac has entered commissioning at NSLS-II. In this paper we discuss the basis for the NSLS-II injectorspecifications on the beam parameters. We will also present some results from ongoing measurements andoptimization of the linac beam.

MOPB041 Advances in Beam Tests of Dielectric-based Accelerating Structures – A. Kanareykin (Euclid TechLabs, LLC),S.P. Antipov, C.-J. Jing (Euclid TechLabs, LLC) W. Gai (ANL)Diamond is being evaluated as a dielectric material for dielectric loaded accelerating structures. It has a verylow microwave loss tangent, high thermal conductivity, and supports high RF breakdown fields. We reporton progress in our recent beam tests of the diamond based accelerating structures of the Ka-band and THzfrequency ranges. Wakefield breakdown test of a diamond-loaded accelerating structure has been carried outat the ANL/AWA accelerator. The high charge beam from the AWA linac (∼70 nC, σz = 2.5 mm) was passedthrough a rectangular diamond loaded resonator and induce an intense wakefield. A groove is cut on thediamond to enhance the field. Electric fields up to 0.3 GV/m has been detected on the diamond surface toattempt to initiate breakdown. A surface analysis of the diamond has been performed before and after thebeam test. Wakefield effects in a 250 GHz planar diamond accelerating structure has been observed at BNL/ATF accelerator as well. We have directly measured the mm-wave wake fields induced by subpicosecond,intense relativistic electron bunches in a diamond loaded accelerating structure via the dielectric wake-fieldacceleration mechanism.

MOPB042 On-line Dispersion-free Steering for the Main Linac of CLIC – J. Pfingstner (CERN), D. Schulte (CERN)For future linear colliders as well as for light sources, ground motion effects are a severe problem for the ac-celerator performance. After a few minutes, orbit feedback systems are not sufficient to mitigate all groundmotion effects and additional long term methods will have to be deployed. In this paper, the long term groundmotion effects in the main linac of the Compact Linear Collider (CLIC) are analysed via simulation studies. Theprimary growth of the projected emittance is identified to originate from chromatic dilutions due to dispersivebeam orbits. To counter this effect, an on-line identification algorithm is applied to measure the dispersionparasitically. This dispersion estimate is used to correct the beam orbit with an iterative dispersion free steer-ing algorithm. The presented results are not only of interest for the CLIC project, but for all linacs in which thedispersive orbit has to be corrected over time.

MOPB043 Detailed Analysis of Long-Range Wakefield in the Baseline Design of the CLIC Main Linac – V.F. Khan (CERN),A. Grudiev (CERN)The baseline design for the accelerating structure of the CLIC main linac relies on strong damping of transversehigher order modes (HOMs). Each accelerating cell is equipped with four damping waveguides that enablesHOM energy to propagate to damping loads. Most of the HOMs decay exponentially with a Q-factor of about10 however, there are modes with higher Q-factors. Though the amplitude of the high Q modes is nearly twoorders of magnitude smaller than the dominating lowest dipole mode, their cumulative effect over the entirebunch train may be significant and dilute the beam emittance to unacceptable level. In this paper we report onan accurate calculation of the long-range wakefield and its overall effect on beam dynamics. We also discusspossible measures to minimise its effect in a tapered structure.


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MOPB044 ILC RF Development Summary – C. Adolphsen (SLAC)A major milestone for the ILC will be the release of the TDR next summer. Thus, it is a good time to reviewthe progress that has been made during the last eight years to develop, improve and validate the 1.3 GHz rfsystem components (i.e. modulators, klystrons, rf distribution and power couplers)for the ILC linacs. Thispaper reviews this history and discusses other uses for this L-band technology.

MOPB045 Specifications of the Distributed Timing System for the CLIC Main Linac – A. Gerbershagen (CERN), A. An-dersson, D. Schulte (CERN) P. Burrows, A. GerbershagenThe longitudinal phase stability of CLIC main and drive beams is a crucial element of CLIC design. In orderto measure and to control the phase, a distributed phase monitoring system has been proposed. The systemmeasures the beam phase every 900 m. The relative phase between the measurement points is synchronizedwith an external reference system via a chain of reference lines. This paper presents the simulations of errorpropagation in the proposed distributed monitoring system and the impact on the drive and main beam phaseerrors and the luminosity. Based on the results the error tolerances for the proposed system are detailed.

MOPB046 A 10 MeV L-band Linac for Irradiation Applications in China – G. Pei (IHEP), Y.L. Chi (IHEP)The electron linear accelerator has wide applications, and the demands are keeping growing for the irradiationapplications in China. A high beam power 10 MeV L-band Linac has been developed recently as a joint ventureof Institute of High Energy Physics and EL-PONT Company. The Thales TH2104U klystron, 3 A thermionicelectron gun and three meter L-band disk-loaded constant impedance RF structure are adopted. A stableelectron beam of 10 MeV, 40 kW has been obtained in the last May with a microwave to beam efficiency ofabout 65%. In this paper we will present the detailed design issues and beam commissioning.

MOPB047 Applications of Compact Dielectric Based Accelerators – C.-J. Jing (Euclid TechLabs, LLC), S.P. Antipov, A. Ka-nareykin, P. Schoessow (Euclid TechLabs, LLC) M.E. Conde (ANL)Important progress on the development of dielectric based accelerators has been made experimentally andtheoretically in the past few years. One advantage of dielectric accelerators over the metallic counterparts isits compact size, which may attract some applications in industrial or medical accelerators. In this article, wediscuss the design and technologies of dielectric based accelerators toward these needs.

MOPB048 Linear Accelerator Based on Parallel Coupled Accelerating Structure – A.E. Levichev (BINP SB RAS),A.M. Barnyakov, V.M. Pavlov (BINP SB RAS) Y.D. Chernousov (ICKC) V. Ivannikov, I.V. Shebolaev (ICKC SB RAS)Accelerating stand based on parallel coupled accelerating structure and electron gun is developed and pro-duced. The structure consists of five accelerating cavities. The RF power feeding of accelerating cavities isprovided by common exciting cavity which is performed from rectangular waveguide loaded by reactive pins.Operating frequency is 2450 MHz. Electron gun is made on the basis of RF triode. Linear accelerator was testedwith different working regimes. The obtained results are following: energy is up to 4 MeV, accelerating currentis up to 300 mA with pulse duration of 2.5 ns on the half of the width; energy is up to 2.5 MeV, acceleratingcurrent is up to 100 mA with pulse duration of 5 µs; energy is up to 2.5 MeV, accelerating current is up to 120mA with pulse duration of 5 µs and beam capture of 100%. The descriptions of the accelerator elements aregiven in the report. The features of the parallel coupled accelerating structure are discussed. The results of themeasuring accelerator’s parameters are presented.

MOPB049 Standing-wave Accelerating Structure Enhancing RF Phase Focusing – H.R. Yang (POSTECH), M.-H. Cho,J. Jang, S.H. Kim, W. Namkung, S.J. Park (POSTECH) J.-S. Oh (NFRI)A C-band standing-wave accelerator for a compact X-ray source is designed and being fabricated. It is capa-ble of producing 6-MeV electron beams with pulsed 100-mA using a 5-GHz magnetron with pulsed 1.5 MWand average 1.2 kW. The beams are focused by less than 1.5 mm without external magnets. The acceleratingstructure is a bi-periodic on-axis-coupled with a built-in bunching section, and it is operated with π/2-modestanding-waves. It consists of 3 bunching cells, 13 accelerating cells and a coupler cell. The configuration ofthe bunching section and the geometry of the first bunching cell are designed to enhance the RF phase focus-ing in order to achieve a 1.2-mm beam size. Each cavity in the bunching and normal cell are designed by theMWS code for treating asymmetric magnetic coupling slots. As a result, effective shunt impedance is maxi-mized with 3.5% inter-cell coupling in normal cells. The coupler size in the coupler cell is determined for thecritical coupling in OFHC cavity with the MWS code. In this paper, we present design details of RF cavities andthe accelerating column. Also, we present the beam dynamics simulation by the PARMELA code

MOPB050 Compact, Inexpensive X-band Linacs as Radioactive Isotope Source Replacements – A.Y. Murokh (Radia-Beam), R.B. Agustsson, S. Boucher, X.D. Ding, L. Faillace, S. Storms (RadiaBeam)Radioisotope sources are commonly used in a variety of industrial and medical applications. The US NationalResearch Council has identified as a priority the replacement of high-activity sources with alternative tech-nologies, due to the risk of accidents and diversion by terrorists for use in Radiological Dispersal Devices (“dirtybombs”). RadiaBeam Technologies is developing novel, compact, inexpensive linear accelerators for use in avariety of such applications as cost-effective replacements. The technology is based on the MicroLinac (orig-inally developed at SLAC), an X-band linear accelerator powered by an inexpensive and commonly availablemagnetron. Prototypes are currently under construction. This paper will describe the design, engineering,fabrication and testing of these linacs at RadiaBeam. Future development plans will also be discussed.


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MOPB051 Changing Attitude to Radiation Hazards and Consequent Opportunities for LINAC Applications – Y. Socol(Falcon Analytics)High-energy LINACs unavoidably yield ionizing radiation. This fact makes them subject to strict regulationsand considerably limits applications. During the last two decades the attitude to ionizing radiation hazardsseems to become more balanced, as opposed to "radiophobia" of the Cold-War era. Scientifically, the linearno-threshold (LNT) model of radiation damage is more and more questioned. Moreover, the hypotheses ofradiation hormesis - beneficial effect of low-dose radiation - is studied. While this scientific debate has notyet given fruit regarding radiation regulation and policy, we may expect this in near to middle term. Namely,the ALARA (as low as reasonably achievable) demand is anticipated to be substituted by some tolerance level,which in turn is anticipated to be very high according to the present standards. The presentation will review thepresent status of the radiation-hazard debate, and outline anticipated opportunities for LINAC applications,like compact designs and wider industrial outreach.

03 TechnologyMOPB052 Fermilab 1.3 GHz Superconducting RF Cavity and Cryomodule Program for Future Linacs – C.M. Ginsburg

(Fermilab)The proposed Project X accelerator and the International Linear Collider are based on superconducting RFtechnology. As a critical part of this effort, Fermilab has developed an extensive program in 1.3 GHz SRF cavityand cryomodule development. This program includes cavity inspection, surface processing, clean assembly,low-power bare cavity tests and pulsed high-power dressed cavity tests. Well performing cavities have beenassembled into cryomodules for pulsed high-power tests and will be tested with beam. In addition, peripheralhardware such as tuners and couplers are under development. The current status and accomplishments ofthe Fermilab 1.3 GHz activity will be described, as well as the R&D program to extend the existing SRF pulsedoperational experience into the CW regime.

MOPB053 Non-destructive Inspections for SC Cavities – Y. Iwashita (Kyoto ICR), Y. Fuwa, M. Hashida, K. Otani, S. Sa-kabe, S. Tokita, H. Tongu (Kyoto ICR) H. Hayano, K. Watanabe, Y. Yamamoto (KEK)Non-destructive Inspections play important roles to improve yield in production of high-performance SC Cavi-ties. Starting from the high-resolution camera for inspection of the cavity inner surface, high resolution T-map,X-map and eddy current scanner have been developed. We are also investigating radiography to detect smallvoids inside the Nb EBW seam, where the target resolution is 0.1 mm. We are carrying out radiography testswith X-rays induced from an ultra short pulse intense laser. Recent progress will be presented.

MOPB054 Test Results of Tesla-style Cryomodules at Fermilab – E.R. Harms (Fermilab), K. Carlson, B. Chase, D.J. Craw-ford, E. Cullerton, D.R. Edstrom, Jr, A. Hocker, M.J. Kucera, J.R. Leibfritz, O.A. Nezhevenko, D.J. Nicklaus, Y.M. Pis-chalnikov, P.S. Prieto, J. Reid, W. Schappert, P. Varghese (Fermilab)Commissioning and operation of the first Tesla-style Cryomodule (CM-1) at Fermilab was concluded in recentmonths. It has now been replaced by a second Tesla Type III+ module, RFCA002. It is the first 8-cavity ILC stylecryomodule to be built at Fermilab and also the first accelerating cryomodule of the Advanced Superconduct-ing Test Accelerator (ASTA). We report on the operating results of both of these cryomodules.

MOPB055 Development of Superconducting Radio-Frequency (SRF) Deflecting Mode Cavities and Associated Waveg-uide Dampers for the APS Upgrade Short Pulse X-Ray Project – J.P. Holzbauer (ANL), A. Nassiri, G.J. Wald-schmidt, G. Wu (ANL)The Advanced Photon Source Upgrade (APS-U) is a Department of Energy (DoE) funded project to increase theavailable x-ray beam brightness and add capability to enhance time-resolved experiments on few-ps-scale atAPS. A centerpiece of the upgrade is the generation of short pulse x-rays (SPXs) for pump-probe time-resolvedcapability using SRF deflecting cavities[1]. The SPX project is designed to produce 1-2 ps x-ray pulses for someusers compared to the standard 100 ps pulses currently produced. SPX calls for using superconducting rf (SRF)deflecting cavities to give the electrons a correlation between longitudinal position in the bunch and verticalmomentum [2]. The light produced by this bunch can be passed through a slit to produce a pulse of light muchshorter than the bunch length at reduced flux. The ongoing work of designing these cavities and associatedtechnologies will be presented. This includes the design and prototyping of higher-order (HOM) and lower-order mode (LOM) couplers and dampers as well as the fundamental power coupler (FPC). This work will begiven in the context of SPX0, a demonstration cryomodule with two deflecting cavities to be installed in APS inearly 2014.

MOPB056 Multipacting Analysis of High-velocity Superconducting Spoke Resonators – C.S. Hopper (ODU), J.R. Delayen(ODU)Some of the advantages of superconducting spoke cavities are currently being investigated for the high-velocityregime. When determining a final, optimized geometry, one must consider the possible limiting effects multi-pacting could have on the cavity. We report on the results of analytical calculations and numerical simulationsof multipacting electrons in superconducting spoke cavities and methods for reducing their impact.

MOPB057 Mechanical Study of the First Superconducting Half-wave Resonator for Injector II of CIADS Project – S. He(IMP), Y. He, S.C. Huang, R.X. Wang, Y.Z. Yang, W.M. Yue, C. Zhang, S.H. Zhang, S.X. Zhang, H.W. Zhao (IMP)G. Cheng, H. Wang (JLAB)Within the framework of the China Accelerator-Driven Sub-critical Systems (CIADS) project, Institute of Mod-ern Physics (IMP) Chinese Academic of Sciences has proposed a 162.5 MHz Half-Wave Resonator (HWR) Su-


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perconducting cavity for low energy section (β=0.09) of high power proton linear accelerators as a new in-jector II for CIADS. For the geometrical design of superconducting cavities structure mechanical simulationsare essential to predict mechanical eigenmodes and the deformation of the cavity walls due to bath pressureeffects and the cavity cool-down. Additionally, the tuning analysis has been investigated to control the fre-quency against microphonics and Lorentz force detuning. Therefore, several RF, static structure, thermal andmodal analysis with a three-dimensional Finite-Element Method (FEM) code Traditional ANSYS have beenperformed.

MOPB058 Supply of Nb/NbTi Semi-Finished Products for Series S.C. Cavity Fabrication for the EUROPEAN XFEL –Quality Control, Logistics and Documentation – J. Iversen (DESY), A. Brinkmann, W.-D. Möller, W. Singer,X. Singer (DESY)More than 24000 semi-finished products of niobium and niobium-titanium alloy are required for series fabri-cation of superconducting cavities for the European XFEL. The strategy for Quality Control, logistic issues anddocumentation were developed by DESY. Quality testing of twelve different types of sheets, discs and rods isperformed according to the rules of international standards and the European Pressure Equipment DirectivePED 97/23/EC. We summarize the test procedures, logistic requirements, documentation methods and thecurrent situation of the examination phase.

MOPB059 The Superconducting CH Cavity Development in IMP – M.X. Xu (IMP), Y. He (IMP)Superconducting CH cavity which with the feature of high accelerating gradient and mechanical rigidity, is anideal option to connect the low energy RFQ and the middle energy superconducting cavity. The supercon-ducting CH cavity had been chose a backup cavity type to accelerate proton from 2.1 MeV to 10 MeV for theADS of China in IMP. The following introduce the developing superconducting prototype 6 cell CH cavity withfrequency 162.5 MHz, β=0.067 in IMP, including the EM design and fabrication processing.

MOPB060 RF Surface Impedance Characterization of Potential New Materials for SRF-based Accelerators – B. Xiao(JLAB), G.V. Eremeev, H.L. Phillips, C.E. Reece (JLAB) M.J. Kelley, B. XiaoIn the development of new superconducting materials for possible use in SRF-based accelerators, it is usefulto work with small candidate samples rather than complete resonant cavities. The recently commissioned Jef-ferson Lab rf Surface Impedance Characterization (SIC) system* can presently characterize the central regionof 50 mm diameter disk samples of various materials from 2 to 40 K exposed to RF magnetic fields up to 14 mTat 7.4 GHz. We report the measurement results from bulk Nb, thin film Nb on Cu and sapphire substrates, andthin film MgB2 on sapphire substrate provided by colleagues at JLab and Temple University. We also report onefforts to extend the operating range to higher fields.

MOPB061 The New 2nd Generation SRF R&D Facility at Jefferson Lab: TEDF – C.E. Reece (JLAB), A.V. Reilly (JLAB)The US Department of Energy has funded a near-complete renovation of the SRF-based accelerator researchand development facilities at Jefferson Lab. The project to accomplish this, the Technical and EngineeringDevelopment Facility (TEDF) Project has completed the first of two phases. An entirely new 3,300 m2 purpose-built SRF technical work facility has been constructed and is being occupied in summer of 2012. All SRF workprocesses with the exception of cryogenic testing has been relocated into the new building. All cavity fabri-cation, processing, thermal treatment, chemistry, cleaning, and assembly work is collected conveniently intoa new LEED-certified building. An innovatively designed 750 m2 cleanroom/chemrooms suite provides long-term flexibility for support of multiple R&D and construction projects as well as continued process evolution.The detailed characteristics of this perhaps first 2nd-generation SRF facility will be described.

MOPB062 A New Internal Optical Profilometry System for Characterization of RF Cavity Surfaces – CYCLOPS –C.E. Reece (JLAB), A.D. Palczewski, H. Tian (JLAB)Jefferson Lab has received and commissioned a new interferometric optical profilometer specifically designedto provide internal surface mapping of elliptical rf cavities. The CavitY CaLibrated Optical Profilometry Sys-tem – CYCLOPS – provides better than 2 micron lateral resolution and 0.1 micron surface height resolution ofprogrammatically selected locations on the interior surface of multi-cell cavities. The system is being used toprovide detailed characterization of surface topographic evolution as a function of applied surface treatmentsand to investigate particular localized defects. We also intend to use the system for 3D mapping of actual in-terior rf surface geometry for feedback to structure design model and fabrication tooling. First uses will beillustrated. CYCLOPS was developed and fabricated by MicroDynamics Inc., Woodstock, GA, USA.

MOPB063 Superconducting RF Linac for eRHIC – S.A. Belomestnykh (BNL), I. Ben-Zvi, J.C. Brutus, H. Hahn, D. Kayran,V. Litvinenko, G.J. Mahler, G.T. McIntyre, V. Ptitsyn, R. Than, J.E. Tuozzolo, W. Xu, A. Zaltsman (BNL) S.A. Be-lomestnykheRHIC will collide high-intensity hadron beams from RHIC with 50-mA electron beam from a six-pass 30-GeVEnergy Recovery Linac (ERL), which will utilize 704 MHz superconducting RF accelerating structures. Thispresentation describes the eRHIC SRF linac requirements, layout and parameters, 5-cell SRF cavity with a newHOM damping scheme, project status and plans.


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MOPB064 Developing of Superconducting RF Guns at BNL – S.A. Belomestnykh (BNL), Z. Altinbas, I. Ben-Zvi, J.C. Bru-tus, D.M. Gassner, H. Hahn, L.R. Hammons, J.P. Jamilkowski, D. Kayran, J. Kewisch, V. Litvinenko, G.J. Mahler,G.T. McIntyre, D. Pate, D. Phillips, T. Rao, S.K. Seberg, T. Seda, B. Sheehy, J. Skaritka, K.S. Smith, R. Than,J.E. Tuozzolo, E. Wang, Q. Wu, W. Xu, A. Zaltsman (BNL) S.A. Belomestnykh, J. Dai, M. Ruiz-Osés, T. Xin (StonyBrook University) C.H. Boulware, T.L. Grimm (Niowave, Inc.) A. Burrill (JLAB) R. Calaga (CERN) M.D. Cole,A.J. Favale, D. Holmes, J. Rathke, T. Schultheiss, A.M.M. Todd (AES) X. Liang (SBU)BNL is developing several superconducting RF guns for different applications. The first gun is based on ahalf-cell 1.3 GHz elliptical cavity. This gun is used to study generation of polarized electrons from GaAs pho-tocathodes. The second gun, also of a half-cell elliptical cavity design, operates at 704 MHz and is designedto produce high average current electron beam for the ERL prototype from a multi-alkali photocathodes. Thethird gun is of a quarter-wave resonator type, operating at 112 MHz. This gun will be used for photocathodestudies, including a diamond-amplified cathode, and to generate high charge, low repetition rate beam for thecoherent electron cooling experiment. In this presentation we will briefly describe the gun designs, presentrecent test results and discuss future plans.

MOPB065 Impact of Trapped Magnetic Flux and Systematic Flux Expulsion in Superconducting Niobium – J.M. Vogt(HZB), J. Knobloch, O. Kugeler (HZB)The intrinsic quality factor Q0 of superconducting cavities is known to depend on various factors like niobiummaterial properties, treatment history and magnetic shielding. We already reported an additional impact oftemperature gradients during the cool-down on the obtained Q0. We believe cooling conditions can influencethe level of flux trapping and hence the residual resistance. For further studies we have constructed a test standusing niobium rods to study flux trapping. Here we can precisely control the temperature and approach Tc inthe superconducting state. Although the sample remains in the superconducting state a change in the amountof trapped flux is visible. The procedure can be applied repeatedly resulting in a significantly lowered level oftrapped flux in the sample. Applying a similar procedure to a superconducting cavity could allow for reductionof the magnetic contribution to the surface resistance and result in a significant improvement of Q0.

MOPB066 Alternative designs for HOM-damped SRF cavities – B. Riemann (DELTA), T. Weis (DELTA) A. Neumann (HZB)Elliptical cavities have been a standard in SRF linac technology for 30 years. We present another approach tobase cell geometry based on Bezier splines, that leads to equal performance levels and is much more flexiblein terms of optimization. Using the BERL inPro main linac as an example, a spline multicell cavity is designedwith equal performance goals. For the damping of higher order modes (HOMs), the installation of waveguidesat the ends of a multicell cavity is a common approach. We discuss the possibility of multicell cavities which arecoupled to each other directly by a perturbed base cell that contains waveguide dampers. With this approach,a further increase of average acceleration gradient might be possible.

MOPB067 Results and Performance Simulations of the Main Linac Design for BERL inPro – A. Neumann (HZB), W. An-ders, J. Knobloch (HZB) K. Brackebusch, T. Flisgen, T. Galek, K. Papke, U. van Rienen (Rostock University, Facultyof Computer Science and Electrical Engineering) B. Riemann, T. Weis (DELTA)The Berlin Energy Recovery Linac Project (BERL inPro) is designed to develop and demonstrate CW LINACtechnology for 100-mA-class ERLs. High-current operation requires an effective damping of higher-ordermodes (HOMs) of the 1.3 GHz main-linac cavities. We have studied elliptical 7-cell cavities damped by onthe whole five waveguides at both ends. Eigenmode computations for geometrical figures of merit show thatthe present design should allow successful CW linac operation at the maximum beam current of 100 mA/77pC bunch charge. To verify the results, the external Q factors are compared to the results of S-Parameter sim-ulations that are postprocessed by a pole-fitting technique. First results of scattering parameter measurementon a room-temperate aluminium model are discussed. An outlook presenting the possibilities of combinedmulti-cavity simulations is included.

MOPB068 Plasma Processing of SRF Cavities for Compact Light Sources – S. Popovic (ODU), M. Basovic, A.L. Godunov,J. Upadhyay, L. Vuškovic (ODU)A number of cavities has presently been designed for application in high-brightness, high space-charge com-pact light sources. Plasma processing has been increasingly considered as a viable procedure for pre- andpost-operation treatment, with the goal to minimize operation and maintenance cost, by reducing or elimi-nating multipactors, field emission, and space charge-related problems. We are discussing issues related tothe given cavity designs, starting from power coupling and large-volume microwave plasma breakdown to theplasma effects on the specific cavity geometry. We also present the experimental and computer simulationresults from several in-situ and ex-situ plasma processing experiments currently in progress at the Center ofAccelerator Science, ODU, in collaboration with various project teams at TJNAF.

MOPB069 Study of HPR Created Oxide Layer at Nb Surfaces – P.V. Tyagi (HZB) H. Hayano, S. Kato, T. Saeki (KEK)The performance of superconducting radio frequency (SRF) niobium (Nb) cavities strongly depends on finalsurface condition. Therefore the surface preparation of these SRF cavities often becomes critical. The prepa-ration of surface includes two steps; surface chemistry (in order to get a smooth surface) and cleaning/rinsing(in order to remove contaminants left after the surface chemistry). As high pressure rinsing (HPR) with ultrapure water (UPW) is most commonly used surface cleaning method after the surface chemistry, it’s very in-teresting to characterize the Nb surfaces after HPR. Results of our surface characterization done by XPS (x-rayphotoelectron spectroscopy) with depth profiling show the presence of a thicker oxide surface characteriza-tion results show the presence of a thicker oxide layer at Nb surface as an outcome of HPR. In this article, we


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report the production of oxide layer (FWHM thickness) based on different conditions such as the pressuresand doses.

MOPB070 Quality Control of Cleanroom Processing Procedures of SRF Cavities for Mass Production – R. Oweiss (FRIB),L.J. Dubbs, K. Elliott, A. Facco, M. Hodek, I.M. Malloch, J. Popielarski, L. Popielarski, K. Saito (FRIB)Quality control is a key factor in the success of SRF cavity mass production. This paper summarizes ongoingresearch at the Facility for Rare Isotope Beams FRIB to validate the quality assurance of SRF cavities mean-while optimizing processing procedures for mass production. Experiments are conducted to correlate surfacecleanliness for niobium surfaces with high pressure rinse time using β=0.085 quarter-wave resonators (QWR)cavities. Diagnostic devices; liquid particle counter, surface particle detector and TOC analyzer are used tomonitor key parameters for quality control. Rinse water samples are collected during high pressure rinsingto measure liquid particle counts. The SLS 1200 Sampler is used to detect the presence of liquid particles of0.2 microns and up to 1 micron to set standards for acceptable cleaning thresholds and optimize high pres-sure rinse time. The QIII+ surface particle detector is used to scan high electric field region for the β=0.085QWR to ensure high pressure rinsing efficiency. The β=0.085 QWR RF testing data are analyzed and results arepresented to demonstrate the correlation between attained acceleration gradients and surface cleanliness.

MOPB071 Process Developments for Superconducting RF Low Beta Resonators for the ReA3 LINAC and Facility forRare Isotope Beams – L. Popielarski (FRIB), C. Compton, L.J. Dubbs, K. Elliott, L.L. Harle, I.M. Malloch,R. Oweiss, J.P. Ozelis, K. Saito (FRIB) A. Facco (INFN/LNL) J. Popielarski (NSCL)The Facility for Rare Isotope Beams (FRIB) will utilize over 330 superconducting radio frequency (SRF) lowbeta cavities for its heavy ion driver linac. The SRF department will process and test all cavities prior to stringassembly in the cleanroom. The baseline cavity surface and bulk niobium processing procedures have been es-tablished. The methods are being optimized for production process rate benchmarking. Additional processesare being developed to increase flexibility and reduce technical risks. This paper will describe procedure devel-opments and experimental results. Topics include high temperature heat treatment for hydrogen degassing,selective chemical etching for cavity frequency tuning, low-temperature bake out and process quality control.

MOPB072 Multipole Expansion of the Fields in Superconducting High-Velocity Spoke Cavities – R.G. Olave (ODU),J.R. Delayen, C.S. Hopper (ODU)Multi-spokes superconducting cavities in the high-beta regime are being considered for a number of appli-cations. In order to accurately model the dynamics of the particles in such cavities, knowledge of the fieldsoff-axis are needed. We present a study of the multipoles expansion of the fields from an EM simulation fielddata for a two-spoke cavity operating at 325 MHz, β = 0.82.

MOPB073 Cold Testing of Superconducting 72 MHz Quarter-wave Cavities for ATLAS – M.P. Kelly (ANL), Z.A. Conway,S.M. Gerbick, M. Kedzie, R.C. Murphy, P.N. Ostroumov, T. Reid (ANL)A set of seven 72 MHz β=0.077 superconducting quarter-wave cavities for a beam intensity upgrade of theATLAS heavy-ion accelerator has been completed. Cavities have been fabricated using the lessons learnedfrom the worldwide effort to extend the performance of niobium cavities close to the limits of the material.Key developments include the use of electropolishing on the completed cavity and with a temperature controlsystem substantially upgraded from that for elliptical-cell EP systems. Wire EDM, used instead of traditionalniobium machining, appears to be effective in eliminating performance limiting defects near the weld seams.Hydrogen degassing at 600C after electropolishing permits practical acceleration at 2 Kelvin with Bpeak>120mT and cavity voltages>5 MV/cavity.

MOPB074 Thermo-Mechanical Simulations of the Frequency Tuning Plunger for the IFMIF Half-Wave Resonator –N. Bazin (CEA/DSM/IRFU), P. Bosland, S. Chel, G. Devanz, N. Grouas, P. Hardy, J. Migne, F. Orsini, F. Peauger(CEA/DSM/IRFU) E.N. Zaplatin (FZJ)In the framework of the International Fusion Materials Irradiation Facility (IFMIF), a superconducting optionhas been chosen for the 5 MeV RF Linac of the first phase of the project (EVEDA), based on a cryomodulecomposed of 8 HWRs, 8 RF couplers and 8 Solenoid packages. The frequency tuning system of the IFMIF HWRis an innovated system based on a capacitive plunger installed in the electric field region allowing a large tuningrange. Following the cold test results obtained on HWR equipped with the first design of plunger in 2011*, itwas decided to develop a new design of a fully-niobium plunger. The paper will present the development ofthe new plunger concepts and the thermo-mechanical simulations. For the mechanical simulations, the aim isto sufficiently deform the plunger to tune the cavity while staying in the elastic range of the niobium material.For the thermal simulations, all the non-linear properties of the materials and the effects of the RF fields aretaken into account: thermal conductivity and surface resistance are depending on the temperature, RF fieldscomputed with dedicated software are leading to thermal dissipations in the materials and the vacuum seal.


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MOPB075 SPL β=1 Cavities and Helium Tank – O. Capatina (CERN), G. Arnau-Izquierdo, S. Atieh, I. Aviles Santillana,S. Calatroni, P. Coelho Moreira de Azevedo, M. Esposito, R. Garoby, F. Gerigk, M. Malabaila, L. Marques AntunesFerreira, S. Mikulas, V. Parma, T. Renaglia, K.M. Schirm, N. Schwerg, T. Tardy, N. Valverde Alonso, A. VandeCrean (CERN)The Superconducting Proton Linac (SPL) is an R&D effort coordinated by CERN in partnership with other inter-national laboratories, aimed at developing key technologies for the construction of a multi-megawatt protonlinac based on state-of-the-art RF superconducting technology, which would serve as a driver for new physicsfacilities such as neutrinos and Radioactive Ion Beam (RIB). Amongst the main objectives of this R&D effort,is the development of 704 MHz bulk niobium β=1 elliptical cavities, operating at 2 K with a maximum accel-erating field of 25 MV/m, and the testing of a string of cavities integrated in a machine-type cryomodule. Thecavity together with its helium tank had to be carefully designed in coherence with the innovative design of thecryomodule. New fabrication methods have also been explored. Five such niobium cavities and two coppercavities are under manufacturing under CERN responsibility. The key design aspects are discussed, the resultsof the alternative fabrication methods are presented and the status of the cavity manufacturing is detailed.

MOPB076 Design and Analysis of Medium Beta Five-Cell Superconducting RF Linac Cavity – S.S. Som (DAE/VECC),R.K. Bhandari, P. Bhattacharyya, A. Dutta Gupta, S. Ghosh, A. Mandal, S. Saha, S. Seth (DAE/VECC)The Superconducting RF technologies have advanced significantly in last few decades throughout the worldand consequently SRF cavity with high accelerating gradient has become almost the unanimous choice for thefuture energy frontier linear accelerators. Department of Atomic Energy (DAE) has been pursuing for build-ing Spallation Neutron Source (SNS) and also Accelerator Driven Subcritical System (ADSS) as the long termprojects in India. In this regard, research and development activities for the SRF cavities have been initiatedin various DAE laboratories. This paper describes about the design and analysis of five-cell medium beta SRFLinac cavity structures at the fundamental operating frequency of 650 MHz along with the comparative studybetween different shapes. Besides electromagnetic design, the mechanical analysis of the cavity has also beentouched upon. Also, the preliminary design study for the blade tuner of the said SRF cavity has been discussedin this paper.

MOPB077 Lorentz Force Compensation for Long Pulses in ILC type SRF Cavities – N. Solyak (Fermilab), G.I. Cancelo,B. Chase, Y.M. Pischalnikov, W. Schappert (Fermilab)Project-X 3-8 GeV pulsed linac is based on ILC type 1.3 GHz elliptical cavities. The cavity will operate at 25MV/m accelerating gradient, but in contrast with XFEL and ILC projects the required loaded Q is much higher(Q=107) and RF pulse is much longer (∼8ms). For these parameters Lorence force detuning (LFD) and micro-phonics should be controlled at the level <30 Hz. A new algorithm of LFD compensation, developed at Fer-milab for ILC cavities was applied for Lorentz force compensation studies for 8ms pulses. In these studies twocavities inside TESLA-type cryomodule at Fermilab NML facility have been powered by one klystron. Studiesdone for different cavity gradients and different values of loaded Q demonstrated that required compensationare achievable. Detuning measurements and compensation results are presented.

MOPB078 High Q Studies for Nb Cavities: Heat Treatments and NbN R&D at FNAL – A. Grassellino (Fermilab), D.J. Bice,A.C. Crawford, A. Romanenko, A.M. Rowe, M. Wong (Fermilab)The recent focus on SRF CW applications calls for R&D effort towards high quality factors of Nb resonators ataccelerating fields up to 20 MV/m. In this contribution we present the results of studies at Fermilab which aimat maximizing Q: these studies involve high T treatments in UHV and chemistry (HF rinsing) in the quest forthe ’best Q recipe’ at different field levels, operating T and frequency. Studies include also the formation of aniobium nitride layer via bulk diffusion, with different purposes:

• to create a capping layer to prevent hydrogen reabsorption,

• to create a layer of a different SC with higher critical T and critical fields, which can potentially lead tomuch lower surface resistance than Nb.

MOPB079 Normal Conducting Deflecting Cavity Development at the Cockcroft Institute – G. Burt (Cockcroft Institute,Lancaster University), P.K. Ambattu, A.C. Dexter (Cockcroft Institute, Lancaster University) S.R. Buckley, P. Goud-ket, C. Hill, P.A. McIntosh, A.E. Wheelhouse (STFC/DL/ASTeC) R.M. Jones (UMAN)Two normal conducting deflecting structures are currently being developed at the Cockcroft Institute, one as acrab cavity for CLIC and one for bunch slice diagnostics on low energy electron beams for EBTF at Daresbury.Each has its own challenges that need overcome. For CLIC the phase and amplitude tolerances are very strin-gent and hence beamloading effects and wakefields must be minimised. Significant work has been undertookto understand the effect of the couplers on beamloading and the effect of the couplers on the wakefields. ForEBTF the difficulty is avoiding the large beam offset caused by the cavities internal deflecting voltage at the lowbeam energy. Propotypes for both cavities have been manufactured and results will be presented.

MOPB080 Status of the C-Band RF System for the SPARC-LAB High Brightness Photoinjector – R. Boni (INFN/LNF),D. Alesini, M. Bellaveglia, G. Di Pirro, M. Ferrario, A. Gallo, B. Spataro (INFN/LNF) A. Mostacci, L. Palumbo(URLS)The high brightness photoinjector in operation at the SPARC-LAB facility of the INFN-LNF, Italy, consists of a150 MeV S-band electron accelerator aiming to explore the physics of low emittance high peak current electronbeams and the related technology. Velocity bunching techniques, SASE and Seeded FEL experiments havebeen carried out successfully. To increase the beam energy and improve the performances of the experiments,


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it was decided to replace one S-band travelling wave accelerating cavity, with two C-band cavities that allow toreach higher energy gain per meter. The new C-band system is in a well advanced development phase and willbe in operation early in 2013. The main technical issues of the C-band system and the R&D activities carriedout till now are illustrated in detail in this paper.

MOPB081 Travelling Wave Structures with a Large Phase Advance – V.V. Paramonov (RAS/INR)The electrons acceleration is considered in higher pass bands of TM01 wave for disk loaded waveguide, result-ing in the possibility of traveling wave accelerating structures with an operating field phase advance between180 – 1260 degrees per cell. With an appropriate shape optimization and some additional elements in cellsproposed traveling wave structures have small transverse dimensions and high RF efficiency of standing waveoperation. Examples of proposed structures together with RF and dispersion properties are presented.

MOPB082 RF Parameters of the TE- type Deflecting Structure for S-band frequency Range – V.V. Paramonov (RAS/INR),L.V. Kravchuk (RAS/INR) K. Flöttmann (DESY)Effective compact deflecting structure* has been proposed for L-band frequency range preferably. RF param-eters of this structure considered for S-band frequency range both for traveling and standing wave operation.

MOPB083 Operational experience with the FERMI@Elettra S-band RF System – A. Fabris (ELETTRA), C. Serpico (ELET-TRA)FERMI@Elettra is a single-pass linac-based FEL user-facility covering the wavelength range from 100 nm (12eV) to 4 nm (310 eV) and is located next to the third generation synchrotron radiation facility Elettra in Tri-este, Italy. The machine is presently under commissioning and the first FEL line (FEL-1) will be opened to theusers by the end of 2012. The 1.5 GeV linac is based on S-band technology. The S-band system is composedof fifteen 3 GHz 45 MW peak RF power plants powering the gun, eighteen accelerating structures and the RFdeflectors. The S-band system has been set into operation in different phases starting from the second half of2009. This paper provides an overview of the performance of the system, discussing the achieved results, thestrategies adopted to assure them and possible upgrade paths to increase the operability and safety margins ofthe system.

MOPB084 Design of a C-band Disk-load Type Accelerating Structure for a Higher Pulse Repetition Rate in the SACLAAccelerator. – T. Sakurai (RIKEN SPring-8 Center), T. Inagaki, Y. Otake (RIKEN SPring-8 Center) H. Ego (JASRI/SPring-8)The higher pulse repetition rate of the SACLA accelerator provides a higher rate of X-ray laser pulses to expandability of user experiments, such as simultaneously providing the laser to several beamlines and reducing ameasuring time in the experiment. Therefore, we studied on a C-band accelerating structure for a higher pulserate above 120 pps than that of the present case of 60 pps. The designed structure adopts a TM01-2π/3 modedisk-loaded type with a quasi-constant gradient . Since higher repetition rate operation is inclined to increasea number of vacuum electrical discharges, it is required to reduce the surface electric field in the structure. Wedesigned an ellipsoidal curvature shape around an iris aperture, which reduces the maximum surface field by20%. Since the higher repetition rate also increases the heat load of the structure, in simulation, we optimizedcooling channels to obtain acceptable frequency detuning. As the results of the design, an accelerating gradi-ent of more than 40 MV/m will be expected, when an input RF power of 80 MW is applied to the structure. Inthis paper, we report the design of the C-band accelerating structure and its rf properties.

MOPB085 Update on High Power Tests of Single Cell Standing Wave Structures at SLAC – V.A. Dolgashev (SLAC),S.G. Tantawi, A.D. Yeremian (SLAC) Y. Higashi (KEK) B. Spataro (INFN/LNF)We report results of ongoing high power tests of single cell standing wave structures. These tests are part ofan experimental and theoretical study of rf breakdown in normal conducting structures at 11.4 GHz. The goalof this study is to determine the accelerating gradient capability of normal-conducting rf powered particle ac-celerators. The test setup consists of reusable mode-launchers and short test structures powered by SLAC’sXL-4 klystron. We have tested structures of different geometries, cell joining techniques, and materials, in-cluding copper structures with molybdenum and stainless steel irises. In previous experiments we found thatthe breakdown rate is correlated more with peak surface pulse heating than with the peak surface electric field.In recent experiments we changed the geometry to decouple the peak pulse heating and peak Poynting vector.As a result we observed that the breakdown rate correlated more with peak Poyning vector.

MOPB086 The Nonresonant Perturbation Theory Based Field Measurement and Tuning of Linac Accelerating Struc-ture – W. Fang (SINAP), Q. Gu, Z.T. Zhao (SINAP) D.C. Tong (TUB)Assisted by the bead pull technique, the nonresonant perturbation theory is applied for measuring and tuningthe field of the linac accelerating structure. The method is capable of making non-touch measurement, am-plitude and phase diagnostics, real time mismatch feedback and field tuning. Main considerations on mea-surement system and of C-band traveling-wave structure are described, the bead pull measurement and thetuning of the C-band traveling-wave linac accelerating structure are presented.


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MOPB087 S-Band Loads for SLAC Linac – A. Krasnykh (SLAC), F.-J. Decker (SLAC) R.W. LeClair (INTA)The S-Band loads on the current SLAC linac RF system were designed, in some cases, 40+ years ago to terminate8-10 MW peak power using 200 micrometers of coated Kanthal material as the high power absorber [1]. Atechnology of the load design was based on a flame-sprayed Kanthal wire method onto a base material. Thistechnology was employed to create the RF power absorption layer. During the SLAC linac upgrades, the 20 MWpeak klystrons were replaced by 5045 klystrons with 65+ MW peak output power. Additionally, SLED cavitieswere introduced and as a result, the peak power in the current RF setup is increased up to 240 MW peak. Theproblem of reliable RF peak power termination and RF load lifetime required a careful study and adequatesolution. Results of our studies and two designs of S-Band Load for the present SLAC RF Linac system will bedescribed in presentation. These two designs are based on the use of low conductivity materials.

MOPB088 Fabrication Test for IMP 162.5 MHz RFQ – B. Zhang (IMP)The RFQ for one of front ends of C-ADS is designed. The frequency of the RFQ is 162.5 MHz and the energyis 2.1 MeV. The beam intensity is 15 mA and it works at CW mode. Because of low frequency, the four-wingstructure is big size. It makes fabrication will take more risks. Therefore, four fabrication testing were plannedand done to minimize the technic risks. The description about fabrication and testing results are presented inthe paper.

04 Extreme Beams, Sources and Other TechnologiesMOPB089 Local Energy Spectrum Measurement on Tsinghua Thomson Scattering X-ray Source – Y.-C. Du (TUB),

Hua„J.F. Hua, W.-H. Huang, C.-X. Tang, L.X. Yan, Z. Zhang (TUB)Thomson scattering X-ray source, in which the TW laser pulse is scattered by the relativistic electron beam, canprovide ultra short, monochromatic, high flux, tunable polarized hard X-ray pulse which is can widely used inphysical, chemical and biological process research, ultra-fast phase contrast imaging, and so on. Since thepulse duration of X-ray is as short as picosecond and the flux in one pulse is high, it is difficult to measure thex-ray spectrum. In this paper, we present the X-ray spectrum measurement experiment on Tsinghua Thomsonscattering. The preliminary experimental results shows the maximum X-ray energy is about 47 keV, which isagree well with the simulations.

03 TechnologyMOPB090 FRIB Technology Demonstration Cryomodule Test – J. Popielarski (FRIB), E.C. Bernard, A. Fila, L.L. Harle,

M. Hodek, L. Hodges, S. Jones, D. Morris, K. Saito, N.R. Usher, J. Weisend, J. Wlodarczak (FRIB) A. Facco (INFN/LNL) M. Klaus (Technische Universität Dresden)A Technology Demonstration Cryomodule (TDCM) has been developed for a systems test of technology beingdeveloped for FRIB. The TDCM consists of two half wave resonators (HWRs) which have been designed foran optimum velocity of β=v/c=0.53 and a resonant frequency of 322 MHz. The resonators operate at 2 K. Asuperconducting 9 T solenoid is placed in close proximity to one of the installed HWRs. The 9 T solenoidoperates at 4 K. A complete systems test of the cavities, magnets, and all ancillary components is presented inthis paper.

MOPB091 The Injector Cryomodule for the ARIEL e-Linac at TRIUMF – R.E. Laxdal (TRIUMF, Canada’s National Lab-oratory for Particle and Nuclear Physics), A. Koveshnikov, N. Muller, W.R. Rawnsley, G. Stanford, V. Zvyagint-sev (TRIUMF, Canada’s National Laboratory for Particle and Nuclear Physics) M. Ahammed, M. Mondrel (DAE/VECC)The ARIEL project at TRIUMF includes a 50 MeV-10 mA electron linear accelerator (e-Linac) using 1.3 GHz su-perconducting technology. The accelerator is divided into three cryomodules including a single cavity injectorcryomodule (ICM) and two accelerating cryomodules with two cavities each. The ICM is being built first. TheICM utilizes a unique top-loading box vacuum vessel. The shape allows the addition of a 4 K/2 K cryogenic unitthat accepts near atmospheric LHe and converts to 2 K liquid inside the cryomodule. The cryomodule designis complete and in fabrication. The 4 K/2 K cryogenic unit has been assembled and tested in a test cryostat.The paper will describe the design of the cryomodule and the results of the cryogenic tests.

MOPB092 Cryogenic System Improvements for the ATLAS Intensity Upgrade – S.W.T. MacDonald (ANL)The ATLAS accelerator is the world’s first superconducting linear accelerator for heavy ions. It is a national userfacility supported by the U.S. Office of Nuclear Physics and the Department of Energy. ATLAS employs vari-ous types of superconducting radiofrequency (SRF) cavities housed in 14 cryostats to accomplish its mission.These cryostats are cooled either in parallel or series by three CTI model 2800 refrigerators supplying liquidhelium at 30 grams per second each at 4.7 K. As part of an intensity upgrade funded by the American Recoveryand Reinvestment Act (ARRA), ATLAS will replace twelve split-ring type SRF cavities housed in two cryostatswith a single cryostat housing seven quarter wave type SRF cavities. Although the upgrade results in fewer cav-ities, the total 4.7 k heat load increases by a factor of two. The ATLAS Cryogenic Distribution System (CDS) willbe modified to accommodate this increase by optimizing liquid helium distribution and component thermalefficiency. Further improvements to the CDS system will be accomplished by improving the distribution ofcool down streams. This paper will provide an overview of the project goals and the expected benefits.


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04 Extreme Beams, Sources and Other TechnologiesMOPB093 The Upgraded Argonne Wakefield Accelerator Facility (AWA): a Test-Bed for the Development of High Gradi-

ent Accelerating Structures and Wakefield Measurements – M.E. Conde (ANL), D.S. Doran, W. Gai, R. Konecny,W. Liu, J.G. Power, Z.M. Yusof (ANL) S.P. Antipov, C.-J. Jing (Euclid TechLabs, LLC) E.E. Wisniewski (Illinois Insti-tute of Technology)Electron beam driven wakefield acceleration is a bona fide path to reach high gradient acceleration of elec-trons and positrons. With the goal of demonstrating the feasibility of this concept with realistic parameters,well beyond a proof-of-principle scenario, the AWA Facility is currently undergoing a major upgrade that willenable it to achieve accelerating gradients of hundreds of MV/m and energy gains on the order of 100 MeV perstructure. A key aspect of the studies and experiments carried out at the AWA facility is the use of relativelyshort RF pulses (15 – 25 ns), which is believed to mitigate the risk of breakdown and structure damage. Theupgraded facility will utilize long trains of high charge electron bunches to drive wakefields in the microwaverange of frequencies (8 to 26 GHz), generating RF pulses with GW power levels.

02 Proton and Ion Accelerators and ApplicationsMOPB094 Simulation Study on the Longitudinal Bunch Shape Measurement by RF Chopper at J-PARC Linac –

T. Maruta (JAEA/J-PARC) M. Ikegami (J-PARC, KEK & JAEA)A RF chopper is placed in the medium energy transport section (MEBT1) at J-PARC linac. The chopper is nor-mally driven at synchronous phase of 0 degree to give a maximum deflection. The chopper has two RF gapsand both of them deflect a beam bunch horizontally while RF is on. In the MEBT1 section, while we have atransverse emittance monitor, there is no longitudinal monitor. It is hard to newly place a longitudinal beammonitor there due to space limitation. We conduct a simulation which studies on the usability of the chopperto a longitudinal beam monitor. When the synchronous phase of the chopper is ± 90 degree, the longitudi-nal beam profile is projected to horizontal beam distribution. In this presentation, we introduce simulationresults.

MOPB095 Design of MEBT for the Project X Injector Experiment at Fermilab – A.V. Shemyakin (Fermilab)The Project X Injector Experiment (PXIE), a test bed for the Project X front end, will be completed at Fermilabat FY12-16. One of the challenging goals of PXIE is demonstration of the capability to form a 1 mA H- beamwith an arbitrary selected bunch pattern from the initially 5 mA 162.5 MHz CW train. The bunch selectionwill be made in the Medium Energy Beam Transport (MEBT) at 2.1 MeV by diverting undesired bunches to anabsorber. This paper will present the MEBT scheme and describe development of its elements, including thekickers and absorber.

MOPB096 Beam Loss Mitigation in J-PARC Linac after the Tohoku Earthquake – M. Ikegami (KEK)The beam operation of J-PARC linac was interrupted by the Tohoku earthquake in March 2011. After signifi-cant effort for its restoration, we have resumed the beam operation of J-PARC linac in December 2011. Afterresumption of beam operation, we have been suffering from beam losses which were not observed before theearthquake. Tackling with the beam loss issues, we have been reached the comparable beam power for useroperation to the one before the earthquake. In this paper, we present the experience in the beam start-uptuning after the earthquake with emphasis on the beam loss mitigation efforts.

MOPB098 Transverse Emittance Transfer at the GSI UNILAC Through Eigen-Emittance Shaping – C. Xiao (IAP),O.K. Kester (IAP) L. Groening (GSI)The minimum transverse emittances achievable in a beam line are determined by the two transverse eigen-emittances of the beam. For vanishing interplane correlations they are equal to the transverse rms-emittances.Eigen-emittances are constants of motion for all symplectic beam line elements, i.e. (even tilted) linear ele-ments. To allow for rms-emittance transfer, the eigen-emittances are changed by a non-symplectic action tothe beam, preferably preserving the 4d-rms-emittance. Unlike emittance swapping the presented conceptwill allow transforming a beam of equal rms-emittances into a beam of different rms-emittances while pre-serving the 4d-rms-emittance. This contribution will introduce the concept for eigen-emittance shaping andrms-emittance transfer at an ion linac. The actual work status towards the experimental demonstration of theconcept at the GSI UNILAC is presented.

MOPB099 Genetic Algorithms for Accelerating Structure Optimization of Independently Phased Cavities andSolenoids – A.V. Samoshin (MEPhI)At present many accelerators in the world are developing using modular configuration. Short identical nio-bium cavities for beam acceleration and focusing solenoids are used for a number of SC high energy linacsunder development and construction. Accelerating system consists of a large number of identical elements.These linacs have many free parameters for a large number of cavities, which can be used for linac tuning toaccelerate different types of particles from hydrogen to uranium. A stable particle motion in the whole accel-erator can be provided by specific phasing of RF cavities. The effective particles acceleration with differentcharge-to-mass ratio is possible with a special choice of the amplitude and phase of the RF field of each cavity.Moreover, for each ion’s type optimal operating parameters of the system can be chosen by numerical sim-ulation. The using of Genetic Algorithms (GA) – optimization technique is ideally suited to search for globaloptima in a large multi-dimensional solution space is propose to solve this problem.


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TU1A — Invited Oral PresentationsChair: A. Facco (INFN/LNL)

02 Proton and Ion Accelerators and ApplicationsTU1A01

08:30Status of the IFMIF-EVEDA 9 MeV 125 mA Deuteron Linac – A. Mosnier (CEA)The scope of IFMIF/EVEDA has been recently revised to set priority on the validation activities, especiallyon the Accelerator Prototype (LIPAc) with extending the duration up to mid 2017 in order to better fit thedevelopment of the challenging components and the commissioning of the whole accelerator. The presentstatus of LIPAc, currently under construction at Rokkasho in Japan, outlines of the engineering design and ofthe developments of the major components will be reported. In conclusion, the expected outcomes of theengineering work, associated with the experimental program will be presented.

TU1A0209:00

Status of Fermilab Project X – S. Nagaitsev (Fermilab), S. Henderson (Fermilab)Project X, a high-power proton facility, will support world-leading programs in long base line neutrino physics,the physics of rare processes, and nuclear studies. It will be unique among accelerator facilities worldwide inits flexibility to support multiple physics programs simultaneously with MW class beams at the intensity fron-tier. Project X is based on a 3 GeV continuous-wave superconducting H- linac. Further acceleration to 8 GeV,and injection into Fermilab’s existing Recycler/Main Injector complex, will support long-baseline neutrino ex-periments. Project X will provide ∼3 MW of total beam power to the 3 GeV program, simultaneously with ≥2 MW to a neutrino production target at 60-120 GeV. This talk will describe the Reference Design of Project Xand status of the R&D program.

TU1A0309:20

Chinese ADS Project and Proton Accelerator Devekopment – W.M. Pan (IHEP)Interest in the feasibility of ADS has increased dramatically in the last decade. This talk will briefly introducethe technologies presently available for ADS applications and provide a review of the ongoing R&D and con-struction activities in China, with particular emphasis on the challenges presented by the development of ahigh intensity, SRF CW proton Linac.

TU1A0409:40

FRIB Accelerator Status and Challenges – J. Wei (FRIB), E.C. Bernard, N.K. Bultman, F. Casagrande, S. Chou-han, C. Compton, K.D. Davidson, A. Facco, P.E. Gibson, T . Glasmacher, K. Holland, M.J. Johnson, S. Jones, D. Leit-ner, M. Leitner, G. Machicoane, F. Marti, D. Morris, J.P. Ozelis, S. Peng, J. Popielarski, L. Popielarski, E. Pozdeyev,T. Russo, K. Saito, R.C. Webber, M. Williams, Y. Yamazaki, A. Zeller, Y. Zhang, Q. Zhao (FRIB) D. Arenius, V. Ganni(JLAB) J.A. Nolen (ANL)The Facility for Rare Isotope Beams (FRIB) at MSU includes a driver linac that can accelerate all stable iso-topes to energies beyond 200 MeV/u at beam powers up to 400 kW. The linac consists of 330 superconductingquarter- and half-wave resonators operating at 2 K temperature. Physical challenges include acceleration ofmultiple charge states of beams to meet beam-on-target requirements, efficient production and accelerationof intense heavy-ion beams from low to intermediate energies, accommodation of multiple charge strippingscenarios (liquid lithium, helium gas, and carbon foil) and ion species, designs for both baseline in-flight frag-mentation and ISOL upgrade options, and design considerations of machine availability, tunability, reliability,maintainability, and upgradability. We report on the FRIB accelerator design and developments with emphasison technical challenges and progress.

TU1A0510:00

Status and Commissioning Plan of the PEFP 100-MeV Linear Accelerator – H.-J. Kwon (KAERI), Y.-S. Cho,J.-H. Jang, D.I. Kim, H.S. Kim, B.-S. Park, J.Y. Ryu, K.T. Seol, Y.-G. Song, S.P. Yun (KAERI)One of the goals of the Proton Engineering Frontier Project (PEFP) is to develop a 100 MeV proton linear ac-celerator, which consists of 50 keV proton injector, 3 MeV radio frequency quadrupole (RFQ), 20 MeV/100MeV drift tube linac (DTL) and 20 MeV/100 MeV beam lines. The 100 MeV linear accelerator and beam linecomponents have been installed in the tunnel and experimental hall. After the completion of the utility com-missioning, the commissioning of the accelerator starts with a goal of the beam delivery to the 100 MeV targetroom located at the end of the beam line in 2012. In this paper, the status and commissioning plan of the PEFP100 MeV linear accelerator are presented.


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TU2A — Invited Oral PresentationsChair: Y.H. Chin (KEK)

01 Electron Accelerators and ApplicationsTU2A01

10:50Review of FEL Projects – J.N. Corlett (LBNL)This talk will review the status of FELs in operation and proposals for major FEL facilities in the world.

TU2A0211:20

Overview of SACLA Machine Status – Y. Otake (RIKEN SPring-8 Center)SACLA of an X-ray free-electron laser has been constructed and was successfully lased at 0.06 nm in 2011.SACLA mainly comprises a low-emittance thermionic electron gun, an 8-GeV linear accelerator using C-band(5712 MHz) cavities and 18 in-vacuum undulators. The concept to develop this machine is compactness com-pared with the other machine, such as LCLS with the length of more than 1 km. Stable X-ray lasing up to 0.06nm as also the concept demands extreme stable accelerator components, such as 50 fs temporal stability at acavity in an injector. We now realized a 700 m compact machine by a low-emittance at the electron gun, anaccelerating gradient of more than 35 MV/m with the C-band accelerator, and the short-period undulators.The continuous lasing for more than several days is strongly supported by these stable components and smalloperator‘s trimming, and also established by reduction of perturbation sources to laser instability. SACLA isregularly operated for user experiments, such as the imaging with extreme amount of data. This presentationintroduces the machine performance, the reduction of the perturbation sources and the operation of SACLA.

TU2A0311:40

LCLS Operation Experience and LCLS-II Design – T.O. Raubenheimer (SLAC), J.N. Galayda (SLAC)This talk will report the operations experience at LCLS and will describe the LCLS-II, a new X-ray FEL facilitythat uses the middle 1/3 of the SLAC linac as compared to the LCLS which uses the last 1/3 of the SLAC linac.

TU2A0412:00

High Current ERL at BNL – I. Ben-Zvi (BNL)The electron hadron collider eRHIC will collide polarized and unpolarized electrons with a current of 50 mAand energy in the range of 5 GeV to 30 GeV with hadron beams, including heavy ions or polarized light ions ofthe RHIC storage ring. The electron beam will be generated in an energy recovery linac contained inside theRHIC tunnel, comprising six passes through two linac section of about 2.5 GeV each. The electron ERL posesmany challenges in term of a high-current high-polarization electron gun, HOM damping in the linac, crabcavities, harmonic cavities and beam stability.


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TU3A — Invited Oral PresentationsChair: G. Apollinari (Fermilab)

03 TechnologyTU3A01

13:30Synchronization of Accelerator Sub-systems with Ultimate Precision – H. Schlarb (DESY)Precise synchronization of accelerator sub-systems such as LLRF stations, gun or seeding lasers, is a pre-requisite for the successful operation of modern linear accelerators. The synchronization demand is oftenbelow 10 fs. Using examples like FLASH at DESY, the European XFEL, or different seeding proposals and stud-ies, a general overview should be given.

TU3A0213:50

Advances in Photonic and Metamaterial RF structures – R. Seviour (University of Huddersfield)Interest in the use of novel electromagnetic media for particle acceleration and EM wave generation is growing.In part driven by the possibility to overcome limiting issues in conventional technologies, and offer novel waysin which to accelerate particles. Photonic media can confine a single EM frequency whilst forcing all other fre-quencies to propagate away, significantly reducing the long range wakefield of a structure. The novel disper-sion curves of metamaterials define unique particle-wave interactions enabling compact inverse Cherenkovacceleration. In this presentation we examine the use of photonic media and metamaterials for RF genera-tion and particle acceleration. We review the physical processes and defining length scales, energy exchangemechanisms, examining the advantages offered by these media and the issues that can arise from their use.

04 Extreme Beams, Sources and Other TechnologiesTU3A03

14:10First Electron Beam Ooperation of the LANL NCRF Photoinjector – N.A. Moody (LANL)The first ever photoelectron beam from a cw normal-conducting radio-frequency (NCRF) injector has beenobserved. The NCRF injector at Los Alamos has produced its first continuous-wave photoelectron beam atenergy up to 2 MeV and average current of a few mA. Accelerating gradients up to 10 MV/m at the cathodewere confirmed with end-point x-ray energy measurements. The photoelectron beams were produced usingboth a continuous-wave blue laser diode and a cw modelocked green laser irradiating thin films of CsK2Sbphotocathodes deposited on a copper substrate. Both photocurrent and dark current were measured via a cal-ibrated wall-current monitor, sensitive to a few µA levels. Preparation of CsK2Sb photocathodes using chemi-cal vapour deposition in an ultrahigh vacuum chamber and photocathode transfer to the NCRF injector will bedescribed. We will also show the importance of the RF contact between the photocathode plug and the NCRFinjector backplate for successful cw operation at high power.

TU3A0414:30

Electron Beam Current-profile Shaping via Transverse-to-longitudinal Phase-space Exchange – Y.-E. Sun(Fermilab)Tunable subpicosecond electron bunch trains are experimentally demonstrated at the A0 photoinjector at Fer-milab. In this talk, we report our experiment on electron beam current-profile shaping using a transverse-to-longitudinal phase-space exchange technique. An initial beam consisting of a set of horizontally-separatedbeamlets passes through a beamline that exchanges the horizontal and longitudinal phase spaces, thus thebeam is converted into a train of bunches temporally separated with tunable bunch duration and separation.By choosing proper initial horizontal density profiles, other types of beam current-profile shaping are possible,such as the preferred triangle-shape in wake field acceleration experiments.


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11-Sep-12 14:50 – 15:50 Oral Hall B

TUPLB — Poster Orals

01 Electron Accelerators and ApplicationsTUPLB01

14:50The Swiss FEL RF Gun: RF Design and Thermal Analysis – J.-Y. Raguin (Paul Scherrer Institut), M. Bopp,A. Citterio, A. Scherer (Paul Scherrer Institut)We report here on the design of a dual-feed S-band 2.5 cell RF gun, developed in the framework of SwissFEL,capable of operating at 100 Hz repetition rate. As in the LCLS RF gun, z-coupling, to reduce the pulsed surfaceheating, and a racetrack coupling cell shape, to minimize the quadrupolar component of the fields, have beenadopted. The cell lengths and the iris thicknesses are as in the PHIN gun operating at CERN. However theirises aperture has been enlarged to obtain a frequency separation between the operating π mode and the π/2mode higher than 15 MHz. An amplitude modulation scheme of the RF power, which allows one to obtain aflat plateau of 150 ns for multibunch operation and a reduced average power is presented as well. With an RFpulse duration of 1µs it is shown that operation at 100 MV/m and 100 Hz repetition rate is feasible with veryreasonable thermal stresses.

TUPLB0214:55

Deflecting Structures with Minimized Level of Aberrations – V.V. Paramonov (RAS/INR)Deflecting structures are now widely used for bunch phase space manipulations either in bunch rotation forspecial bunch diagnostic or in emittance exchange experiments. As a tool for manipulation, the structure itselfshould provide the minimal phase space perturbations due to non linear additives in the field distribution.Even if the field of synchronous harmonic is aberration free, the higher space harmonics provide significantnon linear additives in the field distribution, leading to emittance growth during phase space manipulation.Criterion of the field quality estimation is developed and deflecting structures are considered for minimizationof non linear additives. Examples with almost aberration free total field distributions are presented.

TUPLB0315:00

sFLASH – Direct FEL Seeding - First Results – J. Bödewadt (Uni HH), S. Ackermann, A. Azima, M. Drescher,E. Hass, U. Hipp, C. Lechner, Th. Maltezopoulos, V. Miltchev, M. Mittenzwey, M. Rehders, J. Rönsch-Schulenburg,J. Roßbach, R. Tarkeshian, M. Wieland (Uni HH) S. Bajt, H. Delsim-Hashemi, S. Düsterer, K. Honkavaara, T. Laar-mann, H. Schlarb, S. Schreiber, L. Schroedter, M. Tischer (DESY) F. Curbis (MAX-lab) R. Ischebeck (Paul ScherrerInstitut) S. Khan (DELTA)Free-electron lasers operated in the soft- and hard X-ray spectral range like LCLS, SACLA and FLASH are basedon the SASE-principle. The spectrum of the amplified radiation underlies statistical fluctuations due to thestochastic nature of the start-up process from shot noise. Using external laser pulses to seed the FEL processwill give the possibility to stabilize the FEL radiation spectrally. Different schemes of external laser seeding arepossible. All schemes have in common that the external laser pulses will be intrinsically synchronized withthe FEL pulses, thus giving the possibility for pump-probe experiments with highest temporal resolution onlylimited by the individual pulse lengths. At FLASH an experimental setup to test the feasibility for direct FELseeding using radiation from a high-harmonic generation (HHG) source as the external seed source was in-stalled in 2010 (sFLASH). First tests were performed in spring 2011. After an upgrade of the drive laser systemfirst seeding at 38 nm wavelength has been demonstrated recently.

TUPLB0415:05

Results of Testing of Multi-beam Klystrons for the European XFEL – V. Vogel (DESY), A. Cherepenko,S. Choroba, I. Harders, J. Hartung (DESY) L. Butkowski (TUL-DMCS)For the European XFEL multi-beam klystrons, which can produce RF power of 10 MW at an RF frequency of1.3 GHz, at 1.5 ms pulse length and 10 Hz repetition rate, were chosen as RF power sources. Twenty-seven ofhorizontal multi-beam klystrons (MBK) together with connection modules (CM) will be installed in the XFELunderground tunnel. The CM will be installed on the MBK and connects the MBK to the pulse transformerwith only one HV cable, because the CM has a filament transformer inside as well as all diagnostics for HV andcathode current measurements. MBK prototypes together with CM prototypes have been tested for long timeat a test stand at DESY, about 3000 hours of operation for each of horizontal MBK with full RF output power,full pulse length and repetition rate of 10 Hz. Testing of first MBKs from series production has been started. Inthis paper we will give an overview of the test procedure, summarize the current test results and we will give acomparison of the most important parameters.

TUPLB0515:10

First Demonstration of Optical Frequency Shot-noise Suppression in Relativistic Electron-beams – A. Gover(University of Tel-Aviv, Faculty of Engineering), E. Dyunin (University of Tel-Aviv, Faculty of Engineering)A. Nause (University of Tel Aviv)We report first demonstration of optical frequency current shot-noise suppression in a relativistic e-beam.This process is made possible by collective Coulomb interaction between the electrons of a cold intense beamduring beam drift, and is essentially a process of longitudinal beam-plasma oscillation [1]. Suppression ofbeam current noise below the classical “shot-noise” level has been known in the microwave tubes art [2]. Thisis the first time that it is demonstrated in the optical regime. We predict that the scheme can be extendedto the XUV and possibly to shorter wavelengths with further development of technology. The fundamentalcurrent shot-noise determines the level of incoherent spontaneous radiation emission from electron-beamoptical radiation sources and SASE-FELs [3]. Suppressing shot-noise would make it possible to attain sponta-neous emission sub-radiance [4] and surpass the classical coherence limits of seed-injected FELs. The effectwas demonstrated by measuring sub-linear growth as a function of current of the OTR Radiation. This findingindicates that the beam charge homogenizes due to the collective interaction, and its distribution becomessub-Poissonian.


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02 Proton and Ion Accelerators and ApplicationsTUPLB06

15:15Status of the Rare Isotope Science Project in Korea – J.-W. Kim (NCC, Korea) Y. Chung, D. Jeon, S.K. Kim (IBS)E.-S. Kim (KNU)A heavy-ion accelerator facility is being designed in Korea for the production of rare isotope beams under thename of rare isotope science project (RISP). The project is funded and officially started in Jan. 2012. The accel-erator complex is composed of three main accelerators: a superconducting linac to use in-flight fragmentation(IF) method in generating isotope beams, a 70 kW proton cyclotron for the ISOL method, and a superconduct-ing post accelerator for re-acceleration of rare isotope beams to the energy range of 18 MeV/u. The minimumenergy of a U beam required for the IF driver is 200 MeV/u at the beam power of 400 kW. The beam current of Uions in high charge states is limited by the performance of existing ECR ion sources. This facility will be uniquein the aspect that state-of-art accelerators are facilitated for both the IF and ISOL drivers and combined toproduce extreme exotic beams. Also, standalone operation of each accelerator will allow us to accommodatediverse users from beam application fields as well as nuclear physics. The current status of the design effortswill be presented.

TUPLB0715:20

Reduced-beta Cavities for High-intensity Compact Accelerators – Z.A. Conway (ANL), S.M. Gerbick,M. Kedzie, M.P. Kelly, J.W. Morgan, R.C. Murphy, P.N. Ostroumov, T. Reid (ANL)This paper reports on the development and testing of a superconducting quarter-wave and a superconductinghalf-wave resonator. The quarter-wave resonator is designed for β = 0.077 ions, operates at 72 MHz and canprovide more than 7.4 MV of accelerating voltage at the design beta, with peak surface fields of 164 mT and117 MV/m. Operation was limited to this level not by RF surface defects but by our available RF power andadministrative limits on x-ray production. A similar goal is being pursued in the development of a half-waveresonator designed for β = 0.29 ions and operated at 325 MHz.

TUPLB0815:25

R&D Towards CW Ion Linacs at ANL – P.N. Ostroumov (ANL), A. Barcikowski, Z.A. Conway, S.M. Gerbick,M. Kedzie, M.P. Kelly, S.V. Kutsaev, J.W. Morgan, R.C. Murphy, B. Mustapha, D.R. Paskvan, T. Reid, D.L. Schrage,S.I. Sharamentov, K.W. Shepard, G.P. Zinkann (ANL)The accelerator development group in ANL’s Physics Division has engaged in substantial R&D related to CWproton and ion accelerators. Particularly, a 4 meter long 60.625 MHz CW RFQ has been developed, built andis being commissioned with beam. Development and fabrication of a cryomodule with seven 72.75 MHzquarter-wave cavities is complete and it is being assembled. Off-line testing of several QWRs has demon-strated outstanding performance in terms of both accelerating voltage and surface resistance. Both the RFQand cryomodule were developed and built to upgrade ATLAS to higher efficiency and beam intensities. An-other cryomodule with eight 162.5 MHz SC HWRs and eight SC solenoids is being developed and built forProject X at FNAL. We are also developing both an RFQ and cryomodules (housing 176 MHz HWRs) for pro-ton & deuteron acceleration at SNRC (Soreq, Israel). In this paper we discuss ANL-developed technologies fornormal-conducting and SC accelerating structures for medium- and high-power CW accelerators, includingthe projects mentioned above and other developments for applications such as transmutation of spent reactorfuel.

03 TechnologyTUPLB09

15:30Design and Beam Test of Six-electrode BPMs for Second-order Moment Measurement – K. Yanagida (JASRI/SPring-8), H. Hanaki, S. Suzuki (JASRI/SPring-8)In the SPring-8 linac, four-electrode beam position monitors (BPMs) have been utilized for the measurementof the transverse first-order moments, which correspond to the centroids of beam charge distributions. Wehave planed to measure the transverse second-order moments of beams to obtain information of beam opticsand its energy deviations during the top-up beam injection without destruction of beams. Therefore, six-electrode BPMs with circular and quasi-ellipse cross-sections have been developed on the basis of a newlyintroduced theory. A low-noise signal processor for the six-electrode BPM has also been developed to performfine measurement. We expected the following resolutions determined by the S/N ratio of the circuit; the firstorder moments (beam positions) > 1 µm, and the second order moments with a size > 110 µm. The first beamtest was carried out using the six-electrode BPM with circular cross-section and the old signal processor. Themeasured sensitivities and resolutions of the second-order moments showed good agreement with the theory.

TUPLB1015:35

Non-destructive, Shot-by-shot Real-time Monitor to Measure 3D Bunch Charge Distribution with a Fem-tosecond Resolution – H. Tomizawa (RIKEN SPring-8 Center), K. Ogawa, T. Sato (RIKEN SPring-8 Center)M. Aoyama (JAEA/Kansai) A. Iwasaki, S. Owada (The University of Tokyo) S. Matsubara, Y. Okayasu, T. Togashi(JASRI/SPring-8) T. Matsukawa, H. Minamide (RIKEN ASI) E. Takahashi (RIKEN)Non-destructive, shot-by-shot real-time monitors have been developed to measure 3D bunch charge distri-bution (BCD). This 3D monitor has been developed to monitor 3-D overlapping electron bunches and higherharmonic generation (HHG) pulses in a seeded VUV-FEL. This ambitious monitor is based on an Electro-Optic(EO) multiple sampling technique in a manner of spectral decoding that is non-destructive and enables real-time measurements of the longitudinal and transverse BCD. This monitor was materialized in simultaneouslyprobing eight EO crystals that surround the electron beam axis with a radial polarized and hollow EO-probelaser pulse. In 2009, the concept of 3D-BCD monitor was verified through electron bunch measurements atSPring-8. The further target of the temporal resolution is∼30 fs (FWHM), utilizing an organic EO crystal (DAST)instead of conventional inorganic EO crystals (ZnTe, GaP, etc.) The EO-sampling with DAST crystal is expectedto measure a bunch length less than 30 fs (FWHM). In 2011, the first bunch measurement with an organic EOcrystal (DAST) was successfully demonstrated in the VUV-FEL accelerator at SPring-8.


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TUPLB1115:40

Waveguide System R&D for the ILC Klystron Cluster Scheme – C.D. Nantista (SLAC), C. Adolphsen, F. Wang(SLAC)The Klystron Cluster Scheme (KCS)* was developed as a solution for powering the main linacs of an Interna-tional Linear Collider (ILC) without parallel service tunnels. It entails combining rf from groups of 20-30 ten-megawatt L-band klystrons in surface buildings into overmoded circular waveguides and plumbing it down toand along the linac tunnel. Power is then tapped off in equal fractions at intervals over roughly a kilometer tobe distributed to local groups of cavities. An R&D program was undertaken to demonstrate the feasibility ofaspects of this scheme. A 10 m run of the 0.48 m diameter TE01 mode main waveguide has been fabricated, aswell as prototypes of the coaxial tap-off (CTO)* device invented to couple power into and out of it. Cold testshave been performed, as well as pressurized high power tests, including transmission of the few megawattsavailable and resonant operation to build up peak SW fields equivalent to those of the 300 MW level TW itmight see in the ILC. We describe our components, test results and the recent expansion to a 75 m waveguiderun, including a new required TE01 90o bend, powered by a 10 MW multi-beam klystron

TUPLB1215:45

Development of Permanent Magnet Focusing System for Klystrons – Y. Fuwa (Kyoto ICR), Y. Iwashita,H. Tongu (Kyoto ICR) S. Fukuda, S. Michizono (KEK)The Distributed RF System (DRFS) for the International Linear Collider (ILC) requires thousands of klystrons.The failure rate of the power supply for solenoid focusing coil of each klystron may be a critical issue for aregular operation of the ILC. A permanent magnet beam focusing system can increase reliability and eliminatetheir power consumption. Since the required magnetic field is not high in this system, inexpensive anisotropicferrite magnets can be used instead of magnets containing rare earth materials. In order to prove its feasibility,a test model of a permanent magnet focusing beam system is constructed and a power test of the klystron forDRFS with this model is under preparation. The results of magnetic field distribution measurement and thepower test will be presented.


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11-Sep-12 15:50 – 17:50 Poster Hall B

TUPB — Poster Session

01 Electron Accelerators and ApplicationsTUPB001 The Fine Structure of the Zone for Particle Interaction with a Finite Length Periodic Structure – V.V. Para-

monov (RAS/INR)The periodic constant impedance deflecting structures are widely used for a special beam diagnostic in FEL fa-cilities. The method, based on frequency domain approach, was developed to estimate long range wake fieldsstructure parameters in a wide frequency range. It is shown, that regardless to number of cells in the structure,at each passband to the zone of particle effective interaction with the structure belongs several, at least threemodes. The usual time domain simulations provide the total estimation for loss factor or kick factor values andmodes separation in the time domain approach requires enormous simulations.

TUPB002 Deflecting Structures with Minimized Level of Aberrations – V.V. Paramonov (RAS/INR)Deflecting structures are now widely used for bunch phase space manipulations either in bunch rotation forspecial bunch diagnostic or in emittance exchange experiments. As a tool for manipulation, the structure itselfshould provide the minimal phase space perturbations due to non linear additives in the field distribution.Even if the field of synchronous harmonic is aberration free, the higher space harmonics provide significantnon linear additives in the field distribution, leading to emittance growth during phase space manipulation.Criterion of the field quality estimation is developed and deflecting structures are considered for minimizationof non linear additives. Examples with almost aberration free total field distributions are presented.

TUPB003 sFLASH – Direct FEL Seeding - First Results – J. Bödewadt (Uni HH), S. Ackermann, A. Azima, M. Drescher,E. Hass, U. Hipp, C. Lechner, Th. Maltezopoulos, V. Miltchev, M. Mittenzwey, M. Rehders, J. Rönsch-Schulenburg,J. Roßbach, R. Tarkeshian, M. Wieland (Uni HH) S. Bajt, H. Delsim-Hashemi, S. Düsterer, K. Honkavaara, T. Laar-mann, H. Schlarb, S. Schreiber, L. Schroedter, M. Tischer (DESY) F. Curbis (MAX-lab) R. Ischebeck (Paul ScherrerInstitut) S. Khan (DELTA)Free-electron lasers operated in the soft- and hard X-ray spectral range like LCLS, SACLA and FLASH are basedon the SASE-principle. The spectrum of the amplified radiation underlies statistical fluctuations due to thestochastic nature of the start-up process from shot noise. Using external laser pulses to seed the FEL processwill give the possibility to stabilize the FEL radiation spectrally. Different schemes of external laser seeding arepossible. All schemes have in common that the external laser pulses will be intrinsically synchronized withthe FEL pulses, thus giving the possibility for pump-probe experiments with highest temporal resolution onlylimited by the individual pulse lengths. At FLASH an experimental setup to test the feasibility for direct FELseeding using radiation from a high-harmonic generation (HHG) source as the external seed source was in-stalled in 2010 (sFLASH). First tests were performed in spring 2011. After an upgrade of the drive laser systemfirst seeding at 38 nm wavelength has been demonstrated recently.

TUPB004 Results of Testing of Multi-beam Klystrons for the European XFEL – V. Vogel (DESY), A. Cherepenko,S. Choroba, I. Harders, J. Hartung (DESY) L. Butkowski (TUL-DMCS)For the European XFEL multi-beam klystrons, which can produce RF power of 10 MW at an RF frequency of1.3 GHz, at 1.5ms pulse length and 10 Hz repetition rate, were chosen as RF power sources. Twenty-seven ofhorizontal multi-beam klystrons (MBK) together with connection modules (CM) will be installed in the XFELunderground tunnel. The CM will be installed on the MBK and connects the MBK to the pulse transformerwith only one HV cable, because the CM has a filament transformer inside as well as all diagnostics for HV andcathode current measurements. MBK prototypes together with CM prototypes have been tested for long timeat a test stand at DESY, about 3000 hours of operation for each of horizontal MBK with full RF output power,full pulse length and repetition rate of 10 Hz. Testing of first MBKs from series production has been started. Inthis paper we will give an overview of the test procedure, summarize the current test results and we will give acomparison of the most important parameters.

TUPB005 First Demonstration of Optical Frequency Shot-noise Suppression in Relativistic Electron-beams – A. Gover(University of Tel-Aviv, Faculty of Engineering), E. Dyunin (University of Tel-Aviv, Faculty of Engineering)A. Nause (University of Tel Aviv)We report first demonstration of optical frequency current shot-noise suppression in a relativistic e-beam. Thisprocess is made possible by collective Coulomb interaction between the electrons of a cold intense beam dur-ing beam drift, and is essentially a process of longitudinal beam-plasma oscillation.[1] Suppression of beamcurrent noise below the classical “shot-noise” level has been known in the microwave tubes art [2]. This is thefirst time that it is demonstrated in the optical regime. We predict that the scheme can be extended to theXUV and possibly to shorter wavelengths with further development of technology. The fundamental currentshot-noise determines the level of incoherent spontaneous radiation emission from electron-beam opticalradiation sources and SASE-FELs [3]. Suppressing shot-noise would make it possible to attain spontaneousemission sub-radiance [4] and surpass the classical coherence limits of seed-injected FELs. The effect wasdemonstrated by measuring sub-linear growth as a function of current of the OTR Radiation. This findingindicates that the beam charge homogenizes due to the collective interaction, and its distribution becomessub-Poissonian.

TUPB006 Stability Performance of the Injector for SACLA at SPring-8 – T. Asaka (RIKEN SPring-8 Center), T. Inagaki,H. Maesaka, T. Ohshima, Y. Otake, K. Togawa (RIKEN SPring-8 Center) T. Hasegawa (RIKEN/SPring-8) S. Taka-hashi (JASRI/SPring-8)


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To realize the SACLA, it is necessary to obtain stabilities of 10-4 and 50 fs in the amplitude and time of anacceleration voltage, respectively. The achievement of the rf stabilities were almost satisfactory for the targetvalues. Consequently, the 7 GeV beam energy stability was 0.02% (std.) or less. However, there was XFEL powervariation caused by a variation of a beam position in a 40 MeV injector section. A periodically changed beamposition of 40 µm (std.) was found out at a cycle of 2 s by Fourier transform method using BPM data. Thetemperatures of all the injector rf cavities are controlled within 28±0.04oC by a controller using the coolingwater. The AC power supplies of the controller to heat the cooling water are operated at 0.5 Hz by pulse widthmodulation control with alternatively turning on or off. The strong correlation between laser intensity varia-tion and the modulation frequency of the AC power supplies was found out. We are planning to improve thecavity temperature variation in the order of less than 0.01oC with DC power supplies to establish continuouslyregulated the cavity temperature. This plan will reduce the XFEL power variation.

TUPB007 Complete End To End Simulation in GPT – E. Danieli (Ariel University Center of Samaria, Faculty of Engineer-ing)A complete end to end simulation in GPT (general particle tracer) is presented of the beam line of an electro-static accelerator FEL, from the cathode to the collector. The current through the system is 2 A and electronsare accelerated to energies of 1.4 MeV, pulse duration duration during transport experiments is of the order of2 µs. The beam line is 13.5 m long, 4 focussing coils, 8 quadrupoles and 9 steering coils are positioned to guidethe beam as required. Comparison is made between the simulation results and experimental measurementsand differences explained.

TUPB008 Major Trends in Linac Design for X-ray FELs – A. Zholents (ANL)Major trends in the contemporary linac designs for x-ray free-electron lasers (XFELs) are outlined starting withidentification of the key performance parameters, continuing with considerations of the design options for theelectron gun and linac, and finishing with electron beam manipulation in the phase space.

TUPB009 C-Band Accelerating Structure Development and Tests for the SwissFEL – R. Zennaro (Paul Scherrer Institut),J. Alex, H. Blumer, M. Bopp, A. Citterio, T. Kleeb, L. Paly, J.-Y. Raguin (Paul Scherrer Institut)SwissFEL requires a 5.8 GeV beam provided by a C-band linac consisting of 104 two-meter accelerating struc-tures. Each structure is of the constant gradient type and is composed of 113 cups. The cup shape is double-rounded to increase the quality factor. No tuning feature is implemented. For this reason ultra-precise turningis exploited. A strong R&D program has been launched on structure fabrication, which will be followed by afuture technology transfer to a commercial company. The program includes the production and test of shortstructures that can be brazed in the existing PSI vacuum oven and will be completed with the production ofthe full two-meter prototype once the new full scale brazing oven, presently under construction, is operational.The status of the R&D program, including the production and power test results of the first two test structures,is reported here.

TUPB010 The Swiss FEL RF Gun: RF Design and Thermal Analysis – J.-Y. Raguin (Paul Scherrer Institut), M. Bopp,A. Citterio, A. Scherer (Paul Scherrer Institut)We report here on the design of a dual-feed S-band 2.5 cell RF gun, developed in the framework of SwissFEL,capable of operating at 100 Hz repetition rate. As in the LCLS RF gun, z-coupling, to reduce the pulsed surfaceheating, and a racetrack coupling cell shape, to minimize the quadrupolar component of the fields, have beenadopted. The cell lengths and the iris thicknesses are as in the PHIN gun operating at CERN. However theirises aperture has been enlarged to obtain a frequency separation between the operating π mode and the π/2mode higher than 15 MHz. An amplitude modulation scheme of the RF power, which allows one to obtain aflat plateau of 150 ns for multibunch operation and a reduced average power is presented as well. With an RFpulse duration of 1µs it is shown that operation at 100 MV/m and 100 Hz repetition rate is feasible with veryreasonable thermal stresses.

TUPB011 The Swiss FEL S-Band Accelerating Structure: RF Design – J.-Y. Raguin (Paul Scherrer Institut)The Swiss FEL accelerator concept consists of a 450 MeV S-band injector Linac at 2998.8 GHz followed by themain linac at the C-band frequency aiming at a final energy of 5.8 GeV. The injector has six four-meter longS-band accelerating structures that shall operate with gradients up to 20 MV/m and with a 100 Hz repetitionrate. Each structure has 122 cells, including the two coupler cells and operates with a 2π/3 phase advance.The design presented is such that the average dissipated RF power is constant over the whole length of thestructure. The cells consist of cups and the cell irises have an elliptical profile to minimize the peak surfaceelectric field. The coupler cells are of the double-feed type with a racetrack cross-section to cancel the dipolarcomponents of the fields and to minimize its quadrupolar components.

TUPB012 The Swiss FEL C-Band Accelerating Structure: RF Design and Thermal Analysis – J.-Y. Raguin (Paul ScherrerInstitut), M. Bopp (Paul Scherrer Institut)The Swiss FEL accelerator concept consists of a 450 MeV S-band injector linac followed by the main linac inC-band aiming at a final energy of 5.8 GeV. The two-meter long C-band accelerating structures have 113 cells,including the two coupler cells, and operate with a 2π/3 phase advance. The structure is of the constant-gradient type with rounded wall cells and has an average iris radius of 6.44 mm, a radius compatible with theimpact of the short-range wakefields on the whole linac beam dynamics. The cell irises have an elliptical profileto minimize the peak surface electric fields and the coupler cells are of the J-type. We report here on the RFdesign of the structure, as well as on its thermal analysis, to target operational conditions with an acceleratinggradient of about 28 MV/m and a repetition rate of 100 Hz.


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TUPB013 Update on the Commissioning Effort at the SwissFEL Injector Test Facility – T. Schietinger (Paul Scherrer In-stitut), M. Aiba, S. Bettoni, B. Beutner, E. Prat (Paul Scherrer Institut)The SwissFEL injector test facility at the Paul Scherrer Institute is the principal test bed and demonstrationplant for the SwissFEL project, which aims at realizing a hard-X-ray Free Electron Laser by 2017. Since thespring of 2012 the photoinjector facility is running with all RF cavities in full operation, allowing beam mea-surements at energies around 230 MeV with bunch charges between 10 and 200 pC. A magnetic bunch com-pression chicane in conjunction with a transverse deflecting cavity is used for bunch compression studies,including tests and evaluation of longitudinal diagnostics options. We give an overview of recent commission-ing efforts and a summary of results from longitudinal measurements as well as transverse measurements ofprojected and slice emittance obtained with different optics-based methods.

TUPB014 Comparative Design of Single Pass, Photo-cathode RF-LINAC FEL for the THz Frequency Range: Self Ampli-fication vs. Enhanced Super-radiance – Yu. Lurie (Ariel University Center of Samaria, Faculty of Engineering),Y. Pinhasi (Ariel University Center of Samaria, Faculty of Engineering)Self amplified spontaneous emission and enhanced super-radiance are discussed and compared as possibleconfigurations in the construction of a single-pass, photo-cathode RF-LINAC FEL source for THz radiation,being developed in Ariel University Center of Samaria. Numerical simulations carried out using 3D, space-frequency approach demonstrate the charge squared dependence of the radiation power in both cases, thecharacteristic typical to super-radiant emission. The comparison reveals a high efficiency of an enhancedsuper-radiance FEL, which however can only be achieved with ultra-short (the radiation wavelength long orshorter) drive electron beam bunches at a proper energy chirping.

TUPB015 Warm Beamlines and Infrastructure in the European XFEL – M. Hüning (DESY)The European XFEL is driven by a superconducting linear accelerator. In the main accelerator tunnel theaccelerator modules will be suspended from the tunnel ceiling. The warm sections like bunch compressorswill be installed on girders supported from the floor. The accelerator infrastructure like klystrons and electronicracks will be installed in the accelerator tunnel in close proximity to the electron beamline.

TUPB016 Performance Studies of Multi-beamline X-Ray FEL Facilities – J.S. Wurtele (LBNL), B. Austin, J.N. Corlett,L.R. Doolittle, P. Emma, G. Penn, D. Prosnitz, J. Qiang, M.W. Reinsch, A. Sessler, M. Venturini (LBNL)A state-of-the-art x-ray FEL facility must provide useful photon pulses to a variety of user experiments. Thefacility design requires balancing multiple science demands while constrained by FEL and linac physics andengineering limitations. We have developed the STAFF (System Trade Analysis for an FEL Facility) MATLABprogram enabling us to rapidly explore a large range of system parameters. The code uses analytical modelsand look-up tables as needed for speed and flexibility. The code includes numerous linac and FEL physicsmodules [3-D gain with emittance and energy spread, SASE and self-seeding, harmonics, dual-period wigglerdesigns, and a simplified model of the microbunching instability in the linac], a variety of wiggler technologies[Hybrid permanent magnet, Nb3Sn and NbTi] within a modular design that simplifies inclusion of new physicsmodels. Models to be included are wakefields, cavity higher-order modes and aspects of linac design, e.g., alaser heater, harmonic linearizer, and bunch compressors. STAFF-based explorations of the performance anderror tolerances for an FEL facility at LBNL are presented.

TUPB018 Beam-based Alignment for the SXFEL – D. Gu (SINAP), Q. Gu, D. Huang, M. Zhang, M.H. Zhao (SINAP)In linear accelerators, dispersion caused by quadrupole misalignment and transverse wake-field effect causedby alignment errors of accelerate structures will lead to a significant emittance growth. There are more strin-gent restrictions on SXFEL, the traditional optical alignment can no longer meet its requirements, but theBeam-Based Alignment(BBA) method allows more precise alignment, further reduce the Linac errors to meetSXFEL requirements .In undulator sections, orbit changes are not only caused by misalignments of quadru-pole magnet position ,but also the errors of undulator magnetic. In order to achieve alignment accuracy overlonger distance, we measuring BPM data under different conditions and using SVD algorithm for calculationand analysis, we can get the quadrupole magnet errors and BPM offset. With the method above, software basedon MATLAB has been designed and compared the results with other software.

TUPB019 Second CW and LP Operation Test of XFEL Prototype Cryomodule – J.K. Sekutowicz (DESY), V. Ayvazyan,J. Branlard, M. Ebert, J. Eschke, A. Gössel, D. Kostin, W. Merz, F. Mittag, R. Onken (DESY) W. Cichalewski, W. Jał-muzna, A. Piotrowski, K.P. Przygoda (TUL-DMCS) J. Szewinski (The Andrzej Soltan Institute for Nuclear Studies,Centre Swierk)In summer 2011, we have performed the first test of continuous wave (cw) and long pulse (lp) operation of theXFEL prototype cryomodule, which originally has been designed for short pulse operation. In April and June2012, the second test took place, with the next cryomodule prototype. For that test cooling in the cryomod-ule was improved and new LLRF system has been implemented. In this contribution we discuss results of thesecond RF test of these new types of operation, which can in the future extend flexibility in the time beamstructure of the European XFEL facility

TUPB020 Status of the European XFEL 3.9 GHz system – E. Vogel (DESY) A. Bosotti, P. Michelato, L. Monaco, R. Paparella,P. Pierini, D. Sertore (INFN/LASA) E.R. Harms (Fermilab) C. Pagani (UniversitÃ degli Studi di Milano & INFN)The third harmonic system at 3.9 GHz of the European XFEL injector section will linearize the bunch RF curva-ture, induced by first accelerating module, before the first compression stage. This paper presents qualificationtests on cavity prototypes and the on-going activities towards the realization of the third harmonic section ofthe European XFEL in view of its commissioning in 2014.


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TUPB021 Study of Plasma Effect in Longitudinal Space Charge (LSC) Induced Microbunching Instability – D. Huang(SINAP), Q. Gu (SINAP) K.Y. Ng (Fermilab)The longitudinal space charge (LSC) plays an important role in introducing the microbunching instability inthe LINAC of a free electron laser (FEL) facility. The current model of LSC impedance [1] derived from thefundamental electromagnetic theory [2] is widely used to explain the growth of the microbunching instability[3]. However, in the case of highly bright relativistic electron beams, the plasma effect starts to play a role. Inthis article, the basic model of LSC impedance including the plasma effect is built , and the modifications tothe microbunching instability based on the new model are discussed in various conditions.

TUPB022 A Passive Linearizer for Bunch Compression – Q. Gu (SINAP), M. Zhang, M.H. Zhao (SINAP)In high gain free electron laser (FEL) facility design and operation, a high bunch current is required to get lasingwith a reasonable gain length. Because of the current limitation of the electron source due to the space chargeeffect, a compression system is commonly used to compress the electron beam to the exact current needed.Before the bunch compression, the nonlinear energy spread due to the finite bunch length should be com-pensated; otherwise the longitudinal profile of bunch will be badly distorted. Usually an X band acceleratingstructure is used to compensate the nonlinear energy spread while decelerating the beam. For UV FEL facility,the X band system is too expensive comparing to the whole facility. In this paper, we present a corrugatedstructure as a passive linearizer, and the preliminary study of the beam dynamics is also shown.

TUPB023 The Optimization of RF Deflector Input Power Coupler – A.Yu. Smirnov (MEPhI), O.A. Adonev, P.V. Binyukov,N.P. Sobenin (MEPhI)This paper concerns the investigation of different types of input power cell for S-band RF electron deflector.This device serving for slice emittance diagnostics is a disc-loaded waveguide which operates with TE11-likewave in traveling wave regime with 120 deg phase shift per cell. Since this deflector meets the restriction on itslength and has to provide high enough deflecting potential to a particle during its flight time it is significant toincrease the transversal field strength in coupling cell or to shorten it so that the deflecting potential remainsconstant. The total structure consists of 14 regular cells and two couplers. As it is now all cells have the samelength equal to D=33.34 mm and the field in couplers is lower than that of regular cells. In this paper differentlength are considered and numerically simulated in order to choose the best one.

TUPB024 Compact High Peak Brightness PhotoInjectors – C. Limborg-Deprey (SLAC), X.H. Liu (SLAC)We explore the possibility of producing electron bunches having low transverse emittance, kA levels peak cur-rent and a few fs FWHM length, from RF photoinjectors. Results from numerical simulations performed withthe multiparticle tracking code ASTRA show that such performances can be achieved by using a dedicatedshort compressor section after the RF gun and before a capture accelerating section. A comparison of perfor-mances obtained by using either X-Band or C-Band technologies for this configuration is presented. Detailedsensitivity studies are run to determine the viability of such photoinjectors as drivers for Free-Electron-Lasersand for Ultra-Fast-Electron Diffraction experiments.

TUPB025 Ultra-cold and Ultra-bright Electron Sources: Future Prospects – S. Chattopadhyay (Cockcroft Institute)The quality of a scientific instrument, based on charged particle beams, such as a linear accelerator, free elec-tron laser or collider, can only be as good as the quality of the source of the desired particles at injection andno better; hence the importance of R&D on the facility front end to produce the coldest, brightest and mostcoherent sources of particles possible, eliminating the need for large expensive accelerator infrastructure tofollow. The ultimate quality of advanced x-ray free electron lasers and coherent electron diffraction facilities,depend on the phase-space brightness and coherence of the electrons. Today’s best electron sources, based onthermionic or semi-conductor surface emitters, are still very “hot” with an equivalent temperature of a 1000oK,with a rather dilute phase space. We will explore the fundamental limits of these conventional technologies aswell as advanced surface, plasma and atomic physics techniques to generate “ultra-cold” electron beams witha low temperature reach potentially down to 1oK and associated “ultra-bright” phase space densities suitablefor compact x-ray FELs and coherent electron diffraction facilities of the future.

TUPB026 Measurements of a Reduced Energy Spread of a Recirculating Linac by Non-isochronous Beam Dynamics –F. Hug (TU Darmstadt), C. Burandt, M. Konrad, N. Pietralla (TU Darmstadt) R. Eichhorn (Cornell University)The Superconducting Linear Accelerator S-DALINAC at the University of Darmstadt (Germany) is a recirculat-ing linac with two recirculations providing beams for measurements in nuclear physics at small momentumtransfers. For these experiments an energy spread of better than 10-4 (rms) is needed. Currently accelerationin the linac section is done on crest of the accelerating field. The recirculation path is operated achromaticand isochronous. In this recirculation scheme the energy spread of the resulting beam in the ideal case is de-termined by the electron bunch length. Taking into account the stability of the RF system the energy spreadincreases drastically to more than 10-3 (rms). We will present a new non-isochronous recirculation schemewhich helps cancelling out these errors from the rf-control. This scheme uses longitudinal dispersion in therecirculation paths and an acceleration off-crest with a certain phase with respect to the maximum. We willpresent results of the commissioning of the new system including measurements of the longitudinal dispersionin the recirculation arcs as well as measurements of the resulting energy spread using an electron spectrometer.


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02 Proton and Ion Accelerators and ApplicationsTUPB028 Status of the Rare Isotope Science Project in Korea – J.-W. Kim (NCC, Korea) Y. Chung, D. Jeon, S.K. Kim (IBS)

E.-S. Kim (KNU)A heavy-ion accelerator facility is being designed in Korea for the production of rare isotope beams under thename of rare isotope science project (RISP). The project is funded and officially started in Jan. 2012. The accel-erator complex is composed of three main accelerators: a superconducting linac to use in-flight fragmentation(IF) method in generating isotope beams, a 70 kW proton cyclotron for the ISOL method, and a superconduct-ing post accelerator for re-acceleration of rare isotope beams to the energy range of 18 MeV/u. The minimumenergy of a U beam required for the IF driver is 200 MeV/u at the beam power of 400 kW. The beam current of Uions in high charge states is limited by the performance of existing ECR ion sources. This facility will be uniquein the aspect that state-of-art accelerators are facilitated for both the IF and ISOL drivers and combined toproduce extreme exotic beams. Also, standalone operation of each accelerator will allow us to accommodatediverse users from beam application fields as well as nuclear physics. The current status of the design effortswill be presented.

TUPB029 Beam Intensity and Energy Control on the SPIRAL2 Facility – C. Jamet (GANIL), T. André, C. Doutresssoulles,B. Ducoudret, W. Le Coz, G. Ledu, F. Lepoittevin, S. Loret (GANIL)The first part of the SPIRAL2 facility, which entered last year in the construction phase at GANIL in France,consists of an ion source, a deuteron and a proton source, a RFQ and a superconducting linear acceleratordelivering high intensity, up to 5mA and 40 MeV for the deuteron beams. Diagnostic developments have beendone to control the intensity and the beam energy by non-interceptive methods at the linac exit. The beamcurrent is measured by using couples of ACCT-DCCT installed along the lines and the beam energy by using atime of flight device. This paper gives explanations about the technical solutions, the results and resolutionsfor measuring and controlling the beam.

TUPB030 Overview of the Superconducting Linacs of the Rare Isotope Science Project – D. Jeon (IBS), Y. Chung,H.J. Kim, S.K. Kim (IBS) E.-S. Kim (KNU) J.-W. Kim (NCC, Korea)The Rare Isotope Science Project is launched in Korea to build a IF and ISOL facilities. The IF driver supercon-ducting linac is to accelerate ion beams up to 200 MeV/u for U beam and 600 MeV for proton beam. The ISOLpost linac is a superconducting linac to accelerate up to 18 MeV/u for U beam. General layout of SC linac isdiscussed.

TUPB031 Beam Envelope Analysis and Simulation – V.S. Dyubkov (MEPhI), S.M. Polozov (MEPhI)Forming the charge particle beams with small cross-sections and low energies is an actual problem for a linacdesign. That beams are used actively for isotope therapy, ion implantation, etc. Beam emittance is its qualityfactor, and it should be matched with a facility channel acceptance. The method for beam dynamics analysisat linac is developed in terms of non-coherent particle oscillation study. Nonlinear beam dynamics is inves-tigated by using this method. It is shown that this technique allows one to realize effective beam emittancecontrol. Analytical results obtained are verified by means of numerical simulation.

TUPB032 Beam Dynamics of the Linac ALPI-PIAVE in View of Possible Upgrades Scenario for the SPES Project. –M. Comunian (INFN/LNL), C. Roncolato (INFN/LNL) B.B. Chalykh (ITEP)At the Legnaro National Laboratories it is operating a Super Conducting linac for nuclear studies named ALPI.The ALPI linac is injected either by a XTU tandem, up to 14 MV, or by the s-c PIAVE injector, made with 2 SC-RFQ. In this article will be report the beam dynamics simulations for some possible scenario upgrade of thelinac operate by a new injector, made with a new RFQ.

TUPB033 Implementation of Piezoelectric Actuator Based Phase Locking System for IUAC Linac – B.K. Sahu (IUAC),R. Ahuja, G.K. Chowdhury, R.N. Dutt, S. Ghosh, D. Kanjilal, J. Karmakar, M. Kumar, R. Kumar, D.S. Mathuria,A. Pandey, P. Patra, A. Rai, A. Roy, S.K. Suman (IUAC)The linac of IUAC consists of three main accelerating modules with each one housing eight superconductingquarter wave resonators. Currently, the phase locking of the resonator is performed by a combination of fastI-Q based electronic tuner and helium gas flow based mechanical tuner. Microphonics measurement on theresonators found the presence of lower frequency vibrations along with main mechanical mode (∼60 Hz) ofthe resonators. Although main mechanical mode of the resonator is damped by using SS balls, the presence oflower frequency vibrations demand more RF power from the amplifier, as the existing mechanical tuner worksin time scale of seconds. A combination of piezoelectric actuator based fast tuner along with stepper motorbased coarse tuner operating in the time scale of milliseconds is being developed. This scheme is implementedon a few resonators in last linac cryostat. Initial results show that this mechanism can arrest all low frequencyvibrations thereby reducing a substantial load from the electronic tuner and improve the dynamics of the phaselocking scheme. The implementation scheme along with test results will be presented in detail.

TUPB034 A Helium Injector for Coupled RFQ and SFRFQ Cavity Project at Peking University – S.X. Peng (PKU/IHIP),J. Chen, J.E. Chen, S.L. Gao, Z.Y. Guo, P.N. Lu, H.T. Ren, Y. Xu, J. Zhao (PKU/IHIP)A new acceleration structure named as coupled RFQ and SFRFQ cavity is under design at Peking University(PKU). A pulsed He+ beam injector will be needed to transport 30 keV 20 mA He+ beam with a factor of 1/6,pulse width of 1 ms and normalized rms emittance less than 0.15 π·mm·mrad for this composited type cavity.Based on the experimental results obtained on the PKU LEBT test bench, a 1.16 m long two-solenoid type lowenergy beam transport (LEBT) line was developed. In this paper we will address the 30 keV He+ ion beamtransportation experiment results on the test bench as well as the specific design on the helium injector.


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TUPB035 A New Design of the RFQ Channel for GSI HITRAP Facility – S.G. Yaramyshev (GSI), W.A. Barth, G. Cle-mente, L.A. Dahl, V. Gettmann, F. Herfurth, M. Kaiser, M.T. Maier, D. Neidherr, A. Orzhekhovskaya, H. Vormann,G. Vorobjev (GSI) R. Repnow (MPI-K)The HITRAP linac at GSI is designed to decelerate ions with mass to charge ratio of A/Z<3 from 4 MeV/u to6 keV/u for experiments with ion traps. The particles are decelerated to 500 keV/u with an IH-DTL stuctureand finally to 6 keV/u with a 4-rod RFQ. During commissioning stage the deceleration to approx. 500 keV/uwas successfully demonstrated, while no particles behind the RFQ with an energy of 6 keV/u were observed.Dedicated simulations with DYNAMION code, based on 3D-fotometrie of the fabricated RFQ electrodes weresuccessfully performed comprehending the commissioning results. In a second step the simulations havebeen experimentally confirmed at a test-stand (MPI, Heidelberg). An input energy, accepted by the RFQ chan-nel is significantly higher than design value. For this reason the longitudinal beam emittance after decelerationwith IH structure does not fit to the longitudinal RFQ acceptance. To solve this problem a new design of theRFQ channel with a correct input energy has been started. New RFQ parameters and the results of the beamdynamics simulations are presented in this paper.

TUPB036 Design of Re-buncher Cavity for Heavy-ion LINAC in IMP – L.P. Sun (IMP), Y. He, A. Shi, Z.L. Zhang (IMP)A re-buncher with spiral arms for a heavy ion linear accelerator named as SSC-LNAC at HIRFL (the heavyion research facility of Lanzhou) has been constructed. The re-buncher, which is used for beam longitudinalmodulation and match between the RFQ and DTL, is designed to be operated in continuous wave (CW) modeat the Medium-Energy Beam-Transport (MEBT) line to maintain the beam intensity and quality. Because ofthe longitudinal space limitation, the re-buncher has to be very compact and will be built with four gaps.We determined the key parameters of the re-buncher cavity from the simulations using Microwave Studiosoftware, such as the resonant frequency, the quality factor Q and the shunt impedance. The detailed designof a 53.667 MHz spiral cavity and measurement results of its prototype will be presented.

TUPB038 Progress of Heavy Ion Linear Injector for SSC at HIRFL – Y. He (IMP), H. Jia, C. Li, Z.J. Wang, Y.J. Yuan,H.W. Zhao (IMP)A heavy ion linear accelerator was proposed to be employed as the injector of cyclotron SSC at the Heavy IonResearch Facility in Lanzhou (HIRFL). It is an upgrade project to improve beam intensity and beam time ofHIRFL. The total energy of the linac is 7 MeV, including an 4-rod RFQ and four IH-DTLs. The RFQ and the firstIH-DTL tank have been fabricated and tested. These and other progress of the project will be introduced in thepaper.

TUPB039 Conceptual design of Superconducting Heavy Ion Linear Injector for HIAF – Z.J. Wang (IMP), Y. He, H. Jia,C. Li, S.H. Liu (IMP)A heavy ion accelerator facility, High Intensity Heavy Ion Accelerator Facility (HIAF), has been promoted byInstitute of Modern Physics (IMP) of Chinese Academy of Sciences (CAS). The injector of the accelerator facilityis a superconducting linac. It is a high intensity heavy ion linac and works on pulse mode. The final energyis 150 MeV/u. The accelerated species are from P to Uranium. The linac works with both laser and ECR ionsource. The designed current is 20 emA. The general concept of HIAF and the preliminary design of linearinjector are presented in the paper.

TUPB040 Progress Towards Final Engineering Design of the FRIB Linear Accelerator – M. Leitner (FRIB), E.C. Bernard,B. Bird, N.K. Bultman, F. Casagrande, C. Compton, K.D. Davidson, P.E. Gibson, I. Grender, L.L. Harle, K. Holland,M.J. Johnson, S. Jones, D. Leitner, G. Machicoane, F. Marti, D. Morris, J.P. Ozelis, S. Peng, J. Popielarski, L. Po-pielarski, E. Pozdeyev, T. Russo, K. Saito, R.C. Webber, J. Wei, J. Weisend, M. Williams, Y. Yamazaki, Y. Zhang,Q. Zhao (FRIB) A. Facco (INFN/LNL)The Facility for Rare Isotope Beams (FRIB) will utilize a high-intensity, superconducting heavy-ion driver linacto provide stable ion beams from protons to uranium up to energies of >200 MeV/u and at a beam power ofup to 400 kW. Two ECR ion sources installed above ground will be used to provide highly charged ions that willbe transported into the linac tunnel approximately 10 m below ground. Subsequently, the ions are acceleratedto about 0.5 MeV/u using a room-temperature 80.5 MHz RFQ and injected into the superconducting cw linacconsisting of 330 individual low-beta cavities in 49 cryomodules operating at 2 K. To reduce tunnel length thelinac is double-folded into three straight sections connected by two compact bend sectors. A single strippersection will be located at about 17 MeV/u (for uranium) before the first bend. The linac technical developmentstatus and engineering design details as well as acquisition strategies are discussed.

TUPB041 Scattering of H- Stripped Electrons from SEM Grids and Wire Scanners at the CERN LINAC4 – F. Roncarolo(CERN), E. Chevallay, B. Cheymol, M. Duraffourg, G.J. Focker, C. Heßler, U. Raich, VC. Vuitton, F. Zocca (CERN)At the CERN LINAC4, wire grids and scanners will be used to characterize the H- beam transverse profile atdifferent stages along the acceleration to 160 MeV. The wire signal will be determined by the balance betweensecondary emission and number of charges stopped in the wire, which will depend on the wire material and di-ameter, the possible choice of biasing (DC) the wires and the beam energy. The outermost electrons of H- ionsimpinging on a wire are stripped in the first nanometers of material. A portion of such electrons are scatteredaway from the wire and can reach the neighboring wires. In addition, scattered electrons hitting the surround-ing beam pipe generate secondary electrons that can also perturb the measurement. Monte Carlo simulations,analytical calculations and a laboratory experiment allowed quantifying the amount of scattering and the scat-tered particles distributions. The experiment was based on 70 keV electrons, well reproducing the case of 128MeV H- ions. For all the LINAC4 simulated cases the predicted effect on the beam size reconstruction resultsin a relative error of less than 5%.


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TUPB042 Progress on RFQIII Fabrication in J-PARC Linac – T. Morishita (JAEA/J-PARC)The J-PARC accelerator comprises an injector linac, a 3 GeV Rapid-Cycling Synchrotron and a 50 GeV MainRing. The J-PARC linac has been operating for users with the beam energy of 181 MeV. The energy (to 400 MeV)and current (to 50 mA) upgrade of the linac is scheduled for 1MW operation at RCS. For the current upgrade, thefabrication of a new RFQ, which is designed for 50 mA acceleration, has been started. The engineering designand the fabrication technologies were carefully chosen to reduce the discharge risk during the operation. Forgood vacuum pumping, vanes and ports are brazed for the direct pumping through slits at the tuners. Also,we tried a chemical polishing to improve the smoothness of the vane surface. In this paper, we present thefabrication progress of a new RFQ in J-PARC linac.

TUPB043 The Conceptal Design of Compact Linac Injector in Heavy Ion Therapy Facility – X.H. Zhang (IMP)The design of compact injection linac for therapy accelerator is discussed. The linac design is based on inter-digital H mode drift tube with Alternative phase focusing. A high acceleration rate and an absence of mag-netic lenses inside drift-tubes reduce the cost and the length of APF-IH linac in comparison with conventionallinac based on Alvarez structure with magnet quadrupoles inside drift tubes. To reduce the effect of emittancegrowth, the RFQ structure is used in front of the APF linac. In such linac, 12C5+ will be accelerated from 10keV/u to 4 MeV/u, and the current transmission of carbon beam can reach up to 90-100%. In this report, thebasic parameters of the whole linac are presented.

TUPB045 Beam Dynamics Studies for the ATLAS Upgrade – B. Mustapha (ANL), P.N. Ostroumov (ANL)The ATLAS Intensity & Efficiency Upgrade is well underway. The new RFQ is fully assembled and being readiedfor offline beam tests and the seven SC cavities already built and processed for the new cryomodule. The onlineinstallation of both components is scheduled for early to mid next year. As a preparation for first beams, wehave performed end-to-end beam dynamics simulations including realistic machine errors and corrections.After presenting the new ATLAS layout involving major arrangements of the existing beam line, the results ofthese simulations will be presented and discussed.

TUPB046 R&D Towards CW Ion Linacs at ANL – P.N. Ostroumov (ANL), A. Barcikowski, Z.A. Conway, S.M. Gerbick,M. Kedzie, M.P. Kelly, S.V. Kutsaev, J.W. Morgan, R.C. Murphy, B. Mustapha, D.R. Paskvan, T. Reid, D.L. Schrage,S.I. Sharamentov, K.W. Shepard, G.P. Zinkann (ANL)The accelerator development group in ANL’s Physics Division has engaged in substantial R&D related to CWproton and ion accelerators. Particularly, a 4 meter long 60.625 MHz CW RFQ has been developed, built andis being commissioned with beam. Development and fabrication of a cryomodule with seven 72.75 MHzquarter-wave cavities is complete and it is being assembled. Off-line testing of several QWRs has demon-strated outstanding performance in terms of both accelerating voltage and surface resistance. Both the RFQand cryomodule were developed and built to upgrade ATLAS to higher efficiency and beam intensities. An-other cryomodule with eight 162.5 MHz SC HWRs and eight SC solenoids is being developed and built forProject X at FNAL. We are also developing both an RFQ and cryomodules (housing 176 MHz HWRs) for pro-ton & deuteron acceleration at SNRC (Soreq, Israel). In this paper we discuss ANL-developed technologies fornormal-conducting and SC accelerating structures for medium- and high-power CW accelerators, includingthe projects mentioned above and other developments for applications such as transmutation of spent reactorfuel.

TUPB047 Status of the Superconducting RF Activities for the HIE ISOLDE Project – W. Venturini Delsolaro (CERN),L. Alberty Vieira, L. Arnaudon, S. Calatroni, O. Capatina, A. D’Elia, B. Delaup, M.A. Fraser, N.M. Jecklin, Y. Kadi,I. Mondino, E. Montesinos, K.M. Schirm, M. Therasse, D. Valuch, L.R. Williams (CERN)The planned upgrade of the REX ISOLDE facility at CERN consists in boosting the energy of the machine from3MeV/u up to 10 MeV/u with beams of mass-to-charge ratio 2.5<A/q<4. A new Superconducting post accel-erator based on independently phased 101.28 MHz Quarter Wave Resonators (QWRs) will replace part of thenormal conducting LINAC. The QWR will be based on the Niobium sputtering on Copper technology whichwas successfully applied to the energy upgrade of the ALPI LINAC at INFN-LNL. The status of advancement ofthe project will be detailed, with particular consideration to the SRF activities.

TUPB048 Theoretical Discussion of the Optimisation of a Linac Lattice to Minimise Disruption by a Class of ParasiticModes – S. Molloy (ESS) R. Ainsworth (Royal Holloway, University of London)It is well known that each resonant mode in the RF spectrum of multi-cell accelerating cavities will split intoa passband containing a number of modes, and that the coupling of these modes to the beam is dependenton the velocity of the accelerated particles. If these modes are found to degrade the quality of the beam, itis possible to take various measures to damp them, and thus keep their effect below some critical threshold.In the case of the parasitic modes within the same passband as the fundamental accelerating mode, their fre-quency is typically too close to that of the fundamental to allow their power to be safely extracted, and so cavitydesigners must rely on the natural damping of the cavity itself. This note contains a theoretical discussion ofthe coupling of the beam to these passband modes for a large class of accelerating cavities, and provides amathematical model for use during the design and optimisation of linacs.


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TUPB049 Superconducting Low Beta Niobium Resonator for Heavy Ions – P.N. Prakash (IUAC), K.K. Mistri, A. Roy,J. Sacharias, S.S. Sonti (IUAC)For the high current injector at Inter-University Accelerator Centre, a new superconducting niobium resonatoroptimized for β = 0.05 operating at 97 MHz, has been designed and fabricated. This resonator has the highestfrequency in its class among the superconducting structures designed for such low velocity particles. The res-onator has been carefully modeled using Microwave Studio code to minimize the peak magnetic field in orderto achieve high accelerating gradients in it. Even though the resonance frequency is high, the physical di-mensions of the resonator are large enough to allow processing of its superconducting surface effectively. Themechanical design of the resonator has been modeled using ANSYS multiphysics to increase the frequency ofthe lowest mechanical eigenmode of the central co-axial line, and also reduce liquid helium induced pressurefluctuations in the resonator. Bead pull measurements have been performed on the niobium resonator andthey match with the design values very well. Cold tests at 4.2 K will be performed in the next few weeks. Thispaper will briefly present the design of the low beta resonator and details of the results from the cold tests.

TUPB050 Status of the SNS Superconducting Linac and SRF Activities – S.-H. Kim (ORNL), M. Broyles, A. Coleman,M.T. Crofford, M. Doleans, D.L. Douglas, M.P. Howell, Y.W. Kang, S.W. Lee, S.E. Stewart, W.H. Strong (ORNL)R. Afanador, J.A. Demko, B.S. Hannah, C.J. McMahan, T.S. Neustadt, S.W. Ottaway, J. Saunders, D.M. Vandygriff,T. Xu (ORNL RAD)The SNS Superconducting linac (SCL) is the first accelerator that uses superconducting radio-frequency (SRF)technology for a pulsed operational proton machine. The SNS has lots of efforts for accelerator commissioning,understanding machine operation during the power ramp up and most recently sustained improvements tobeam reliability. There have been substantial gains in the last 6 years in understanding SCL operation includingsystem and equipment limiting factors and resolution of system and equipment issues. Significant effort andfocus is required to assure ongoing success in the operation, maintenance and improvement of the SCL andto address the requirements of the upgrade project in the future. The SNS is developing activities (1) to ensurelong term sustainability of SNS operation, (2) to improve machine performances, and (3) to prepare futureupgrade projects. The activities include development of ASME code-stamped spare cryomodules, SRF facilitydevelopment for both processing and testing, R&D activities for SRF cavity performance improvements suchas in-situ plasma processing and, SRF cavity development for power upgrade project.

TUPB051 SPIRAL2 Cryomodule Qualification Progress – R. Ferdinand (GANIL), P.-E. Bernaudin (GANIL) P. Bosland(CEA/DSM/IRFU) Y. Gomez-Martinez (LPSC) G. Olry (IPN)The future superconducting Linear accelerator of the SPIRAL2 project at GANIL (France) assembly and condi-tioning processes are going on. Despite the good results of qualification cryomodules, the series integrationsshowed various difficulties from pollution to conditioning difficulties. Today’s situation and progresses aredescribed.

TUPB052 Studies of Parasitic Cavity Modes for Proposed ESS Linac Lattices – R. Ainsworth (Royal Holloway, Universityof London) S. Molloy (ESS)The European Spallation Source (ESS) planned for construction in Lund, Sweden, will be the worlds mostintense source of pulsed neutrons. The neutrons will be generated by the collision of a 2.5 GeV proton beamwith a heavy-metal target. The superconducting section of the proton linac is split into three different types ofcavities, and a question for the lattice designers is at which points in the beamline these splits should occur.This note studies various proposed designs for the ESS lattice from the point of view of the effect on the beamdynamics of the parasitic cavity modes lying close in frequency to the fundamental accelerating mode. Eachlinac design is characterised by the initial kinetic energy of the beam, as well as by the velocity of the beamat each of the points at which the cavity style changes. The scale of the phase-space disruption of the protonpulse is discussed, and some general conclusions for lattice designers are stated.

TUPB053 Main Coupler Design for Project X – S. Kazakov (Fermilab), S. Cheban, T.N. Khabiboulline, M. Kramp, Y. Orlov,V. Poloubotko, O. Pronitchev, V.P. Yakovlev (Fermilab) M.S. Champion (ORNL)A multi-megawatt proton/H- source, Project X, is under development at Fermi National Accelerator Labora-tory. Main element of it is a 3 GeV superconducting proton linac which includes 5 families of superconductingcavities of three frequencies: 162.5, 325 and 650 MHz. Scope of this paper is the development of power cou-plers for 325 and 650 MHz at FNAL. Upgraded version of the accelerator will require two types of couplers,which reliably can operate at CW power level ∼25 kW at 325 MHz and ∼100 kW at 650 MHz respectively. In thispaper we are describing the current design of these devices.

TUPB054 Coherent Effects of High Current Beam in Project X Linac – A.I. Sukhanov (Fermilab), A. Lunin, V.P. Yakovlev(Fermilab)Resonance excitation of longitudinal high order modes in superconducting RF structures of Project X CW linacis studied. We analyze regimes of operation of the linac with high beam current, which can be used to pro-vide an intense muon source for the future Neutrino Factory or Muon Collider, and also important for theAccelerator-Driven Subcritical (ADS) systems. We calculate power loss and associated heat load to the cryo-genic system. Longitudinal emittance growth is estimated. We consider an alternative design of the ellipticalcavity for the high energy part of linac, which is more suitable for high current operation.


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TUPB055 R&D of IMP Superconducting HWR – W.M. Yue (IMP), W. Chang, S. He, Y. He, M.X. Xu, B. Zhang, C. Zhang,S.H. Zhang, H.W. Zhao (IMP)The R&D program of IMP superconducting HWR is based on the China ADS, The aim is to build and test aHWR prototype before autumn 2012. We have designed a 162.5 MHz β=0.09 half-wave resonator (HWR), and acopper HWR has been fabricated in January 2012. The fabrication of a Nb HWR will be completed by July 2012,the fabrication of a slow tuner and a high power coupler for the HWR will be completed then. In this poster,we present the HWR electromagnetic design, mechanical design, fabrication arts, copper HWR RF test result,the mechanical design of the slow tuner, The RF design of the power coupler.

TUPB056 The Multipacting Simulation for the New-shaped QWR using TRACK3P – C. Zhang (IMP)In order to improve the electro-magnetic performance of the quarter wave resonator, a new-shaped cavitywith an elliptical cylinder outer conductor has been proposed. This novel cavity design can provide muchlower peak surface magnetic field and much higher Ra/Q0 and G. The Multipacting simulation has been donefor this new QWR cavity using ACE3P/TRACK3P code, in this paper the simulation results will be presentedand analyzed.

TUPB057 Structural Analysis of the New-shaped QWR for HIAF in IMP – C. Zhang (IMP)Since the QWR cavity is very successful for the operation with frequency of 48 to 160 MHz and β value of0.001 to 0.2, a new-shaped QWR is being designed for the low energy superconducting section of HIAF in theInstitute of Modern Physics. The cavity will work at 81.25 MHz and β of 0.085, with a elliptical cylinder outerconductor to better its electro-magnetic performance and keep limited accelerating space. Structural design isan important aspect of the overall cavity implementation, and in order to minimize the frequency shift of thecavity due to the helium bath pressure fluctuations, the Lorentz force and microphonic excitation, stiffeningelements have to be applied. In this paper, structural analyses of the new-shaped QWR are presented andstiffening methods are explored.

TUPB058 An Analytical Cavity Model for Fast Linac-beam Tuning – Z.Q. He (TUB), Z. Zheng (TUB) Z. Liu, J. Wei,Y. Zhang (FRIB)Quarter-wave resonators (QWR) and half-wave resonators (HWR), used for beam acceleration in the Facility ofRare Isotope Beams (FRIB) Project, produce axially asymmetric acceleration fields. Conventional method us-ing numerical 3-D field tracking to address this feature is time-consuming and thus not appropriate for on-linebeam tuning applications. In this paper, we develop analytical treatment of FRIB superconducting RF cavitiesfor on-line beam tuning. Models of cavities are derived using realistic 3-D field from CST simulation in bothlongitudinal and transverse dimensions. Then, beam parameters are calculated and benchmarked with a well-established 3-D field tracking program, IMPACT, to ensure the precision of the model. Finally, a comparison ismade between our model and the 3-D field tracking method in computational efficiency.

TUPB060 Multipacting Suppression Modeling for FRIB SRF Cavities and Couplers – Z. Zheng (FRIB), A. Facco, J. Popie-larski, K. Saito, J. Wei, Y. Xu, Y. Zhang (FRIB) Z. ZhengDuring the prototype cryomodule test of FRIB β=0.53 cavities, multipacting effects were found to limit theperformance of the cavities and couplers. We simulate these phenomena using the CST approach. Bench-markings are performed to validate the multipacting model. Furthermore, we optimize the design geometryfor both β=0.29 and β=0.53 cavities suppressing multipacting in the operating field range. Multipacting sup-pression is also performed for the fundamental power coupler with external magnetic fields.

TUPB061 Microphonics Simulation and Experimental Comparison – Z. Zheng (FRIB), J. Wei, Y. Zhang (FRIB) Z. ZhengMicrophonics was observed in the vertical test of FRIB β=0.085 quarter-wave resonator cavities causing fieldinstability and demanding high input RF power. We establish a microphonics model incorporating beam load-ing and their impacts on the cavity low-level RF system. A microphonics simulation was performed to evaluatethe effects on the amplitude and phase of the cavity’s voltage and the effectiveness of compensation using afast piezo tuner. Agreements were obtained between the simulation and experimental observation in both theSNS and FRIB cases.

TUPB062 A Conceptual Design of the Low Level RF Control System for Fermilab’s Project X 3 to 8 GeV Pulsed Linac –G.I. Cancelo (Fermilab), B. Chase, S. Nagaitsev, Y.M. Pischalnikov, W. Schappert, N. Solyak (Fermilab)The Pulsed Linac is a will require over 200 9-cell, 1300 MHz cavities packed in 26 ILC type cryomodules toaccelerate 1 mA average beam current from 3GeV to 8 GeV. The architecture of the RF must optimize RF power,beam emittance, and energy gain amid a large number of requirement and constraints. The pulse length is acritical issue. Ideally, a 26 ms pulse would allow direct injection into the Fermilab’s Main Injector, bypassingthe need of the Fermilab’s Recicler. High loaded quality factors (QL) are also desirable to minimize RF power.These requirements demand an accurate control of the cavity resonant frequency disturbed by Lorentz ForceDetuning and microphonics. Also the LLRF control system must regulate the RF amplitude and phase withintight bounds amid a long list of dynamic disturbances. The present work describes the simulation efforts andmeasurements at Fermilab facilities.

TUPB063 Design of the Elliptical Medium-beta Cavity for the ESS – G. Costanza (Lund University)The design of a five cell, medium-beta elliptical cavity for the ESS is presented. The ESS is the European Spal-lation Source, a neutron source that will allow the investigation of matter with a wide range of lengths andtime scales. The optimization process aimed at maximizing the R/Q, the geometrical factor G and the productR/Q*G of the fundamental mode, taking into account that the normalized peak surface fields, Bpk/Eacc and


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Epk/Eacc must be kept at an acceptable level. The design takes into consideration the Higher Order Modes(HOMs), thus an analysis of the HOMs is performed in order to determine the characteristics of the beamtubes, end cells, HOM couplers and the power delivered by the beam to the HOMs.

TUPB064 Spoke Cavity Design for the ESS Linac – S. Bousson (IPN), S. Brault, P. Duchesne, P. Duthil, N. Gandolfo, G. Olry,E. Rampnoux, D. Reynet (IPN)At the present time, the European Spallation Source (ESS) is the only approved project to use spoke resonatorsin the baseline of its superconducting accelerator. The spoke cavities will fill the intermediate section of theESS Linac to accelerate the proton beam from ∼70 MeV to 180 MeV. The spoke linac is composed of 352 MHzdouble spoke resonators, grouped by two in short cryomodules and will be operated at 2K. An intensive designstudy of the spoke cavities is undergoing in the IPN Orsay laboratory to optimize the cavity design to meetthe ESS performance objective. In this paper, we present the status of the spoke cavity design (geometry, RFand mechanical design) together with the conceptual design of its associated power coupler and cold tuningsystem.

TUPB066 Reduced-beta Cavities for High-intensity Compact Accelerators – Z.A. Conway (ANL), S.M. Gerbick,M. Kedzie, M.P. Kelly, J.W. Morgan, R.C. Murphy, P.N. Ostroumov, T. Reid (ANL)This paper reports on the development and testing of a superconducting quarter-wave and a superconductinghalf-wave resonator. The quarter-wave resonator is designed for β = 0.077 ions, operates at 72 MHz and canprovide more than 7.4 MV of accelerating voltage at the design beta, with peak surface fields of 164 mT and117 MV/m. Operation was limited to this level not by RF surface defects but by our available RF power andadministrative limits on x-ray production. A similar goal is being pursued in the development of a half-waveresonator designed for β = 0.29 ions and operated at 325 MHz.

TUPB067 Development of a Superconducting Half-Wave Resonator for PXIE – Z.A. Conway (ANL), R.L. Fischer,S.M. Gerbick, M. Kedzie, M.P. Kelly, S.V. Kutsaev, B. Mustapha, P.N. Ostroumov (ANL) I.V. Gonin, A. Lunin, V.P. Ya-kovlev (Fermilab) K.W. Shepard (TechSource)An ambitious upgrade to the FNAL accelerator complex is progressing in the Project-X Injector Experiment(PXIE). The PXIE accelerator requires 8 superconducting half-wave resonators optimized for the accelerationof 1 mA β = 0.11 H- ion beams. Here we present the status of the half-wave resonator development, focusingparticularly on cavity design, with a brief update on prototype fabrication.

TUPB068 Cryomodule Designs for Superconducting Half-wave Resonators – Z.A. Conway (ANL), G.L. Cherry, R.L. Fis-cher, S.M. Gerbick, M. Kedzie, M.P. Kelly, J.W. Morgan, P.N. Ostroumov (ANL) K.W. Shepard (TechSource)In this paper we present advanced techniques for the construction of half-wave resonator cryomodules. Re-cent advances in superconducting low-beta cavity design and processing have yielded dramatically improvedcavity performance which reduce accelerator cost and improve operational reliability. This improvement hasled to the proposal and construction of half-wave resonators by ANL for the acceleration of 0.1 < β < 0.5 ions,e.g., the SARAF Phase-II project at SNRC (SOREQ, Israel) and Project-X at Fermilab. These cryomodules buildand improve upon designs and techniques recently implemented in upgrades to ATLAS at ANL. Design issuesinclude the ease of assembly/maintenance, resonator cleanliness, operating at 2 or 4 Kelvin, and ancillary sys-tem interfacing.

TUPB069 BEAMDULAC-SCL Code for Complex Approach of Beam Dynamic Investigation in SC LINAC – A.V. Samoshin(MEPhI)Periodic sequences of independently phased accelerating cavities and focusing solenoids are used in MeV andGeV energy range linacs. The beam dynamic investigation is difficult for such superconducting linear accel-erator. The matrix calculation was preferably used for primary choused of accelerating structure parameters.This method does not allows properly investigate the longitudinal motion. The smooth approximation can beused to investigate the nonlinear ion beam dynamics in such accelerating structure and to calculate longitu-dinal and transverse acceptances. The potential function and the equation of motion in the Hamilton formare devised by the smooth approximation. The advantages and disadvantages of each method will describe,the results of investigation will compare. The user friendly software BEAMDULAC-SCL for ion beam dynamicanalysis was created. A numerical simulation of beam dynamics in the real field are carried out for the differentvariants of the accelerator structure based on previously analytically obtained results.

TUPB070 Development of Proton Therapy at the SC Linac with BEAMDULAC-SCL Code – A.V. Samoshin (MEPhI),S.M. Polozov (MEPhI)Proton cancer therapy complexes are conventionally developing based on synchrotrons and cyclotrons. Highelectrical power consumption and especial devices necessary to energy variation (as slow extraction systemsand degraders) are the main problems of such complexes. At once SC linacs based on short independentlyphased quarter and half wave cavities have a serious progress at present. Linear accelerator consumes lesspower comparably with cyclic and the energy variation can be easily realized by means of RF field amplitudeand phase variation in a number of cavities. The accelerator’s modular configuration which is now widely usedin FRIBs * or SNSs can be applied for therapy linac also (see for example **). It is possible to choose the SC linacparameters and proton and ion beams stability study with help of the BEAMDULAC-SCL code. This softwarealso allows providing of the structure optimization and the beam dynamics control.


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TUPB071 First Measurements on the 325 MHz Superconducting CH Cavity – M. Busch (IAP), M. Amberg, F.D. Dziuba,H. Podlech, U. Ratzinger (IAP)At the Institute for Applied Physics (IAP), Frankfurt University, a superconducting 325 MHz CH-Cavity hasbeen designed and built. This 7-cell cavity has a geometrical β of 0.16 corresponding to a beam energy of 11.4AMeV. The design gradient is 5 MV/m. Novel features of this resonator are a compact design, low peak fields,easy surface processing and power coupling. Furthermore a new tuning system based on bellow tuners insidethe resonator will control the frequency during operation. After successful rf tests in Frankfurt the cavity willbe tested with a 10 mA, 11.4 AMeV beam delivered by the GSI UNILAC. In this paper first measurements andcorresponding simulations will be presented.

TUPB072 Status of the Superconducting CW Demonstrator for GSI – F.D. Dziuba (IAP), M. Amberg, M. Busch,H. Podlech, U. Ratzinger, R. Tiede (IAP) K. Aulenbacher (IKP) W.A. Barth, S. Mickat (GSI)Since the existing UNILAC at GSI will be used as an injector for the FAIR facility a new, superconducting (sc)continous wave (cw) LINAC is highly requested by a broad community of future users to fulfil the requirementsof nuclear chemistry, especially in the research field of Super Heavy Elements (SHE). This LINAC is under de-sign in cooperation with the Institute for Applied Physics (IAP) of Frankfurt University, GSI, and the HelmholtzInstitut Mainz (HIM). It will consist of nine sc Crossbar-H-mode (CH) cavities operated at 217 MHz whichprovide an energy of up to 7.3 AMeV. Currently, a prototype of the cw LINAC is under development. This de-monstrator comprises the first sc CH cavity of the LINAC embedded between two sc solenoids mounted in ahorizontal cryomodule. One important milestone of the project will be a full performance test of the demon-strator by injecting and accelerating a beam from the GSI High Charge State Injector (HLI) in 2013/14. Thestatus of the demonstrator is presented.

TUPB073 The Designs and Simulations of a Test Model for a Tri-Spoke Cavity in RIKEN – L. Lu (RIKEN) O. Kamigaito,N. Sakamoto, K. Suda, K. Yamada (RIKEN Nishina Center)A tri-spoke type superconducting cavity, which is designed for uranium beams with β = 0.303 and 219 MHzoperational frequency, had finished the designs. And a fabrication model designed and assembled by two end-wall flanges and one triparted part of the designed tri-spoke cavity, was expected to be built using the samefabrication technology that is supposed for Nb cavity manufacture. Both the designs of the tri-spoke cavityand the test cavity will be reported in this paper.

TUPB074 Superconducting CW Heavy Ion Linac at GSI – W.A. Barth (GSI), P. Gerhard, V. Gettmann, S. Mickat (GSI)An upgrade program has to be realized in the next years, such that enhanced primary beam intensities at theexperiment target are available. For this a new sc 28 GHz full performance ECR ion source is under develop-ment. Via a new low energy beam line an already installed new RFQ and an IH-DTL will provide for cw-heavyion beams with high average beam intensity. It is planned to build a new cw-heavy ion-linac behind this highcharge state injector. In preparation an R&D program is still ongoing: The first linac section comprising a scCH-cavity embedded by two sc solenoids (financed by HIM) as a demonstrator will be tested with beam at theGSI High Charge Injector (HLI).The new linac should feed the GSI flagship experiments SHIP and TASCA, aswell as material research, biophysics and plasma physics experiments in the MeV/u-area. The linac will be in-tegrated in the GSI-UNILAC-environment; it is housed by the existing constructions. Different layout scenariosof a multipurpose high intensity heavy ion facility will be presented as well as the schedule for preparation andintegration of the new cw-linac.

TUPB075 Beam Dynamics Design of China ADS Proton Linac – Z. Li (Private Address) P. Cheng, H. Geng, Z. Guo, C. Meng,B. Sun, J.Y. Tang, F. Yan (IHEP)It is widely accepted that the Accelerator Driven System (ADS) is one of the most promising technical approachto solve the problem of the nuclear wastes, a potential threaten to the sustainable development of the nuclearfission energy. An ADS study program is approved by Chinese Academy of Sciences at 2011, which aims todesign and built an ADS demonstration facility with the capability of more than 1000 MW thermal power withinthe following 25 years. The 15 MW driver accelerator will be designed and constructed by the Institute ofHigh Energy Physics(IHEP) and Institute of Modern Physics(IMP) of China Academy of Sciences. This linac ischaracterized by the 1.5 GeV energy, 10mA current and CW operation. It is composed by two parallel 10 MeVinjectors and a main linac integrated with fault tolerance design. The superconducting acceleration structuresare employed except the RFQ. In this paper the general considerations and the beam dynamics design of thedriver accelerator will be presented.

TUPB076 Are the Focus Elements Needed Between the Spoke Cavity in a Linac? – J.H. Li (CIAE), Ma. Ma, G.B. Wang(CIAE) A. Facco (FRIB) X.L. Guan (Tsinghua University)A superconductor Linac composed of Spoke cavity has been simulated. The single quadruple is used betweeneach Spoke cavity. Five kinds of Spoke cavity are used in the Linac simulation. When the energy is higher than500 MeV, the field of single quadruple decreases to zero, and at the same time, the envelope does not enlarge.The reason maybe comes from the field shape of the spoke cavity.

TUPB077 Thorium Energy – S. Peggs (BNL) R. Cywinski (University of Huddersfield) R. Seviour (ESS)The potential for using thorium as an alternative or supplement for uranium in fission power generation haslong been recognised, with growing concerns over nuclear waste, safety and proliferation. Thorium may beused in solid fuel form, or in molten salt systems. In some approaches the fuel can incorporate componentsfrom spent nuclear fuel (minor actinides, plutonium) to also serve a transmutation function. We considerthe benefits and drawbacks of using an accelerator driven subcritical system, for both solid fuel and molten


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salt cases, in particular addressing the power and reliability requirements of the accelerator. We outline theresearch that will be necessary to lead to an informed choice.

03 TechnologyTUPB079 Design and Beam Test of Six-electrode BPMs for Second-order Moment Measurement – K. Yanagida (JASRI/

SPring-8), H. Hanaki, S. Suzuki (JASRI/SPring-8)In the SPring-8 linac, four-electrode beam position monitors (BPMs) have been utilized for the measurementof the transverse first-order moments, which correspond to the centroids of beam charge distributions. Wehave planed to measure the transverse second-order moments of beams to obtain information of beam opticsand its energy deviations during the top-up beam injection without destruction of beams. Therefore, six-electrode BPMs with circular and quasi-ellipse cross-sections have been developed on the basis of a newlyintroduced theory. A low-noise signal processor for the six-electrode BPM has also been developed to performfine measurement. We expected the following resolutions determined by the S/N ratio of the circuit; the firstorder moments (beam positions) >1 µm, and the second order moments with a size >110 µm. The first beamtest was carried out using the six-electrode BPM with circular cross-section and the old signal processor. Themeasured sensitivities and resolutions of the second-order moments showed good agreement with the theory.

TUPB080 Non-destructive, Shot-by-shot Real-time Monitor to Measure 3D Bunch Charge Distribution with a Fem-tosecond Resolution – H. Tomizawa (RIKEN SPring-8 Center), K. Ogawa, T. Sato (RIKEN SPring-8 Center)M. Aoyama (JAEA/Kansai) A. Iwasaki, S. Owada (The University of Tokyo) S. Matsubara, Y. Okayasu, T. Togashi(JASRI/SPring-8) T. Matsukawa, H. Minamide (RIKEN ASI) E. Takahashi (RIKEN)Non-destructive, shot-by-shot real-time monitors have been developed to measure 3D bunch charge distri-bution (BCD). This 3D monitor has been developed to monitor 3D overlapping electron bunches and higherharmonic generation (HHG) pulses in a seeded VUV-FEL. This ambitious monitor is based on an Electro-Optic(EO) multiple sampling technique in a manner of spectral decoding that is non-destructive and enables real-time measurements of the longitudinal and transverse BCD. This monitor was materialized in simultaneouslyprobing eight EO crystals that surround the electron beam axis with a radial polarized and hollow EO-probelaser pulse. In 2009, the concept of 3D-BCD monitor was verified through electron bunch measurements atSPring-8. The further target of the temporal resolution is∼30 fs (FWHM), utilizing an organic EO crystal (DAST)instead of conventional inorganic EO crystals (ZnTe, GaP, etc.) The EO-sampling with DAST crystal is expectedto measure a bunch length less than 30 fs (FWHM). In 2011, the first bunch measurement with an organic EOcrystal (DAST) was successfully demonstrated in the VUV-FEL accelerator at SPring-8.

TUPB081 Beam Diagnostics Development for Triumf E-linac – V.A. Verzilov (TRIUMF, Canada’s National Laboratoryfor Particle and Nuclear Physics), P.S. Birney, D.P. Cameron, J.V. Holek, S.Y. Kajioka, S. Kellogg, M. Lenckowski,M. Minato, W.R. Rawnsley (TRIUMF, Canada’s National Laboratory for Particle and Nuclear Physics) J.M. Aber-nathy, D. Karlen, D.W. Storey (Victoria University)TRIUMF laboratory is currently in a phase of the construction of a new superconducting 50 MeV 10 mA cw elec-tron linac (e-linac) to drive photo-fission based rare radioactive isotope beam (RIB) production. The projectimposes certain technical challenges on various accelerator systems including beam diagnostics. In the firstplace these are a high beam power and strongly varying operating modes ranging from very short beam pulsesto the cw regime. A number of development projects have been started to construct the diagnostics instru-mentation required for commissioning and operation of the facility. The paper reports the present status ofthe projects along with measurement results obtained at the test facility which produced the first beam in Fallof 2011.

TUPB082 Beam Loss Track Measurements by a Fast Trigger Scheme in J-PARC Linac – H. Sako (JAEA/J-PARC),T. Maruta, A. Miura (JAEA/J-PARC)In J-PARC Linac, highest beam loss has been observed at the ACS (Annular-Coupled Structure linac) section.The primary source of the beam loss is considered to be H0 produced by an interaction of H- beams with rem-nant gas. The H0 hits the beam duct, converted to H+, and escapes from the beam duct. To detect the H+’sand estimate the absolute magnitude of the beam loss, we constructed a detector system, which consists of 6planes of hodoscopes made of 16 scintillation fibers with 64 x 64 mm2 area. The scintillation light is measuredby multi-anode photomultipliers. In the ACS section, two planes to measure horizontal positions are installed,and at about 1 m downstream positions, two planes for horizontal measurements and two for vertical mea-surements are placed. We will reconstruct charged particles passing through all the 6 planes, and measure thevelocity by time-of-flight and energy loss to identify particle species. We present new measurements since therecovery of the J-PARC after the earthquake started in April 2012 by a new fast trigger scheme using dynodesignals of photomultipliers in order to improve signal-to-noise ratios.

TUPB084 High Dynamic Range High Speed Linac Current Measurements – C. Deibele (ORNL) D. Curry, R. Dickson(ORNL RAD)It is desired to measure the linac current of a charged particle beam with a consistent accuracy over a dynamicrange of over 120 dB. Conventional current transformers suffer from droop, can be susceptible to electromag-netic interference (EMI), and can be bandwidth limited. A novel detector and electronics were designed tomaximize dynamic range of about 120 dB and measure risetimes on the order of 10 nanoseconds.


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TUPB085 System Design for the FAIR Proton LINAC BPMs – P. Forck (GSI), M.H. Al-Malki, G. Clemente, L. Groening,W. Kaufmann, P. Kowina (GSI) W. Ackermann (TEMF, TU Darmstadt) B.B. Baricevic, M. Znidarcic (I-Tech)C.S. Simon (CEA/DSM/IRFU)The planned Proton LINAC for the FAIR facility will provide a beam of 70 mA current accelerated to 70 MeVby novel CH-type DTLs. Beam Position Monitor (BPM) will be installed at 14 locations along the LINAC. Thespecification for position measurement is 0.1 mm spatial resolution and for beam velocity determination us-ing time-of-flight the specification is about 10 ps corresponding to 1 degree phase resolution with respect tothe acceleration frequency of 325 MHz. Finite element and finite integration technique calculations were per-formed by CST Particle Studio for non-relativistic velocities to determine the signal characteristic in time- andfrequency domain. Within the beam pipe of 30 or 50 mm diameter, four-fold buttons BPMs are foreseen. Mostof these BPMs are mounted only about 40 mm upstream of the CH cavities and the BPM signal strength causedby the cavity residual rf-power was estimated. In the present design, position and phase information will beextracted from a digital I/Q demodulation. A first test with a commercial device was performed at the GSIUNILAC. The layout of the BPM system will be discussed.

TUPB086 Development of an Inexpensive Bunch Length and Structure Diagnostic Based on Smith-Purcell Radiationfor 15-500 Micron Electron Bunches – V. Bharadwaj (SLAC), C.I. Clarke (SLAC) H.L. Andrews (LANL) R. Bar-tolini, I.V. Konoplev, A. Reichold (JAI) N. Delerue (LAL) G. Doucas (Oxford University, Physics Department)E-203* is an approved experiment at the FACET User Facility at the SLAC National Accelerator Laboratory doingR&D on Smith-Purcell radiation emitted when a short electron bunch passes over gratings of various pitches.We intend to use the results of this R&D to design and build an inexpensive bunch length and structure diag-nostic that will work in the range of 15-500 microns. This diagnostic will be nondestructive and designed togive comparable information as transverse cavity deflector systems but at less than ten percent of the cost. Thiswill allow for installation of many such diagnostics in an electron accelerator and thereby improve beam tun-ing and operations. This paper describes the status of the development of the Smith-Purcell Bunch Structurediagnostic.

TUPB087 Design of a Cleanable Compact Beam Postion Monitor for Low-beta Beams – S.V. Kutsaev (ANL), Z.A. Con-way, P.N. Ostroumov (ANL) A. Perry (IIT)Currently, several high-intensity proton/ion CW accelerators are being developed worldwide based on super-conducting (SC) technology. Beam physics requires that the spacing between focusing and accelerating com-ponents be minimized. This paper presents the design of a compact Beam Position Monitor (BPM) intended tomeasure the transverse position of short (1.5 mm) low β (<0.15) proton or deuteron beams. The BPM compo-nents must be cleanable to avoid degrading the SC cavity performance. The cleaning of the space behind theelectrostatic pickup button, the minimization of BPM length, and matching the impedance to a 50Ω transmis-sion line are of particular concern for our application. Also, different electrode shapes were studied to obtainthe highest sensitivity to beam position. All simulations were done using the Wakefield-solver of CST-ParticleStudio.

TUPB088 Diagnostics for Ultra-bright Electron Beams – A.Y. Murokh (RadiaBeam), G. Andonian, S. Boucher, M. Ruelas,R. Tikhoplav (RadiaBeam)Emergence of advanced acceleration applications and 4th Generation light sources places unprecedented de-mand on the precision and utility of electron beam diagnostics. RadiaBeam Technologies develops and mar-kets high resolution transverse and longitudinal beam profile diagnostics for electron beam laboratories in theUS, Asia and Europe. The overview is presented of the R&D efforts to further enhance diagnostic capabili-ties beyond the state-of-the art, including recent experimental results with a single shot THz interferometer,X-band deflecting cavity, and innovative beam imaging techniques presently under development.

TUPB089 Waveguide System R&D for the ILC Klystron Cluster Scheme – C.D. Nantista (SLAC), C. Adolphsen, F. Wang(SLAC)The Klystron Cluster Scheme (KCS)* was developed as a solution for powering the main linacs of an Interna-tional Linear Collider (ILC) without parallel service tunnels. It entails combining rf from groups of 20-30 ten-megawatt L-band klystrons in surface buildings into overmoded circular waveguides and plumbing it down toand along the linac tunnel. Power is then tapped off in equal fractions at intervals over roughly a kilometer tobe distributed to local groups of cavities. An R&D program was undertaken to demonstrate the feasibility ofaspects of this scheme. A 10 m run of the 0.48 m diameter TE01 mode main waveguide has been fabricated, aswell as prototypes of the coaxial tap-off (CTO)* device invented to couple power into and out of it. Cold testshave been performed, as well as pressurized high power tests, including transmission of the few megawattsavailable and resonant operation to build up peak SW fields equivalent to those of the 300 MW level TW itmight see in the ILC. We describe our components, test results and the recent expansion to a 75 m waveguiderun, including a new required TE01 90o bend, powered by a 10 MW multi-beam klystron

TUPB090 Development of Permanent Magnet Focusing System for Klystrons – Y. Fuwa (Kyoto ICR), Y. Iwashita,H. Tongu (Kyoto ICR) S. Fukuda, S. Michizono (KEK)The Distributed RF System (DRFS) for the International Linear Collider (ILC) requires thousands of klystrons.The failure rate of the power supply for solenoid focusing coil of each klystron may be a critical issue for aregular operation of the ILC. A permanent magnet beam focusing system can increase reliability and eliminatetheir power consumption. Since the required magnetic field is not high in this system, inexpensive anisotropicferrite magnets can be used instead of magnets containing rare earth materials. In order to prove its feasibility,


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a test model of a permanent magnet focusing beam system is constructed and a power test of the klystron forDRFS with this model is under preparation. The results of magnetic field distribution measurement and thepower test will be presented.

TUPB091 176 MHz Solid State Microwave Generator Design – A.Yu. Smirnov (Siemens Research Center), K.I. Nikolskiy(Siemens Research Center) O. Heid, T.J.S. Hughes (Siemens AG)This paper concerns the R&D work upon design of a compact RF amplifier to be used for superconducting CWcavities. The machine under development will operate at 176 MHz with output power of 25 kW in continu-ous wave regime. It consists of 48 push-pull PCB modules (approx. 500W output power each), connected inparallel to several radial filter rings, which both allow class-F operation and combine the power from the mod-ules, delivering it to a single 50 Ω coax cable. The CST simulations and the results of 324 MHz test prototypemeasurements are presented.

TUPB092 Development of RF High Power Amplifiers 10 kW and 15 kW – B. Kaizer (Soreq NRC), I. Fishman (Soreq NRC)Soreq NRC initiated the establishment of SARAF - Soreq Applied Research Accelerator Facility. SARAF is basedon a continuous wave (CW), proton/deuteron RF superconducting linear accelerator with variable energy (5–40 MeV) and current (0.04-5 mA). RF power to each cavity is driven by a High Power Solid State Amplifiers. Thepaper outlines the design concept of the 10 and 15 kW at 176 MHz power amplifiers that were designed, built,and 10 kW successfully tested. 15 kW is now under construction. The amplifiers are combined from basic 5.5kW compact 19" 7U water cooled drawer.

TUPB093 Compact 4 kW Variable RF Power Coupler for FRIB Quarter-wave Cavities – M.P. Kelly (ANL), S.V. Kutsaev(ANL) J.L. Crisp, L.L. Harle (FRIB)A new compact 4 kW power coupler has been designed and prototyped at Argonne National Laboratory incollaboration with Michigan State University. The coupler is intended for use on the β=0.085 80.5 MHz super-conducting quarter-wave cavities for the FRIB driver linac and also for the planned ReA6 quarter-wave cavitycryomodule. The design has a cold RF window and a 3 cm variable bellows section. The 16 cm overall lengthof the RF window and bellows facilitates a simple and compact installation onto the cavity inside the cleanroom. A prototype have been cold tested with high power under realistic conditions at Argonne and results arepresented.

TUPB094 High Power Tests Bench for the TRASCO RFQ Coupler – E. Fagotti (INFN/LNL), L. Antoniazzi, F. Grespan,A. Palmieri (INFN/LNL) M. Desmons (CEA/DSM/IRFU)The 352.2 MHz 7.13 m long TRASCO RFQ requires an overall amount of 900 kW CW RF power in order to deliverthe 40 mA proton beam from the initial energy of 80 keV to the final energy of 5 MeV. For such a purpose asystem of eight compact (ϕext=38 mm, ϕint=19.4 mm) loop-based couplers was designed. In a first phase,only the first two (out of six) modules of the RFQ were tested at full power. Therefore only two (out of eight)couplers were used. In order to completely characterize these couplers, a dedicated test bench was prepared,consisting of a bridge waveguide and diagnostics (reflected power, vacuum, arc detectors etc.), onto which acouple of couplers was connected for transmission measurements. Each coupler was tested with a forwardpower of up to 140 kW. The description of the experimental setup and procedure, as well as the main results ofthe conditioning procedure will be reported in this paper.

TUPB095 Design of Coupler for Direct Coupled Amplifier to Drift Tube Linac Cavities of the Injector RILAC2 forRIKEN RI Beam Factory – K. Suda (RIKEN Nishina Center), S. Arai, Y. Chiba, O. Kamigaito, M. Kase, H. Okuno,N. Sakamoto, Y. Watanabe, K. Yamada (RIKEN Nishina Center)A new linac RILAC2 was constructed at RIKEN RI Beam Factory as an injector for very heavy ions such as ura-nium and xenon of a high mass to charge ratio m/q ∼ 7, but high intensity ions can be extracted from an ionsource. Three drift tube linac cavities, operate in continuous wave mode at 36.5 MHz, have been designedand built. In order to reduce an installation area, and to save a construction cost, we adopted a direct cou-pling method for a power amplifier without using a long transmission line. A complicated design procedurewas performed in order to take into account a change of resonant frequency of the cavity caused by a capaci-tance of a power tube used in the amplifier. A design of the coupler, as well as the cavity was performed usinga three-dimensional electromagnetic calculation code, CST Microwave Studio (MWS). The measured inputimpedance seen from the amplifier (700 – 1100 Ω) was reproduced well by the calculation of MWS. Also, inorder to examine MWS, a case of a coupling with 50 Ω were calculated. The coupling conditions obtained byMWS were compared with the measurement and a calculation with a lumped circuit model.

TUPB097 C-band Pulse Compression and some Components for Shanghai Soft-XFEL – C.P. Wang (SINAP)A compact soft X-ray free electron laser facility is presently being constructed at shanghai institute of appliedphysics (SINAP), Chinese academy of science in 2012 and will be accomplished in 2014. This facility requiresa compact linac with a high-gradient accelerating structure for a limited overall length less than 230 m. Thec-band technology which is already used in KEK/Spring-8 linear accelerator is a good compromise for thiscompact facility and a c-and traveling-wave accelerating structure was already fabricated and tested at SINAP,so a c-band pulse compression will be required. AND a SLED type RF compression scheme is proposed forthe C-band RF system of the soft XFEL and this scheme uses TE0.1.15 mode energy storage cavity for high Q-energy storage. The C-band pulse compression under development at SINAP has a high power gain about 3.1and it is designed to compress the pulse width from 2.5 µs to 0.5 µs and multiply the input RF power of 50 MWto generate 160 MW peak RF power, and the coupling coefficient will be 8.5. It has three components: 3 dBcoupler, mode convertors and the resonant cavities.


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02 Proton and Ion Accelerators and ApplicationsTUPB099 Input Coupler of the J-PARC DTL – F. Naito (KEK), K. Nanmo, H. Tanaka (KEK) K. Hirano, T. Ito (JAEA/J-PARC)

Each tank of J-PARC DTL has two input couplers. The coupler has a movable coupling loop with an capacitiveelement which increase the coupling with the tank. The loop position is the outside of the tank, where is theatmosphere. The tank vacuum is kept by the ceramic window on the wall for the coupler port. The ceramicis made of Aluminum oxide of 99.7 % purity. RF properties and the mechanical structure of the coupler weredesigned adequately in order to achieve the desired performance. We will report the design of the coupler indetail and the experiences for the practical operation of the DTL.

TUPB100 Recovery and Status Report of DTL and SDTL for the J-PARC After Earthquake – T. Ito (JAEA/LINAC), K. Hi-rano, T. Morishita (JAEA/LINAC) H. Asano (JAEA/J-PARC) F. Naito, K. Nanmo (KEK)The J-PARC facilities had big damages because of the earthquake on March 11, 2011. The J-PARC linac in thetunnel had also damages. For instance the alignment of the cavity was deformed more than 40 mm and therehad been observed about 0.2 mm in horizontal direction for a few DTs in the DTL. However, as the result of therecovery work which includes the re-alignment and re-conditioning of whole cavities, we were able to restartthe beam acceleration of the linac. The stability of the DTL and SDTL has returned to the state before the earth-quake except for a few tanks of SDTL. In this paper, we will present the recovery works from the earthquakeand the operating status of the DTL and the SDTL.

TUPB101 Beam Loss Occurred at DTL Cavity in J-PARC Linac – A. Miura (JAEA/J-PARC), K. Hirano, T. Ito, T. Maruta(JAEA/J-PARC) M. Ikegami (J-PARC, KEK & JAEA) T. Miyao, F. Naito, K. Nanmo (KEK)The beam operation of J-PARC linac was suspended until December 2011 due to the damage by the Tohokuearthquake in March 2011. After resumed the operations, we measured the residual radiation along with thebeam line during a short interval. Because the higher residual radiation was detected at the surface of drifttube linac (DTL) cavity by radiation survey, we installed the scintillation beam loss monitors (BLM) at thepoints where the higher radiation was detected to understand the cause of the radiation. Even the DTL sectionis low energy part of the linac, fine structure of the beam loss was observed by the scintillation BLM. And wemeasured the beam loss occurred at the DTL with the parameters of beam orbit and cavity settings. Also, theBLM is employed for the linac tuning. In this paper, the result of the radiation measurement and beam losssignals obtained by the scintillation BLMs are presented.

03 TechnologyTUPB102 Design and Performances of Phase Monitor in J-PARC Linac – A. Miura (JAEA/J-PARC) Z. Igarashi, T. Miyao

(KEK) M. Minoru (MELCO SC)J-PARC linac employs a fast current transformer (FCT) as a beam phase monitor to calculate the beam energyby time-of-flight method. We have installed and used 61 FCTs in the current beam line. Because the phasemeasurements at additional 41 points in the future ACS sections are required for the energy upgrade projectwith adding 21 ACS (Annular Coupled Structure) cavities, we stared the design and fabrication of FCTs as thephase measurement devices. In addition, J-PARC linac employs the 4-stripline beam position monitors (BPMs)for the beam position measurement. It has been considered that the signals from striplines of BPM would beuseful for a phase measurement. A phase measurement using a BPM has been successfully conducted. In orderto evaluate the performances of the FCT, the signal sensitivity and cut-off frequency of newly fabricated FCTare measured. Also, these data of the BPM are also measured to be compared with the data of FCT. Based on theresults of the comparing both measurements, the superiority of both monitors for beam phase measurementis discussed.

02 Proton and Ion Accelerators and ApplicationsTUPB103 CSNS DTL Prototyping and RF Tuning – H.C. Liu (IHEP), Q. Chen, S. Fu, K.Y. Gong, A.H. Li, J. Peng, Y.C. Xiao,

X. Yin (IHEP)The 324 MHz Alvarez-type Drift Tube Linac (DTL) for the China spallation neutron source will be used to ac-celerate the H- ion beam of up to 15 mA peak current from 3 to 80 MeV. It consists of four independent tanks, ofwhich the average length is about 8.6 m. Each tank is divided into three short unit tanks about 2.8 m in lengthfor easy manufacture. A full-scale prototype of the first unit tank with 28 drift tubes containing electromag-netic quadrupoles has been constructed to validate the design and to demonstrate the technology. The overallfeatures of the prototype in both key technology and RF tuning are presented. In particular, the influence ofthe post couplers was studied in the ramped field DTL.

TUPB104 Study of the Beam Dynamics in the RISP Driver Linac – H.J. Kim (IBS), D. Jeon (IBS) J.G. Hwang (KyungpookNational University)Rare Isotope Science Project (RISP) has been proposed as a multi-purpose accelerator facility for providingbeams of exotic rare isotopes of various energies. The RISP driver linac which is used to accelerate the beam,for an example, Uranium ions from 0.3 MeV/u to 200 MeV/u consists of superconducting RF cavities and warmquadrupole magnets for focusing heavy ion beams. Requirement of the linac design is especially high foracceleration of multiple charge beams. In this paper, we present the requirements of dynamic errors andcorrection schemes to minimize the beam centroid oscillation and preserve beam losses under control.


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TUPB105 First Operation of the Brookhaven EBIS as the Heavy Ion Preinjector for RHIC – J.G. Alessi (BNL), E.N. Beebe,A.I. Pikin, D. Raparia (BNL)During the 2012 RHIC run cycle, the EBIS-based heavy ion preinjector provided U39+, Au32+ and Cu11+ ions forthe RHIC physics program. The preinjector was operated for ∼2.5 months continuously. Intensities deliveredto the Booster synchrotron were∼109 U39+ ions/pulse, ∼1.5·109 Au32+ ions/pulse, and∼6·109 Cu11+ ions/pulse,in ∼20 µs pulses. When providing Au and Cu for asymmetric collisions in RHIC, both species were alwaysavailable, with a switching time between species of 1 second. The performance and operational experience ofthis new preinjector will be presented.

TUPB107 Amplitude and Phase Control of the Accelerating Field in the ESS Spoke Cavities – V.A. Goryashko (PrivateAddress) R.J.M.Y. Ruber, R.A. Yogi, V.G. Ziemann (Uppsala University)We report about numerical simulations of the accelerating field dynamics in the ESS spoke cavity in the pres-ence of the beam loading and Lorentz detuning. A slow feedforward is used to cure the Lorentz detuningwhereas a fast feedback through a signal oscillator and cavity pre-detuning technique are applied to eliminatethe beam loading effect. An analysis performed with a Simulink model shows that a combination of feedfor-ward, feedback and cavity pre-detuning result in a substantially shorter stabilization time of the field voltageand phase on a required level as compared to a control method using only the feedforward and feedback. Thelatter allows one to obtain smaller magnitude but longer duration of deviations of the instantaneous voltageand phase from the required nominal values. As a result, a series of cavities only with feedforward and feedbackneeds an extra control technique to mitigate a cumulative systematic error rising in each cavity. In addition, atechnique of adiabatic turning off of the RF power in order to prevent a high reflected power in the case of asudden beam loss is studied.

03 TechnologyTUPB108 Uppsala High Power Test Stand for ESS Spoke Cavities – R.A. Yogi (Uppsala University), T.J.C. Ekelöf,

V.A. Goryashko, L. Hermansson, R. Santiago Kern, V.G. Ziemann (Uppsala University) D.S. Dancila, A. Rydberg(Uppsala University, Department of Engineering Sciences) K.J. Gajewski, T. Lofnes, R. Wedberg (TSL) R.J.M.Y. Ru-ber (CERN)The European Spallation Source (ESS) is one of the world’s most powerful neutron source. The ESS linac willaccelerate 50 mA of protons to 2.5 GeV in 2.86 ms long pulses at a repetition rate of 14 Hz. It produces a beamwith 5 MW average power and 125 MW peak power. ESS Spoke Linac consists of 28 superconducting spokecavities, which will be developed by IPN Orsay, France. These Spoke Cavities will be tested at low power at IPNOrsay and high power testing will be performed at a test stand which will be set up at Uppsala University. Thetest stand consists of tetrode based RF amplifier chain at 352 MHz, 350 kW power and related RF distribution.Outputs of two tetrodes shall be combined with the hybrid coupler to produce 350 kW power. Preamplifier fora tetrode shall be solid state amplifier. As the spoke cavities are superconducting, the test stand also includeshorizontal cryostat, Helium liquefier, test bunker etc. The paper describes features of the test stand in details.


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WE1A — Invited Oral PresentationsChair: S. Nath (LANL)

01 Electron Accelerators and ApplicationsWE1A01

08:30ERL-Based Light Source Challenges – Y. Kobayashi (KEK)The challenges of the design and technology for the future Energy Recovery Liancs will be reviewed: electronsources, injector, SCRF cavities and cryomodules, commissioning.

WE1A0209:00

Status and Future of the CLIC Study – R. Corsini (CERN)The CLIC study will deliver the CDR before the conference. It will be input for the European strategy group.This talk will present a summary of the status and of the programme for the next period.

WE1A0309:20

Application of X-band Linacs – G. D’Auria (ELETTRA)This talk will describe the use of normal conducting X-band linacs in many applications that include compactand bright drivers in future light sources, higher-harmonic RF system in FERMI@ELETTRA and PSI, the CLIClinear collider, and compact medical accelerators.

WE1A0409:50

The ARIEL Superconducting Electron Linac – S.R. Koscielniak (TRIUMF, Canada’s National Laboratory forParticle and Nuclear Physics)This talk focuses on the SC linac layout of the ARIEL facility at TRIUMF. In particular the modifications to theILC type, 9-cell cavities and cryo-modules are discussed, made to adapt these to CW operation.

WE1A0510:10

Linac-Based Laser Compton Scattering X-Ray and Gamma-Ray Sources – R. Hajima (JAEA)Laser Compton scattering (LCS) light sources can provide high-energy photons from keV to MeV range. Manyresearch and development projects of linac-based LCS sources are carried on. For the photon energies of tenskeV, linac-based LCS sources realize laboratory-size X-ray sources, of which performance can be comparableto synchrotron light sources. Linac-based LCS also realizes unprecedented gamma-ray sources with bettermonochromaticity than ring-based LCS sources. This talk will review linac-based LCS source in the world.


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WE2A — Invited Oral PresentationsChair: H.W. Zhao (IMP)

03 TechnologyWE2A01

11:00RF Power Production at the Two Beam Test Stand at CERN – I. Syratchev (CERN)The generation of short (250 ns) high peak power (135 MW) RF pulses by decelerating the high current (100 A)bunched (12 GHz) drive beam is one of the key components in the CLIC two beam acceleration scheme. Recenttests with drive beam deceleration at CERN’s CTF3, using specially developed 1 m long CLIC Power Extractionand Transfer Structure (PETS) operated in re-circulation regime have successfully demonstrated this concept.The results of these tests are presented.

WE2A0211:30

Solid State Marx Modulators for Emerging Applications - CLIC, ESS, ILC & Project X – M.A. Kemp (SLAC)A class of intelligent, Marx-topology modulators are under development at SLAC. These modulators combinenumerous advanced features that could be employed in any significant new HPRF installation. The talk willdescribe the design features and operational experience.

WE2A0311:50

High-Field Short-Period Microwave Undulators – J. Neilson (SLAC)Inspired by recent developments in low-loss overmoded components and systems for ultra-high power RF sys-tems, we explored several overmoded waveguide systems that could function as RF undulators. One promisingstructure is a corrugated waveguide system operating using the balanced hybrid HE11 mode. Initial calcula-tions indicate that such a system can be operated at relatively low power levels while obtaining large valuesfor the undulator parameters K∼1. RF surface fields are typically low enough to permit superconducting op-eration. This technology can realize an undulator with short wavelengths and gives dynamic control of theundulator parameters including polarization. The scaling laws are verified through simulations and experi-mental data. The single electron dynamics, for both linearly polarized and circularly polarized (CP) standingwave undulator synthesized from this corrugated waveguide, will be presented. We will present our optimiza-tion strategy for such a geometry which not only need to taper the field profile but also have to maintain lowlosses and low surface fields.


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TH1A — Invited Oral PresentationsChair: P.N. Ostroumov (ANL)

03 TechnologyTH1A01

08:30Results Achieved by the S1-Global Collaboration for ILC – H. Hayano (KEK)The S1-Global collaboration (scope and plans presented at Linac10) ended successfully in 2011. In the S1-Global experiment several variants of ILC components (e.g. cavities, tuners, modules, couplers) proposed byall SCRF collaborators worldwide have been extensively tested and their performances compared, in order tobuild consensus for the technical choices towards the ILC TDR and to develop further the concept of plug-compatible components for ILC. The experiment has been carried at KEK with contribution of hardware andmanpower from all collaborators.

TH1A0209:00

Compact Superconducting Crabbing and Deflecting Cavities – S.U. De Silva (ODU) S.U. De SilvaRecently, new geometries for superconducting crabbing and deflecting cavities have been developed that havesignificantly improved properties over those the standard TM110 cavities. They are smaller, have low sur-face fields, high shunt impedance and, more importantly for some of them, no lower-order-mode with a well-separated fundamental mode. This talk will present the status of the development of these cavities.

TH1A0309:30

Superconducting RF Spoke Cavities for Electron and High-Velocity Proton Linacs – J.R. Delayen (ODU)Spoke resonantors are currently under development for many proton machines but these structures are alsoconsidered for high beta electron linacs as well. These structures compare well to traditional elliptical cavities.

TH1A0409:50

Superconducting Linac and Associated Developments at IUAC Delhi – A. Roy (IUAC)A superconducting linear accelerator system consisting of a series of independently phase locked niobiumquarter wave resonators has been developed as a booster of heavy ion beams available from the existing 15UDPelletron accelerator. Two superconducting linac booster modules having eight niobium quarter wave res-onators (QWRs) each have been installed and are fully operational for regular scheduled experiments. Thethird module is being added to the system. A new high current injector has been planned to couple to thesuperconducting linac. For this a high temperature superconducting electron cyclotron resonance ion source(HTS-ECRIS) was designed, fabricated and installed successfully. A radio frequency quadrupole (RFQ) accel-erator is being developed for accelerating accelerate ions from the ECR (A/Q ∼ 6) to an energy to of about 180keV/A. The beams will then be accelerated further by drift tube linacs (DTL) to the required velocity to injectthem to the existing superconducting linac booster. Prototypes of both these have been tested for power andthermal studies. Details of these developments and associated systems will be presented.

04 Extreme Beams, Sources and Other TechnologiesTH1A05

10:10Emittance-partitioning Strategies for Future Accelerator Applications – K. Bishofberger (LANL)The prevailing limit on many linear-accelerator applications is the transverse emittances of the beam. For ex-ample, XFEL and collider performance depend on transverse emittances more than longitudinal, which for anXFEL can be up to three orders of magnitude larger than in the transverse dimensions. Recent theoretical treat-ment of eigen-emittance manipulations has offered a new capability to generate, in principle, extraordinarilybright electron beams. Specific strategies are explored which partition the six-dimensional phase space with aspecific goal of deriving low transverse emittances, and examples leading to transverse emittances of 0.1 – 0.2µm for 250 pC are provided.


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TH2A — Invited Oral PresentationsChair: S. Fu (IHEP)

02 Proton and Ion Accelerators and ApplicationsTH2A01

11:00Parameter Choice for the ESS Linac Design – M. Lindroos (ESS)The European Spallation Source (ESS) is a 5 MW, 2.5 MeV long pulse proton machine. It represents a big jumpin power compare to the existing spallation facilities. The design phase is well under way, with the delivery ofa Conceptual Design Report expected in 2012, and a Technical Design Report in 2013. Why and how the 5 MWgoal influences the parameter choice will be describe.

TH2A0211:30

SPIRAL2 Accelerator Construction Progress (GANIL) – P. Bertrand (GANIL)The SPIRAL2 superconducting accelerator installation starts in 2012. The major components have been testedin the various partner laboratories, and the building construction is well engaged. The management of theinterfaces between process and buildings is a strategic point in an underground project with strong space con-straints. This contribution will describe the performances of the various components of the SPIRAL2 acceler-ator, and the methodology put in place in order to insure the integration of the process inside the buildings.

03 TechnologyTH2A03

11:50Design, Construction and Commissioning of the Linac4 Accelerating Structures – F. Gerigk (CERN)The Linac4 project at CERN is at an advanced state of construction. Prototypes of the different types of ac-celerating structures (RFQ, DTL, CCDTL and pi-mode structures) have been built and are presently tested.This paper gives the status of the cavity production and reviews the RF and mechanical design of the variousstructure types. Furthermore the production and the first test results shall be presented.


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TH3A — Invited Oral PresentationsChair: S. Choroba (DESY)

01 Electron Accelerators and ApplicationsTH3A01

13:40Status of ILC – A. Yamamoto (KEK)A review of the ILC project with emphasis on the changes in the technical progress report.

TH3A0214:00

JLAB Upgrade – F.C. Pilat (JLAB)Two new cryomodules and an extensive upgrade of the bending magnets at Jefferson Lab has been recentlycompleted in preparation for the full energy upgrade in about one year.

TH3A0314:20

ERL-Based Lepton-Hadron Colliders: ERHIC and LHeC – F. Zimmermann (CERN)This talk will review hadron-ERL collider projects. The LHeC is a plan to collide the LHC beam with electrons orpositrons. One scheme for this facility is based on a superconducting recirculating linac with energy recovery.The electron hadron collider eRHIC will collide polarized and unpolarized electrons with a current of 50 mAand energy in the range of 5 GeV to 30 GeV with hadron beams, including heavy ions or polarized light ions ofthe RHIC storage ring. The electron beam will be generated in an energy recovery linac contained inside theRHIC tunnel, comprising six passes through two linac section of about 2.5 GeV each.

04 Extreme Beams, Sources and Other TechnologiesTH3A04

14:40Plasmas, Dielectrics and the Ultrafast: First Science and Operational Experience at FACET – C.I. Clarke(SLAC)FACET is an accelerator R&D test facility that has been recently constructed at SLAC. This talk will describe theFACET design, initial operating experience and first science from the facility.


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13-Sep-12 15:00 – 16:00 Oral Hall B

THPLB — Poster Orals

02 Proton and Ion Accelerators and ApplicationsTHPLB01

14:50Linac Construction for China Spallation Neutron Source – S. Fu (IHEP), J. Li, H.C. Liu, H.F. Ouyang, X. Yin(IHEP)Construction of China Spallation Neutron Source(CSNS) has been launched in September 2011. CSNS accel-erator will provide 100kW proton beam on a target at beam energy of 1.6GeV. It consists of an 80MeV H- linacand 1.6GeV rapid cycling synchrotron. Based on the prototyping experience, CSNS linac, including the frontend and four DTL tanks, has finalized the design and started procurement. In this paper, we will first presentan outline of the CSNS accelerator in its design and construction plan. Then the major prototyping results ofthe linac will be presented. Finally the linac construction progress in recent will be updated.

THPLB0214:55

Performance of Ferrite Vector Modulator Control Loops in the LLRF System of the Fermilab HINS 6-CavityTest – P. Varghese (Fermilab), B. Chase, E. Cullerton (Fermilab)The High Intensity Neutrino Source (HINS) 6-cavity test is a part of the Fermilab HINS Linac R&D programfor a low energy, high intensity proton/H- linear accelerator. One of the objectives of the 6-cavity test is todemonstrate the use of high power RF Ferrite Vector Modulators(FVM) for independent control of multiplecavities driven by a single klystron. The beamline includes an RFQ and six cavities. The LLRF system providesa primary feedback loop around the RFQ and the distribution of the regulated klystron output is controlledby secondary learning feed-forward loops on the FVMs for each of the six cavities. The feed-forward loopsprovide pulse to pulse correction to the current waveform profiles of the FVM power supplies to compensatefor beam-loading and other disturbances. The learning feed-forward loops are shown to successfully controlthe amplitude and phase settings for the cavities well within the 1 % and 1 degree requirements specified forthe system.

THPLB0315:00

Front-End Linac Design and Beam Dynamics Simulations for MYRRHA – C. Zhang (IAP), H. Klein, D. Mäder,H. Podlech, U. Ratzinger, A. Schempp, R. Tiede, M. Vossberg (IAP)As front end of the driver linac for the MYRRHA facility in Mol, Belgium, a 176 MHz, CW (Continuous Wave)linac has been designed for accelerating a 5 mA proton beam to 17 MeV. To reach the extremely high reliabil-ity defined by an Accelerator-Driven System (ADS), the layout design and the beam dynamics design of theMYRRHA front-end linac have been carefully optimized. In addition, intensive error studies and simulation-code benchmarking activities have been performed. This paper summarizes the design and simulation results.

THPLB0415:05

Preliminary Study of Proton Beam Transport in a 10 MeV Dielectric Wall Accelerator – J. Zhu (CAEP/IFP),S. Chen, J. Deng, Y. Shen, J. Shi, W.D. Wang, L.S. Xia, H. Zhang, L.W. Zhang (CAEP/IFP)A novel proton accelerator based on Dielectric Wall Accelerator (DWA) technology is being developed at Insti-tute of Fluid Physics (IFP). The accelerating gradient will be 20 MV/m or even higher based on current highgradient insulator (HIG) performance. Theoretical study and numerical simulation of accelerating the pro-ton beam to 10 MeV by virtual traveling wave method is presented in this paper. The beam dynamics underaccelerating pulse with or without flattop is discussed.

THPLB0515:10

R&D Activities on High Intensity Superconducting Proton Linac at RRCAT – S.C. Joshi (RRCAT), J. Dwivedi,P.D. Gupta, P.R. Hannurkar, P. Khare, P.K. Kush, G. Mundra, A. Puntambekar, S.B. Roy, P. Shrivastava (RRCAT)Raja Ramanna Centre for Advanced Technology (RRCAT), Indore has taken up a program on developmentof 1 GeV high intensity superconducting proton linac for Spallation Neutron Source. This will require severalmulti-cell superconducting cavities operating at different RF frequencies. To start with, a number of single-cellprototype cavities at 1.3 GHz have been developed in high RRR bulk niobium. These single-cell cavities haveexhibited high quality factor and accelerating gradients. Superconducting properties of niobium are beingstudied for varying composition of impurities and different processing conditions. Development activity onsolid state RF amplifiers to power the SCRF cavities at various RF frequencies is being pursued. A building hasbeen constructed to house the SCRF cavity fabrication and processing facility. To characterize SCRF cavity, a2 K Vertical Test Stand is being set up including a 2 K cryostat, RF power supply and data acquisition system.Design activities for cryomodule and large 2 K cryostat for Horizontal Test Stand are also under progress. Thepaper will discuss the status of above R&D activities and infrastructure development at RRCAT.

THPLB0615:15

The New Option for a Front End of Ion Linac – A.D. Kovalenko (JINR) A. Kolomiets (ITEP)The standard ion linac front-end consisting of RFQ, two tanks of accelerating IH-structures, MEBTs withmatching and focusing elements is modified to achieve better performances. Special vane section that pro-vides the same beam transformation as debuncher and quadrupole triplet is added within the RFQ tank,whereas superconducting focusing elements, solenoids, for example, are used between the IH - structure tanks.Test frond end was designed to provide the output beam energy up to 4 MeV/u for the particles with charge-to-mass ratio of 0.16 < q/m ≤ 1. Results of beam dynamics simulation are presented. Possible application ofthe considered scheme for the NICA facility at JINR (Dubna, Russia) is discussed.


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THPLB0715:20

Experience with a 4-Rod CW Radio Frequency Quadrupole – P. Gerhard (GSI), W.A. Barth, L.A. Dahl, W. Hart-mann, G. Schreiber, W. Vinzenz, H. Vormann (GSI)Since 1991 the High Charge State Injector (HLI) provides heavy ion beams for the linear accelerator UNILAC atGSI*. It is equipped with an ECR ion source and an RFQ-IH linac which accelerates highly charged ion beamswith high duty factor of up to 30% to 1.4 MeV/u for further acceleration in the Alvarez DTL of the UNILAC.Main user of these beams is the Super Heavy Element (SHE) research, one of the outstanding projects at GSI**.Experiments like TASCA and SHIP strongly benefit from the high average beam intensities. After two decadesof successful operation the four-rod Radio Frequency Quadrupole (RFQ) accelerator was replaced in 2010 bya newly designed RFQ of the same type**. Besides higher beam transmission, the principal intention of thisupgrade was to raise the duty factor up to 100%, since the HLI is foreseen as injector for the upcoming cw linacdedicated to the SHE program**. Commissioning and operational experience from the first years revealedthat this goal could not be reached easily. In this paper we present the RFQ design, commissioning results,operational experience and future activities.

THPLB0815:25

High-Power RF Conditioning of the TRASCO RFQ – E. Fagotti (INFN/LNL), L. Antoniazzi, F. Grespan, A. Pal-mieri (INFN/LNL) M. Desmons (CEA/DSM/IRFU)The TRASCO RFQ is designed to accelerate a 40 mA proton beam up to 5 MeV. It is a CW machine which has toshow stable operation and provide the requested availability. It is composed of three electromagnetic segmentcoupled via two coupling cells. Each segment is divided into two 1.2 m long OFE copper modules. The RFQ isfed through eight loop-based power couplers to deliver RF to the cavity from a 352.2 MHZ, 1.3 MW klystron.After couplers conditioning, the first electromagnetic segment was successfully tested at full power. RFQ cavityreached the nominal 68 kV inter-vane voltage (1.8 Kilp.) in CW operation. Moreover, during conditioning inpulsed operation, it was possible to reach 83 kV inter-vane voltage (2.2 Kilp.) with a 1% duty cycle. The de-scription of the experimental setup and procedure, as well as the main results of the conditioning procedurewill be reported in this paper.

03 TechnologyTHPLB09

15:30Status of E-XFEL String and Cryomodule Assembly at CEA-Saclay – C. Madec (CEA) S. Berry, J.-P. Char-rier, A. Dael, M. Fontaine, Y. Gasser, O. Napoly, Y. Sauce, C.S. Simon, T.V. Vacher, B. Visentin (CEA/DSM/IRFU)A. Brasseur, P. Charon, C. Cloue, S. Langlois, G. Monnereau, J.L. Perrin, D. Roudier, N. Sacepe (CEA/IRFU)As In-Kind contributor to E-XFEL project, CEA is committed to the integration on the Saclay site of the 100cryomodules of the superconducting linac as well as to the procurement of the magnetic shieldings, superin-sulation blankets and 31 cold beam position monitors of the re-entrant type. The assembly infrastructure hasbeen renovated from the previous Saturne Synchrotron Laboratory facility: it includes a 200 m2 clean roomcomplex with 120 m2 under ISO4, 1325 m2 of assembly platforms and 400 m2 of storage area. In parallel,CEA has conducted industrial studies and three cryomodule assembly prototyping both aiming at preparingthe industrial file, the quality management system and the commissioning of the assembly plant, tooling andcontrol equipments. In 2012, the contract of the integration will be placed to a subcontractor. The paper willsummarize the outputs of the preparation and prototyping phases and the up-coming industrial phase.

04 Extreme Beams, Sources and Other TechnologiesTHPLB11

15:40Experimental and Simulation Study of the Long-path-length Dynamics of a Space-charge-dominatedBunch – I. Haber (UMD), B.L. Beaudoin, S. Bernal, R.A. Kishek, T.W. Koeth (UMD)The University of Maryland Electron Ring (UMER) is a low-energy (10 keV) electron facility built to study, ona scaled machine, the long-propagation-length evolution of a space-charge-dominated beam. Though con-structed in a ring geometry to achieve a long path length at modest cost, UMER has observed important space-charge physics directly relevant to linear machines. Examples will be presented that emphasize studies of thelongitudinal dynamics and comparisons to axisymmetric simulations. The detailed agreement obtained be-tween simulation and experiment will be presented as evidence that the longitudinal physics observed is notstrongly influenced by the ring geometry. Novel phenomena such as soliton formation, unimpeded bunch-endinterpenetration, and an instability that occurs after this interpenetration, will be discussed.

THPLB1215:45

Photoinjector SRF Cavity Development for BERL inPro – A. Neumann (HZB), W. Anders, T. Kamps, J. Knobloch(HZB) E.N. Zaplatin (FZJ)In 2010 HZB has received approval to build BERL inPro, an ERL project to demonstrate energy recovery at 100mA beam current by pertaining a high quality beam. These goals place stringent requirements on the SRFcavity for the photoinjector which has to deliver a small emittance 100 mA beam with at least 1.5 MeV kineticenergy while limited by fundamental power coupler performance to about 200 kW forward power. In oderto achieve these goals the injector cavity is being developed in a three stage approach. The current designstudies focus on implementing a normal conducting cathode insert into a newly developed superconductingphotoinjector cavity. In this paper the fundamental RF design calculations concerning cell shape for optimizedbeam dynamics as well as SRF performance will be presented. Further studies concentrate on the HZDR basedchoke cell design to implement the high quantum efficiency normal conducting cathode with the SRF cavity.


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13-Sep-12 16:00 – 18:00 Poster Hall B

THPB — Poster Session

02 Proton and Ion Accelerators and ApplicationsTHPB001 E-Type Cavity Design for the Linear Accelerator with the Electrostatic Undulator – S.M. Polozov (MEPhI),

P.R. Safikanov (MEPhI)The space charge influence to the beam dynamics is the main factor limiting the ion bunchers and low en-ergy linacs beam intensity. New acceleration and focusing methods which can be used for ion beam intensityincrease are under discussion now. One of the ways to increase the limit beam current is the ribbon beamacceleration. So-called linear undulator accelerator (UNDULAC) was proposed by E.S. Masunov * to ribbonbeam bunching and low energy acceleration. The combination of RF end electrostatic fields is uses in one ofthe UNDULAC types. The computer simulation results for the E-type cavity with the electrostatic input willpresent. Different ways of the electrostatic potential input design will discuss. The electrodynamics character-istics of the E-type cavity will consider. Optimization of the electrode configuration for the e-type cavity withthe electrostatic potential input will do.

THPB002 Preliminary Study of Proton Beam Transport in a 10 MeV Dielectric Wall Accelerator – J. Zhu (CAEP/IFP),S. Chen, J. Deng, Y. Shen, J. Shi, W.D. Wang, L.S. Xia, H. Zhang, L.W. Zhang (CAEP/IFP)A novel proton accelerator based on Dielectric Wall Accelerator (DWA) technology is being developed at Insti-tute of Fluid Physics (IFP). The accelerating gradient will be 20 MV/m or even higher based on current highgradient insulator (HIG) performance. Theoretical study and numerical simulation of accelerating the pro-ton beam to 10 MeV by virtual traveling wave method is presented in this paper. The beam dynamics underaccelerating pulse with or without flattop is discussed.

THPB003 R&D Activities on High Intensity Superconducting Proton Linac at RRCAT – S.C. Joshi (RRCAT), J. Dwivedi,P.D. Gupta, P.R. Hannurkar, P. Khare, P.K. Kush, G. Mundra, A. Puntambekar, S.B. Roy, P. Shrivastava (RRCAT)Raja Ramanna Centre for Advanced Technology (RRCAT), Indore has taken up a program on developmentof 1 GeV high intensity superconducting proton linac for Spallation Neutron Source. This will require severalmulti-cell superconducting cavities operating at different RF frequencies. To start with, a number of single-cellprototype cavities at 1.3 GHz have been developed in high RRR bulk niobium. These single-cell cavities haveexhibited high quality factor and accelerating gradients. Superconducting properties of niobium are beingstudied for varying composition of impurities and different processing conditions. Development activity onsolid state RF amplifiers to power the SCRF cavities at various RF frequencies is being pursued. A building hasbeen constructed to house the SCRF cavity fabrication and processing facility. To characterize SCRF cavity, a2 K Vertical Test Stand is being set up including a 2 K cryostat, RF power supply and data acquisition system.Design activities for cryomodule and large 2 K cryostat for Horizontal Test Stand are also under progress. Thepaper will discuss the status of above R&D activities and infrastructure development at RRCAT.

THPB004 Status of the Front End Test Stand Project at Rutherford Appleton Laboratory – D.C. Plostinar (STFC/RAL/ASTeC)The Front End Test Stand (FETS) project currently under construction at Rutherford Appleton Laboratory (RAL)consists of a high brightness, 60 mA H- ion source, a three solenoid Low Energy Beam Transport Line (LEBT),a 3 MeV 4-vane Radiofrequency Quadrupole (RFQ) and a Medium Energy Beam Transport Line (MEBT) with ahigh speed chopper. The generic aim is to demonstrate the production of a high quality, high current, choppedbeam at 3 MeV while exploring various operating conditions. In this paper we present the current project statusas well as future plans and developments.

THPB005 Front-End Linac Design and Beam Dynamics Simulations for MYRRHA – C. Zhang (IAP), H. Klein, D. Mäder,H. Podlech, U. Ratzinger, A. Schempp, R. Tiede, M. Vossberg (IAP)As front end of the driver linac for the MYRRHA facility in Mol, Belgium, a 176MHz, CW (Continuous Wave)linac has been designed for accelerating a 5 mA proton beam to 17MeV. To reach the extremely high reliabil-ity defined by an Accelerator-Driven System (ADS), the layout design and the beam dynamics design of theMYRRHA front-end linac have been carefully optimized. In addition, intensive error studies and simulation-code benchmarking activities have been performed. This paper summarizes the design and simulation results.

THPB006 Post Acceleration of Laser-generated Proton Bunches by a CH-DTL – A. Almomani (IAP), M. Droba, I. Hof-mann, U. Ratzinger (IAP)Laser driven proton beam sources applying the TNSA process show interesting features in terms of energy andproton number per bunch. This makes them attractive as injectors into RF linacs at energies as high as 10MeV or beyond. The combination shows attractive features like a very high particle number in a single bunchfrom the source and the flexibility and reliability of the rf linac to match the needs of a specified application.The approach aims on a very short matching section from the source target into the rf linac by one pulsedsolenoid lens only. A crossbar H-type (CH - structure) is suggested because of its high acceleration gradientand efficiency at these beam energies. It is intended to realize the first cavity of the proposed CH - linac and todemonstrate the acceleration of a laser generated proton bunch within the LIGHT collaboration at GSI Darm-stadt. Detailed beam and field simulations will be presented.


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THPB007 A Pulsed Linac Frontend for ADS Applications – U. Ratzinger (IAP), H. Podlech, A. Schempp, K. Volk (IAP)U. Hagen, O. Heid, T.J.S. Hughes (Siemens AG) H. Hoeltermann (BEVATECH OHG)Quite a number of projects worldwide develop proton driver linacs for neutron sources and other acceleratordriven systems. One trend is to use a high duty factor and superconducting cavities as much as possible.Alternatively, one can aim on short duty factor and count on a continuing rapid development of pulsed rfamplifiers based on power transistor technology. A 500 mA, 5 % duty factor layout of a proton injector ispresented, consisting of a filament driven volume ion source, of a 150 keV transport section and of a 4 m long162 MHz RFQ up to 2 MeV beam energy. Beam dynamics results as well as the technical design will be shown.

THPB008 A Coupled RFQ - DTL Combination for the Neutron Source FRANZ – M. Heilmann (IAP), O. Meusel, D. Mäder,U. Ratzinger, A. Schempp, M. Schwarz (IAP)The Frankfurt neutron source FRANZ will deliver neutrons in the energy range from 1 to 500 keV with highpulsed intensities. A 2 MeV proton beam will produce protons via the 7Li(p,n)7Be reaction. The 175 MHzaccelerator cavity consists of a 4-rod-RFQ coupled with an 8 gap interdigital H-type drift tube section, the totalcavity length being 2.3m. The combined cavity will be powered by one RF amplifier to reduce investment andoperation costs. The inductive power coupler will be at the RFQ part. The coupling into the IH - section isprovided through a large aperture - mainly inductively. By CST - MWS - simulations as well as by an RF - modelthe voltage tuning along the cavity was investigated, and with special care the balance between both cavitysections. A first set of RFQ electrodes should allow to reach beam currents up to 50 mA in cw operation: Thebeam is pulsed with 100 ns, 250 kHz, while the cavity has to be operated cw due to the high rep. rate. Thelayout of the cavity cooling aims on a maximum accessible heat load of 200 kW.

THPB009 Status of CH Cavity and Solenoid Design of the 17 MeV Injector for MYRRHA – D. Mäder (IAP), H. Klein,H. Podlech, U. Ratzinger, C. Zhang (IAP)The multifunctional subcritical reactor MYRRHA (Multi-purpose hybrid research reactor for high-tech appli-cations) will be an accelerator driven system (ADS) located in Mol (Belgium). The first accelerating section upto 17 MeV is operated at 176 MHz and consists of a 4-Rod-RFQ followed by two room temperature CH cavitieswith integrated triplet lenses and four superconducting CH structures with intertank solenoids. Each roomtemperature CH cavity provides about 1 MV effective voltage gain using less than 30 kW of RF power. Thesuperconducing resonators have been optimized for electric peak fields below 30 MV/m and magnetic peakfields below 30 mT. For save operation of the superconducting resonators the magnetic field of the intertanksolenoids has to be less than 50 mT at the CH cavity walls. Different coil geometries have been compared tofind the ideal solenoid layout.

THPB010 Progress in the Construction of Linac4 at CERN – M. Vretenar (CERN), L. Arnaudon, P. Baudrenghien, G. Bel-lodi, C. Bertone, Y. Body, J.C. Broere, O. Brunner, M.C.L. Buzio, C. Carli, J.-P. Corso, J. Coupard, A. Dallocchio,N. Dos Santos, R. Garoby, F. Gerigk, L. Hammouti, K. Hanke, J. Hansen, M.A. Jones, I. Kozsar, J.-B. Lallement,J. Lettry, A.M. Lombardi, L.A. Lopez Hernandez, C. Maglioni, S.J. Mathot, B. Mikulec, D. Nisbet, M.M. Paoluzzi,B. Puccio, U. Raich, S. Ramberger, C. Rossi, N. Schwerg, R. Scrivens, G. Vandoni, J. Vollaire, S. Weisz, Th. Zickler(CERN)As first step of the LHC luminosity upgrade program CERN is building a new 160 MeV H¯ linear accelerator,Linac4, to replace the ageing 50 MeV Linac2 as injector to the PS Booster (PSB). Linac4 is an 86-m long normal-conducting linac made of a 3 MeV injector followed by 22 accelerating cavities of three different types. Thegeneral service infrastructure has been installed in the new tunnel and surface building and its commission-ing is progressing; high power RF equipment is being installed in the hall and installations in the tunnel willstart soon. Construction of the accelerator parts is in full swing involving industry, the CERN workshops and anetwork of international collaborations. The injector section including a newly designed and built H¯ source,a 3-m long RFQ and a chopping line is being commissioned in a dedicated test stand. Beam commissioning ofthe linac will take place in steps of increasing energy between 2013 and 2014. From end of 2014 Linac4 coulddeliver 50 MeV protons in case of Linac2 failure, while 160 MeV H¯ could be injected into the PSB from end of2015; the exact start of the LHC shut-down required for connection will be coordinated with its experiments.

THPB011 Linac4 45keV Proton Beam Measurements – G. Bellodi (CERN), V.A. Dimov, L.M. Hein, J.-B. Lallement,A.M. Lombardi, O. Midttun, R. Scrivens (CERN) P.A. Posocco (Imperial College of Science and Technology, De-partment of Physics)Linac4 is a 160 MeV normal-conducting H- linear accelerator, which will replace the 50 MeV proton Linac(Linac2) as injector for the CERN proton complex. Commissioning of the low energy part - H- source, a 45 keVLow Energy Beam Transport line (LEBT), a 3 MeV RFQ and a Medium Energy Beam Transport (MEBT) line -will start in fall 2012 on a dedicated test stand installation. In preparation to this, preliminary measurementswere taken in the past few months using a 45 keV proton source and a temporary LEBT setup, with the aimof characterising the output beam by comparison with simulations. This also allowed a first verification ofthe diagnostics instrumentation and acquisition software tools. Measurements of beam profile, emittance andintensity were taken after the source, after the first and after the second LEBT solenoids respectively. Particledistributions were reconstructed from emittance scans and used as input to simulation studies of the beamtransport through the line. Comparison of the results with the measurements allowed an experimental valida-tion of the LEBT (in terms of misalignments and calibration points) and qualification of the beam at the sourceoutput.


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THPB012 High Resolution Emittance Measurements at SNS Front End – A.P. Zhukov (ORNL)Spallation Neutron Source (SNS) linac accelerates an H- beam from 2.5MeV up to 1GeV. Recently the emittancescanner in the MEBT (2.5 MeV) was upgraded. In addition to the slit - harp measurement we now can use aslit installed on the same actuator as the harp. In combination with a faraday cup located downstream in DTLpart of the linac it represents a classical slit-slit emittance measurement device. While a slit – slit scan takesmuch longer time, it is immune to harp related problems such as wire cross talk and thus looks promising foraccurate halo measurements. Time resolution of the new device seems to be sufficient to estimate amount ofthe beam in the chopper gap (the scanner is downstream of the chopper) and probably measure its emittance.The paper describes initial measurements with new device and some model validation data.

THPB013 Diagnostics Tools for Beam Halo Investigation in SNS Linac – A.V. Aleksandrov (ORNL)Uncontrolled beam loss is the major concern in operation of a high intensity hadron linac. A low density cloudof particles with large oscillation amplitudes, so called halo, can form around the dense regular beam core.This halo can be direct or indirect cause of beam loss. There is an experimental evidence of halo growing inSNS linac and limiting further reduction of beam loss. A set of tools is being developed for detecting of thehalo and investigating its origin and dynamics. The set includes high resolution emittance measurements inthe injector, laser based emittance measurements at 1 GeV, and high resolution profile measurements alongthe linac. We will present our experience with useful measurement techniques and data analysis algorithms aswell as current understanding of the halo dynamics in SNS linac.

THPB014 Lattice Design and Beam Dynamics Studies for Project X – N. Solyak (Fermilab), J.-P. Carneiro, V.A. Lebedev,J.-F. Ostiguy, A. Saini (Fermilab)Fermilab is developing Project-X, a high intensity superconducting H- machine for high energy physics exper-iments. The first stage is 1 mA average, 3 GeV linac operating in CW mode. Its front-end comprises a LEBTsection with magnetic focusing and pre-chopping, a 162.5 MHz RFQ and ∼10 m long MEBT section whichincludes a high bandwidth, bunch-by-bunch capable chopper. The latter extracts, out of a nominal 5 mApeak 162.5 MHz train, and arbitrary bunch structure able to meet the requirements of different experiments.Acceleration from 2.1 MeV to 3 GeV is accomplished through five families of SRF cavities operating at threefrequencies: Half-wave resonators (162.5 MHz), spoke cavities (two families at 325 MHz) and elliptical cavities(two families at 650 MHz). In this contribution, we present the status of the CW linac lattice design and resultsfrom recent beam physics studies.

THPB015 Performance of Ferrite Vector Modulator Control Loops in the LLRF system of the Fermilab HINS 6-CavityTest – P. Varghese (Fermilab), B. Chase, E. Cullerton (Fermilab)The High Intensity Neutrino Source (HINS) 6-cavity test is a part of the Fermilab HINS Linac R&D programfor a low energy, high intensity proton/H- linear accelerator. One of the objectives of the 6-cavity test is todemonstrate the use of high power RF Ferrite Vector Modulators(FVM) for independent control of multiplecavities driven by a single klystron. The beamline includes an RFQ and six cavities. The LLRF system providesa primary feedback loop around the RFQ and the distribution of the regulated klystron output is controlledby secondary learning feed-forward loops on the FVMs for each of the six cavities. The feed-forward loopsprovide pulse to pulse correction to the current waveform profiles of the FVM power supplies to compensatefor beam-loading and other disturbances. The learning feed-forward loops are shown to successfully controlthe amplitude and phase settings for the cavities well within the 1 % and 1 degree requirements specified forthe system.

THPB016 Concept: Low Energy, Low Intensity NF from ProjectX – M. Popovic (Fermilab)This note describes the concept of a Low Luminosity Low Energy Neutrino Factory (L3ENF) using a Project Xpulsed, or CW, Linac at 8GeV. By collecting pis and mus with energy ∼1 GeV, and accelerating them to 10 GeV,it is possible to store ∼1020 mus per year. Most of the concepts suggested here can be tested using the Boosterbeam, Recycler, Antiproton Target Station, the Main Injector and the Tevatron. Once the VLENF Muon StorageRing is built, components needed for L3ENF could be used in experiments before Project X completion.

THPB017 A Concept: 8GeV CW Linac, Staged Approach – M. Popovic (Fermilab)This note describes a concept of CW Proton Linac on the Fermilab site. With exception of RFQ the linac isbased on superconducting technology. Based on the output, energy is segmented in three parts, 1GeV, 3GeVand 8GeV. It is located near existing Fermilab Proton Source with the intention that each section of the linaccan be used as soon as it is commissioned. The whole design is based on the designs suggested for the ProtonDriver and ProjectX. The suggested site and linac segmentation allows for the construction to start immedi-ately. Additional benefits come from the fact that the present linac (the oldest machine in Fermilab complex)is replaced and existing Proton Source’s functionality is preserved for the future.

THPB018 Project X and its Physics Program – V.A. Lebedev (Fermilab)Project X is considered to be a cornerstone of Fermilab’s future scientific program in the high energy physicsintensity frontier. There is considerable freedom in staging of the project and choice of its parameters. Thepaper discusses possible high energy physics experiments and their effect on the accelerator and acceleratorpart of the experiments.


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THPB019 Progress with PXIE MEBT Chopper – V.A. Lebedev (Fermilab), A.Z. Chen, R.J. Pasquinelli, D.W. Peterson,A.V. Shemyakin, D. Sun (Fermilab)A capability to provide a large variety of bunch patterns is crucial for the concept of the Project X serving MW-range beam to several experiments simultaneously. This capability will be realized by the Medium EnergyBeam Transport’s (MEBT) chopping system that will divert 80% of all bunches of the initially 5mA, 2.1 MeVCW 162.5 MHz beam to an absorber according to a pre-programmed bunch-by-bunch selection. Being con-sidered one of the most challenging components, the chopping system will be tested at the Project X InjectorExperiment (PXIE) facility that will be built at Fermilab as a prototype of the Project X front end. The bunchdeflection will be made by two identical sets of travelling-wave kickers working in sync. The paper describeselectromagnetic design and tests for one of two versions of the kickers which are being investigated: a planar50Ω structure fed by a linear ±250 V amplifier.

THPB020 Annular-ring Coupled Structure for the Energy Upgrade of the J-PARC Linac – H. Ao (JAEA/J-PARC), H. Asano,N. Ouchi, J. Tamura (JAEA/J-PARC) F. Naito, K. Takata (KEK)The linac of Japan Proton Accelerator Research Complex (J-PARC), which is an injector to the synchrotron,comprises a 3-MeV RFQ, 50-MeV DTLs and the 181-MeV Separated-type DTLs. In order to increase the beampower of the synchrotron, the task of the 400-MeV energy upgrade of the linac started from March 2009. Thetanks of the Annular-ring Coupled Structure (ACS) linac, RF sources, beam monitors and utilities are in pro-duction. Although some peripheral components of the ACS linac are prepared previously, the all ACS tankswill be installed and conditioned for 4 months from July 2013. Beam commissioning of the 400-MeV linac isscheduled to begin in October and expected to finish at the end of November 2013. In this paper, we presentthe current status of the energy upgrade and some R&D results for new equipment for ACS linac.

THPB021 Recovery Efforts from the Tohoku Earthquake and Energy Upgrade Preparation of the Beam Transport fromthe J-PARC Linac to the 3-GeV Synchrotron – J. Tamura (JAEA/J-PARC)In 2013, the beam energy of the Japan Proton Accelerator Research Complex (J-PARC) linac is going to beincreased from 181-MeV to 400-MeV by adding the annular-ring coupled structure (ACS) at the downstreamof the 191-MeV drift tube linac. To install and operate all the ACS cavities in only five months of the energyupgrade shutdown in 2013, we decided to replace and upgrade all the related component of the beam line(cables, magnet power supplies and vacuum control systems) for the 400-MeV operation, in the period of therecovery from the Tohoku Earthquake which caused not negligible damage to the J-PARC accelerator facilities.The present beam line is operated by using some part of the 400-MeV componets. In this paper, the recoveryof the beam transport, the present status and the future tasks of the beam energy upgrade will be presented.

THPB022 Beam Phase Measurement for PEFP Linear Accelerator – H.S. Kim (KAERI), Y.-S. Cho, J.-H. Jang, H.-J. Kwon,J.Y. Ryu, K.T. Seol, Y.-G. Song (KAERI)According to the commissioning plan of the PEFP proton linac, an accurate measurement of beam phase is es-sential, especially for setting up the RF operating parameters of DTL. Beam position monitors (BPMs) installedbetween DTL tanks can provide information about the beam phase as well as about the beam transverse po-sition. By using a BPM as a beam phase monitor, beam phase can be measured without additional deviceson the linac or the beam line. The signals from 4 electrodes in the BPM can be summed by using a 4-way RFcombiner, by which the effect of the transverse beam offset on the phase measurement can be eliminated. Thecombined BPM signal (350 MHz) is mixed with LO signal (300 MHz) and down-converted to IF signal (50 MHz),then fed into the signal processing unit, where the phase information is extracted by using IQ demodulationmethod with a sampling frequency of 40 MHz. In this paper, the beam phase measurement system and signalprocessing scheme will be presented.

THPB023 Linac Construction for China Spallation Neutron Source – S. Fu (IHEP), J. Li, H.C. Liu, H.F. Ouyang, X. Yin(IHEP)Construction of China Spallation Neutron Source(CSNS) has been launched in September 2011. CSNS accel-erator will provide 100kW proton beam on a target at beam energy of 1.6GeV. It consists of an 80MeV H- linacand 1.6GeV rapid cycling synchrotron. Based on the prototyping experience, CSNS linac, including the frontend and four DTL tanks, has finalized the design and started procurement. In this paper, we will first presentan outline of the CSNS accelerator in its design and construction plan. Then the major prototyping results ofthe linac will be presented. Finally the linac construction progress in recent will be updated.

THPB024 Main Linac Physics Design Study of the C-ADS Project – F. Yan (IHEP), Z. Li, C. Meng, J.Y. Tang (IHEP)The Chinese ADS project is proposed to build a 1000MW Accelerator Driven sub-critical System before 2032.The accelerator will be operating on CW mode with 10mA average current and the final energy is 1.5GeV. Thewhole linac are composed of two major sections: the Injector section and the main linac section. There aretwo different schemes for the Injector section. InjectorI is basing on 325MHz RFQ and superconducting spokecavities and Injector II is basing on 162.5MHz RFQ and superconducting HWR cavities. The main linac designwill be different for different Injector choice. If Injector II scheme is adopted, the main linac bunch current willbe doubled. In this paper we studied the main linac design basing on InjectorII scheme. The design principlesand the priliminary design results is presented.

THPB025 325MHz CW Room Temperature High Power Bunching Cavity for the ADS MEBT1 – S. Pei (IHEP), Y.L. Chi,H. Geng, X. Li, Z. Li, H.F. Ouyang, J.Y. Tang, J.R. Zhang (IHEP)


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The ADS pilot project based on the proton linac is being developed at IHEP, Beijing, China. Two room temper-ature high power bunching cavities are requied to match the longitudinal phase space from RFQ to the down-stream superconducting linacs. In this paper, the RF and machanical designs of the double re-entrant bunch-ing cavities are described. In the meantime, the RF-thermal-structural-RF coupled analysis on the bunchingcavities has been done, cooling scheme is optimized, the atmospheric pressure effect on the cavity frequencyshift is simulated.

THPB026 The Beam Commissioning Plan of Injector II in C-ADS – Z.J. Wang (IMP), Y. He, H. Jia, C. Li, S.H. Liu (IMP)The design work of the Injector II, which is 10 MeV proton linac, in C-ADS project is being finished and somekey elements are being fabricated. Now it is necessary to definite the operation mode of beam commissioning,including the selection of the beam current, pulse length and repetition frequency. Also the beam commis-sions plan should be specified. The beam commissions procedures is simulated with t-mode code GPT. In thispaper, the general beam commissioning plan of Injector II in CIADS and simulation results of commissionsprocedures are presented.

THPB027 Progress of one of the 10 MeV Injectors for C-ADS – Y. He (IMP), Z.J. Wang, J.X. Wu, Z. Xu, B. Zhang, S.H. Zhang,H.W. Zhao (IMP) D. Li (LBNL)A 10 MeV superconducting proton linac is being design and constructing at Institute of Modern Physics (IMP)of Chinese Academy of Sciences (CAS). This proton linac is one of two injectors for Chinese ADS project. It isto validate one of concepts for C-ADS front end, to demonstrate the low beta acceleration, to minimize the riskof key technoledges within the Reference Design. It consists of a 2.1 MeV RFQ and two cryomodules hosting 8HWR cavities. The basic frequecy is 162.5 MHz. The physical design of linac and the progess of prototypes forsolid state amplifiers, superconducting solenoids, supercondecting HWRs, ion source, and RFQ are presentedin the paper.

THPB028 The ESS Low Energy Beam Transport Line Design – A. Ponton (ESS) L. Neri (INFN/LNS)The ESS LInear ACcelerator (linac) will produce high intensity, 50 mA, and high duty cycle, 4 %, proton beam at2.5 GeV. From the ion source to the entrance of the Radio-Frequency Quadrupole (RFQ) is a dual solenoid LEBTincluded an electrostatic chopper. The paper will present the the results of the beam transport simulation ofthe LEBT including a modelization of the ion source extraction system. The Space Charge Compensation (SCC)effect due to the ionization of the residual gas by the main beam will also be described according to theoreticaland experimental assumptions. Beam dynamics of the chopping scheme dedicated to remove the unwantedbeam part due to source transients will also be evaluated.

THPB029 The ESS RFQ Beam Dynamics Design – A. Ponton (ESS)to be added

THPB030 DTL Design for ESS Accelerator – M. Comunian (INFN/LNL), F. Grespan, A. Pisent (INFN/LNL) R. De Prisco(Lund University)In the present design of the European Spallation Source (ESS) accelerator, the Drift Tube Linac (DTL) will ac-celerate a proton beam of 50 mA pulse peak current from 3 to 80 MeV. It is designed to operate at 352.2 MHz,with a duty cycle of 4% (3 ms pulse length, 14 Hz repetition period). Permanent magnet quadrupoles (PMQs)are used as focusing elements in a FODO lattice scheme, which leaves space for steerers and diagnostics . Inthis paper beam dynamics studies and preliminary RF design are shown, including constraints in terms ofquadrupole dimensions, total length, field stability, RF power, peak electric field.

THPB031 Status Report on the French High-intensity Proton Injector Project at SACLAY (IPHI) – B. Pottin (CEA/DSM/IRFU), M. Desmons, A. France, R. Gobin, O. Piquet (CEA/DSM/IRFU)The construction of IPHI (High Power Proton Accelerator) is in its final step of installation. The high intensitylight ion source (SILHI) has been built first to produce regularly CW high intensity (over 100 mA) proton beams.The low energy front end of IPHI is based on a 352 MHz, 6 m long Radiofrequency Quadrupole (RFQ) cavity.The RFQ will accelerate beam up to 100 mA with energy up to 3 MeV. A diagnostics line has been designed tomeasure all the main characteristics of the beam at the RFQ output. In this paper we will present the status forthe main components of the injector, in particularly the RFQ fabrication and the RF power facilities.

THPB032 Beam Dynamics Studies for a Proposed 800 MeV ISIS Upgrade Linac – D.C. Plostinar (STFC/RAL/ASTeC),C.R. Prior, G.H. Rees (STFC/RAL/ASTeC)Several schemes have been proposed to upgrade the ISIS Spallation Neutron Source at Rutherford AppletonLaboratory (RAL). One scenario is to develop a new 800 MeV, H- linac and a ∼3 GeV synchrotron, opening thepossibility of achieving several MW of beam power. In this paper the overall beam dynamics design of the 800MeV linac is presented.

THPB033 Approach of a Failure Analysis for the MYRRHA Linac – J.-P. Carneiro (Fermilab) J.-L. Biarrotte (IPN) D. Uriot(CEA/DSM/IRFU) D. Vandeplassche (SCK•CEN)The MYRRHA project currently under development at SCK•CEN (Mol, Belgium) is a subcritical research reac-tor that requires a 600 MeV proton accelerator as a driver. This linac is expected to produce a beam power of1.5 MW onto a spallation target for the reactor to deliver a thermal power around 70 MW. Thermomechanicalconsiderations of the spallation target set stringent requirements on the beam trip rate which should not ex-ceed 40 trips/year for interruptions greater than 3 seconds. This paper presents a first approach of developinga method that would allow to rematch the beam online in the MYRRHA linac upon the the failure of acceleratorcomponents.


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THPB034 Status of the FAIR 70 MeV Proton Linac – L. Groening (GSI), W.A. Barth, R. Berezov, G. Clemente, P. Forck,R. Hollinger, R. Huhmann, P. Kowina, A. Krämer, C. Mühle, J. Pfister, G. Schreiber, J. Trueller, W. Vinzenz (GSI)B. Koubek, A. Schempp (IAP)To provide the primary proton beam for the FAIR anti-proton research program, a 70 MeV, 70 mA linac iscurrently under design & construction at GSI. The nc machine comprises an ECR source, a 3 MeV RFQ, and aDTL based on CH-cavities. Up to 36 MeV pairs of rf-coupled cavities (CCH) are used. A prototype cavity hasbeen built and is prepared for high power rf-testing. An overview of the status as well as on the perspectives ofthe project is given.

THPB035 Experience with a 4-Rod CW Radio Frequency Quadrupole – P. Gerhard (GSI), W.A. Barth, L.A. Dahl, W. Hart-mann, G. Schreiber, W. Vinzenz, H. Vormann (GSI)Since 1991 the High Charge State Injector (HLI) provides heavy ion beams for the linear accelerator UNILAC atGSI*. It is equipped with an ECR ion source and an RFQ-IH linac which accelerates highly charged ion beamswith high duty factor of up to 30% to 1.4 MeV/u for further acceleration in the Alvarez DTL of the UNILAC.Main user of these beams is the Super Heavy Element (SHE) research, one of the outstanding projects at GSI**.Experiments like TASCA and SHIP strongly benefit from the high average beam intensities. After two decadesof successful operation the four-rod Radio Frequency Quadrupole (RFQ) accelerator was replaced in 2010 bya newly designed RFQ of the same type**. Besides higher beam transmission, the principal intention of thisupgrade was to raise the duty factor up to 100%, since the HLI is foreseen as injector for the upcoming cw linacdedicated to the SHE program**. Commissioning and operational experience from the first years revealedthat this goal could not be reached easily. In this paper we present the RFQ design, commissioning results,operational experience and future activities.

THPB036 The New Option for a Front End of Ion Linac – A.D. Kovalenko (JINR) A. Kolomiets (ITEP)The standard ion linac front-end consisting of RFQ, two tanks of accelerating IH-structures, MEBTs withmatching and focusing elements is modified to achieve better performances. Special vane section that pro-vides the same beam transformation as debuncher and quadrupole triplet is added within the RFQ tank,whereas superconducting focusing elements, solenoids, for example, are used between the IH - structure tanks.Test frond end was designed to provide the output beam energy up to 4 MeV/u for the particles with charge-to-mass ratio of 0.16 < q/m ≤ 1. Results of beam dynamics simulation are presented. Possible application ofthe considered scheme for the NICA facility at JINR (Dubna, Russia) is discussed.

THPB037 Iron Beam Acceleration with DPIS – M. Okamura (BNL) T. Kanesue (IAP) K. Kondo, M. Sekine (RLNR) K. Taka-hashi (Department of Energy Sciences, Tokyo Institute of Technology) T. Yamamoto (RISE)It has been proved that direct plasma Injection Scheme (DPIS) is an efficient way to accelerate high currenthighly charged state heavy ion beam. More than 50 mA (peak current) of various heavy ion beams can be eas-ily accelerated. However, it was rather difficult to obtain longer pulse especially for highly charged particles.To induce highly charged states ions, a high plasma temperature is required at the laser irradiation point andthe high temperature automatically gives a very fast expansion velocity of the plasma. This shortens the ionbeam pulse length. To compensate the shorter ion pulse length, we can extend the plasma drift length, but itwill dilute the brightness of the plasma since the plasma expands three dimensionally. To avoid the reductionof the brightness, a simple long solenoid was applied to confine the diverging angle of the plasma expansion.In the conference, this new technique will be explained and the latest results of iron beam acceleration will beshown.

THPB038 Assembly and RF Tuning of the Linac4 RFQ at CERN – C. Rossi (CERN), A. Dallocchio, J. Hansen, J.-B. Lalle-ment, A.M. Lombardi, S.J. Mathot, D. Pugnat, M.A. Timmins, G. Vandoni, M. Vretenar (CERN) M. Desmons,A. France, Y. Le Noa, J. Novo, O. Piquet (CEA/DSM/IRFU)The fabrication of Linac4 is progressing at CERN with the goal of making a 160 MeV H- beam available to theLHC injection chain as from 2015. In the Linac4 the first stage of beam acceleration, after its extraction fromthe ion source, is provided by a Radiofrequency Quadrupole accelerator (RFQ), operating at the RF frequencyof 352.2 MHz and which accelerates the ion beam to the energy of 3 MeV. The RFQ, made of three modules,one meter each, is of the four-vane kind, has been designed in the frame of a collaboration between CERN andCEA and has been completely machined and assembled at CERN. The paper describes the assembly of the RFQstructure and reports the results of RF low power measurements, in order to achieve the required acceleratingfield flatness within 1% of the nominal field profile.

THPB039 Design of a Four-vane RFQ for China ADS Project – Z.L. Zhang (IMP), X. Du, Y. He, X. Jin, Y. Liu, G. Pan, A. Shi,L.P. Sun, B. Zhang, H.W. Zhao (IMP)A four-vane RFQ accelerator has been designed for the ADS project which has been launched in China since2011. As one of the front ends of C-ADS LINAC, the RFQ works at a frequency of 162.5 MHz, accelerating theproton beam from 35 keV to 2.1 MeV. Due to the CW (continuous wave) operating mode, a small Kilpatricfactor of 1.2 was adopted. At the same time, Pi-mode rods are employed to reduce the effect of dipole mode onquadrupole mode, and cavity tuning will be implemented by temperature adjustment of cooling water. Beamdynamics design, RF cavity design, thermal and stress analysis all will be presented in the paper.

THPB040 High-Power RF Conditioning of the TRASCO RFQ – E. Fagotti (INFN/LNL), L. Antoniazzi, F. Grespan, A. Pal-mieri (INFN/LNL) M. Desmons (CEA/DSM/IRFU)The TRASCO RFQ is designed to accelerate a 40 mA proton beam up to 5 MeV. It is a CW machine which has toshow stable operation and provide the requested availability. It is composed of three electromagnetic segment


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coupled via two coupling cells. Each segment is divided into two 1.2 m long OFE copper modules. The RFQ isfed through eight loop-based power couplers to deliver RF to the cavity from a 352.2 MHZ, 1.3 MW klystron.After couplers conditioning, the first electromagnetic segment was successfully tested at full power. RFQ cavityreached the nominal 68 kV inter-vane voltage (1.8 Kilp.) in CW operation. Moreover, during conditioning inpulsed operation, it was possible to reach 83 kV inter-vane voltage (2.2 Kilp.) with a 1% duty cycle. The de-scription of the experimental setup and procedure, as well as the main results of the conditioning procedurewill be reported in this paper.

THPB041 Bridge End-cell for CW 4-vane RFQs – A. Pisent (INFN/LNL), F. Grespan, A. Palmieri (INFN/LNL)The end cells represent very critical points of a four vanes RFQ operating in cw mode. Indeed in correspon-dence with the vanes undercut the hottest spot are generally found, with intense surface currents that have tocross one or two (bolted electrodes case) RF contacts. A novel mechanical solution to mitigate this problem ishere presented.

THPB042 Production and Quality Control of the First Modules of the IFMIF-EVEDA RFQ – F. Scantamburlo (INFN-Sez. di Padova), R. Dima, A. Pepato (INFN- Sez. di Padova)The IFMIF-EVEDA RFQ, designed to accelerate a 125 mA D+ beam from the initial energy of 0.1 MeV to thefinal energy of 5 MeV at the frequency of 175 MHz, consists of 18 mechanical modules whose length is approx-imately 54 cm each. The production of the modules has started and, in particular, the modules 16, 17, 15 and11, plus the prototype modules 1 and 2 have undergone all the production steps, including precision millingand brazing. In this article, the progress of the production, and the quality control during the phases of theproduction of the modules will be described.

THPB043 The RFQ injector for the Radioactive Ion Beam of SPES Project – M. Comunian (INFN/LNL), F. Grespan, A. Pal-mieri, A. Pisent (INFN/LNL)A Continous Wave Radio Frequency Quadrupole Accelerator has been designed for the Radioactive Ion Beamof SPES Project to be used as an Injector of the ALPI Linac. The RFQ frequency is 80 MHz for an input energy of40 keV, with output energy of 5 MeV and ion ratio q/A<= 1/7. Particular care has been put in the design phaseto include an internal bunching section able to reduce the longitudinal output emittance. The details of theRF study of such a cavity are included as well.

THPB044 Plans for an Integrated Front-End Test Stand at the Spallation Neutron Source – M.S. Champion (ORNL),A.V. Aleksandrov (ORNL)A spare Radio-Frequency Quadrupole (RFQ) is presently being fabricated by industry with delivery to OakRidge National Laboratory planned in early autumn 2012. The establishment of a test stand at the SpallationNeutron Source site is underway so that complete acceptance testing can be performed during the winter of2012-2013. This activity is the first step in the establishment of an integrated front-end test stand that willinclude an ion source, low-energy beam transport (LEBT), RFQ, medium-energy beam transport, diagnostics,and a beam dump. The test stand will be capable of delivering an H- ion beam of up to 50 mA with a pulselength of 1 ms and a repetition rate of 60 Hz or a proton beam of up to 50 mA, 100 µs, 1 Hz. The test standwill enable the following activities: complete ion source characterization; development of a magnetic LEBTchopper; development of a two-source layout; development of beam diagnostics; and study of beam dynamicsof high intensity beam.

THPB045 The RF and LLRF System of 60.625 MHz CW RFQ for ATLAS Efficiency and Intensity Upgrade – S.I. Shara-mentov (ANL)A new RFQ accelerator will allow delivering 250 keV/u ion beams with q/A ≥1/7. The RFQ RF system has two60 kW CW vacuum tube amplifier allowing for 120 kW total rf power into resonator. The RFQ has two highpower couplers, one for each amplifier. The LLRF control system design allows flexible system operation whena single amplifier or both amplifiers drive the cavity. The LLRF also allows for a driven or self-excited modeof operation which is beneficial during initial RFQ warming-up with rf power. The paper describes the detailsand characteristics of RF and LLRF RFQ systems.

THPB046 RF Setup of the MedAustron RFQ – B. Koubek (IAP), A. Schempp, J.S. Schmidt (IAP)A Radio Frequency Quadrupole (RFQ) was built for the injector of the cancer treatment facility MedAuston inAustria. The 216 MHz RFQ accelerates protons and carbon ions up to 400 keV with an electrode length of 1.25m. For the RF design simulations were performed using CST Microwave Studio. The simulations and the RFsetup of the delivered RFQ are presented in this paper.

THPB047 Test-RFQ for the MAX Project – M. Vossberg (IAP), H. Klein, H. Podlech, A. Schempp (IAP) A. Bechtold (NTGNeue Technologien GmbH & Co KG)As a part of the MAX project it will be demonstrated by simulations and thermal measurements, that a 4-rod-RFQ is the right choice even at cw-operation. A 4-rod Test-RFQ with a resonance frequency of 175 MHz hasbeen designed and built for the MAX-Project. But the RFQ had to be modified to solve the cooling problem atcw-operation, the geometrical precision had to be improved as well as the rf-contacts. The developments led toa new layout and a sophisticated production procedure of the stems and the electrodes. Calculations show animproved Rp-value leading to powerlosses of ca. 25 kW/m only, which is about half of the powerlosses whichcould be achieved safely at cw-operation of the similar Saraf-RFQ. Thermal measurements and simulationswith the single components are in progress. The temperature distribution in cw-operation will be measuredand the rf-performance checked.


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THPB048 The Tuning Process for 4-Rod RFQs – A. Schempp (IAP), B. Koubek, J.S. Schmidt (IAP)For the optimization of RFQ design parameters, a certain voltage distribution along the electrodes is asumed.Therefore an accurate tuning of the voltage distribution is important for the beam dynamical properties of aRFQ. A variation can lead to particel losses with reduced beam quality and a higher power consumption exspe-cially with sensitive structures in the high frequency region. A LabVIEW based software has been developed tostructure the tuning process of 4-rod Radio Radio Frequency Quadrupols (RFQs). In this paper the results ofthis simulations are compared to other methods and measurement data of 4-rod RFQs from 80 to 200 MHz

THPB049 Tuning Studies on 4-rod-RFQs – J.S. Schmidt (IAP), B. Koubek, A. Schempp (IAP)A NI LabVIEW based Tuning Software has been developed to structure the tuning process of 4-rod-Radio Fre-quency Quadrupole s (RFQs) and its results are compared to measurement data of 4-rod-RFQs in differentfrequency ranges. For the optimization of RFQ design parameters, a certain voltage distribution along theelectrodes of an RFQ is assumed. Therefore an accurate tuning of the voltage distribution is very importantfor the beam dynamic properties of an RFQ. A variation can lead to particle losses and reduced beam qualityespecially with higher frequencies. Our electrode design usually implies a constant longitudinal voltage dis-tribution. For its adjustment tuning plates are used between the stems of the 4-rod-RFQ. These predictionsare based, in contrast to other simulations, on measurements, to define the characteristics of the RFQ as it wasbuild - not depending on assumptions of the design. This will lead to a totally new structured process of tuning4-rod-RFQs in a broad range of frequencies by using the predictions of a software. The results of these studiesare presented in this paper.

THPB050 RFQ With Improved Energy Gain – A. Kolomiets (ITEP) A.S. Plastun (MEPhI)RFQ structure is practically only one choice for using in front ends of ion linacs for acceleration up to energyabout 3 MeV. This limit is due to its relatively low acceleration efficiency. However it isn’t intrinsic feature ofRFQ principle. It is defined only by vane geometry of conventional RFQ structure with sinusoidal modulationof vanes. The paper presents results of analysis RFQ with modified vane geometries that allow to improveacceleration efficiency. RFQ with modified vanes was used for design second section of heavy ion injector ofTWAC for acceleration of ions with Z/A = 0.33 up to 7 MeV/u.

THPB051 Changes in the Low and Medium Energy Beam Transport at the BNL 200 MeV Linac – D. Raparia (BNL)After reconfiguration of the low energy (35 keV) and the medium energy (750 keV) transport lines in 2009-10,the Brookhaven linac delivered the highest intensity beam since it was built in 1970 (∼120 µA average currentof H- to the Brookhaven Linac Isotope Producer). It also delivered lower emittance polarized H- ion beam forthe polarized program at RHIC. To increase the intensity further, the match into the RFQ was improved byreducing the distance from the fnal focusing solenoid to the RFQ and replacing the buncher in the 750 keVline with one with higher Q value, to allow operation at higher power. We also found that drift –tube linac tanknumber 7 was operating with about 1 MW lower power than design. The transmission efficiencies and beamquality will be discussed in the paper.

THPB052 Recent Progress with the J-PARC RFQs – Y. Kondo (JAEA/J-PARC), K. Hasegawa, T. Morishita (JAEA/J-PARC)H. Kawamata, F. Naito, T. Sugimura (KEK)In this paper, we will report recent topics about J-PARC RFQs. First, the operating RFQ (RFQ I) have been recov-ered from the long shutdown due to the earthquake. This RFQ have been suffered from breakdown problemsince 2008, therefore we have been developing a back-up RFQ (RFQ II). In April 2012, the high power test wassuccessfully performed. Finally, we are fabricating a new RFQ for the beam-current upgrade of the J-PARClinac (RFQ III). The status of these RFQs are described.

THPB053 Design of a 200 MHz RFQ for 3 MeV He Beam – Y.-S. Cho (KAERI), J.-H. Jang, D.I. Kim, H.S. Kim, H.-J. Kwon,K.T. Seol (KAERI)To produce more efficient power semiconductors by reducing the switch loss, helium ion implantation hasbeen studied instead of gold diffusion and electron irradiation methods. 3 MeV energy and 1 mA current forabout 1010 ions/cm2 dose on silicon wafers of ten inches in diameter are required. A RFQ can be a good ac-celerator to meet the above requirements. We have designed a four-vane type 200 MHz RFQ for the purpose.A 20keV/u He++ beam of 20 mA peak current is extracted from an ion source and matched to the RFQ withelectrostatic lenses. The RFQ is designed to accelerate He ions (A/q=2) up to 750 keV/u. A 200 kW tetrode RFamplifier drives the RFQ with the duty factor of 5%. After the RFQ, a beam wobbling system and a beam trans-port system are required to irradiated the beam on large silicone wafers. The detail design will be presented atthe conference.

THPB054 EM Design Features of CW RFQ for the Project X Injector Facility – G.V. Romanov (Fermilab) M.D. Hoff, D. Li,J.W. Staples, S.P. Virostek (LBNL)The Project X Injector Experiment (PXIE) will be a prototype front end of the Project X accelerator proposedby Fermilab. PXIE will consist of an H- ion source, a low-energy beam transport (LEBT), a radio-frequencyquadrupole (RFQ) accelerator, a medium-energy beam transport (MEBT) and a section of superconducting.The four-vane 4.45 m long CW RFQ with a resonant frequency at 162.5 MHz (2.4 wavelengths long) will providebunching and acceleration of a nominal 5 mA H- beam from 30 keV to 2.1 MeV. The RFQ design providesrelatively low wall power losses that are less than 100 kW. Nevertheless CW operation has required specialconsideration of some RFQ details. An electromagnetic RFQ design and a summary of various analyses arepresented here.


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THPB055 Numerical Simulations of ProjectX/PXIE RFQ – J.-F. Ostiguy (Fermilab), G.V. Romanov, N. Solyak (Fermilab)Project-X is a proposed superconducting linac-based high intensity proton source at Fermilab. The machinefirst stages operate in CW mode from 2.1 to 3 GeV and a high bandwidth chopper is used to produce the re-quired bunch patterns. A 162.5 MHz CW RFQ accelerates the beam from 30 keV to 2.1 MeV. A concern with CWoperation is that losses either within the RFQ or in the dowstream modules should be well-understood andremain very low to ensure safe and/or reliable operation. In this contribution, we investigate the suitabilityof existing RFQ codes and model the PXIE RFQ (ProjectX test facility) designed constructed by LBNL to makeuseful predictions of loss patterns and phase space distribution.

04 Extreme Beams, Sources and Other TechnologiesTHPB057 MICE Step I: First Measurement of Emittance with Particle Physics Detectors – V.C. Palladino (INFN-Napoli)

The muon ionization cooling experiment (MICE) is a strategic R&D project intending to demonstrate the onlypractical solution to prepare high brilliance beams necessary for a neutrino factory or muon colliders. MICEis under development at the Rutherford Appleton Laboratory (UK). It comprises a dedicated beam line to gen-erate a range of input emittance and momentum, with time-of-flight and Cherenkov detectors to ensure apure muon beam. The emittance of the incoming beam is measured in the upstream magnetic spectrometerwith a sci-fiber tracker. A cooling cell will then follow, alternating energy loss in Li-H absorbers and RF accel-eration. A second spectrometer identical to the first and a second muon identification system measure theoutgoing emittance. In the 2010-11 run the beam and most detectors have been fully commissioned and a firstmeasurement of the emittance of a beam with particle physics (time-of-flight) detectors has been performed.The analysis of these data is now completed. The next steps of more precise measurements, of emittance andemittance reduction (cooling), that will follow in 2012 and later, will also be outlined.

THPB058 Progress in the Construction of the Muon Ionisation Cooling Experiment (MICE) Channel – V.C. Palladino(INFN-Napoli)MICE, sited at RAL in the UK, aims to build and test 1 cell of a realistic ionization cooling channel lattice. Thiscomprises 3 Absorber-Focus-Coil (AFC) and 2 RF-Coupling-Coil (RFCC) modules. Both modules are techni-cally challenging. The FC are dual-coil superconducting solenoids, in close proximity, wound on a commonmandrel. Each pair of coils is run in series, but can be configured with the coil polarities in the same (solenoidmode) or opposite (gradient mode). At the center of each FC there is a 20L Li-H absorber, operating at about14 K, the energy loss medium for the cooling process. The longitudinal beam momentum is restored in theRFCC modules, each housing four 201.25 MHz RF cavities whose irises are closed with 42 cm diameter thinBe windows. To contain the muon beam, each RFCC module also has a 1.4 m diameter superconducting cou-pling solenoid surrounding the cavities. Both types of magnet are cooled with multiple 2-stage cryo-coolers,each delivering 1.5 W of cooling at 4 K. Designs for all components are complete and fabrication is under way.Descriptions of the various components, design requirements, and construction status will be described.

THPB059 Progress of MICE, the International Muon Ionization Cooling Experiment – D. Rajaram (Illinois Institute ofTechnology)Ionization Cooling is the only practical solution to preparing high brilliance muon beams for a neutrino factoryor muon collider. The muon ionization cooling experiment (MICE) is under development at the RutherfordAppleton Laboratory (UK) by an international collaboration. The muon beam line has been commissionedand, for the first time, measurements of beam emittance with particle physics detectors have been performed.The remaining apparatus is currently under construction. First results with a liquid-hydrogen absorber willbe produced in 2013; a couple of years later a full cell of a representative ionization cooling channel, includ-ing RF re-acceleration, will be in operation. The design offers opportunities to observe cooling with variousabsorbers and several optics configurations. Results will be compared with detailed simulations of coolingchannel performance to ensure full understanding of the cooling process.

THPB061 Experimental and Simulation Study of the Long-path-length Dynamics of a Space-charge-dominatedBunch – I. Haber (UMD), B.L. Beaudoin, S. Bernal, R.A. Kishek, T.W. Koeth (UMD)The University of Maryland Electron Ring (UMER) is a low-energy (10 keV) electron facility built to study, ona scaled machine, the long-propagation-length evolution of a space-charge-dominated beam. Though con-structed in a ring geometry to achieve a long path length at modest cost, UMER has observed important space-charge physics directly relevant to linear machines. Examples will be presented that emphasize studies of thelongitudinal dynamics and comparisons to axisymmetric simulations. The detailed agreement obtained be-tween simulation and experiment will be presented as evidence that the longitudinal physics observed is notstrongly influenced by the ring geometry. Novel phenomena such as soliton formation, unimpeded bunch-endinterpenetration, and an instability that occurs after this interpenetration, will be discussed.

THPB062 Multipole Field Effects for the Superconducting Parallel-bar Deflecting/Crabbing Cavities – S.U. De Silva(ODU), J.R. Delayen (ODU) S.U. De SilvaThe superconducting parallel-bar deflecting/crabbing cavity is currently being considered as one of the designoptions in rf separation for the Jefferson Lab 12 GeV upgrade and for the crabbing cavity for the proposed LHCluminosity upgrade. Knowledge of multipole field effects is important for accurate beam dynamics study of rfstructures. The multipole components can be accurately determined numerically using the electromagneticsurface field data in the rf structure. This paper discusses the detailed analysis of those components for thefundamental deflecting/crabbing mode and higher order modes in the parallel-bar deflecting/crabbing cavity.


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THPB063 Simulated Performance of the CARIBU EBIS Charge-breeder Transport Line – C. Dickerson (ANL), S.A. Kon-drashev, B. Mustapha, P.N. Ostroumov (ANL) A.I. Pikin (BNL)An Electron Beam Ion Source (EBIS) is being built to charge breed ion beams from the Californium Rare Iso-tope Breeder Upgrade (CARIBU) for acceleration in the Argonne Tandem Linear Accelerator System (ATLAS)at Argonne National Laboratory (ANL). The calculated acceptance of the EBIS charge breeder can approachthe emittance of the injected ion beam, so beam distortion during the ion beam transport could lead to in-complete injection and overall efficiency losses. The beam quality can be maintained for simulations of thetransport line design using the ideal ion beam parameters. Investigations into the acceptable limits of ionbeam misalignment and quality throughout the transport line will be reported.

THPB064 Beam Dynamics Tools for Linac Design – A.S. Setty (THALES)In the last 25 years, we have been using our in house 3D code PRODYN * for electron beam simulations. Wehave also been using our in house code SECTION for the design of the travelling wave accelerating structuresand the beam loading compensation. PRODYN follows in time, the most complicated electron trajectorieswith relativistic space-charge effects. This code includes backward as well as forwards movements. This paperwill describe those two codes and will give some simulations and measurements results.

02 Proton and Ion Accelerators and ApplicationsTHPB065 Status of the Beam Dynamics Code DYNAC – E. Tanke (FRIB), W. Wittmer, X. Wu (FRIB) D. Wang (NSCL)

The beam dynamics code DYNAC* was originally developed at CERN. For accelerating elements a set of veryaccurate quasi-Liouvillian beam dynamics equations was introduced, applicable to protons, heavy ions andnon-relativistic electrons. Furthermore, DYNAC contains three space charge routines, including a 3D ver-sion**. More recently, a numerical method has been added, capable of simulating a multi charge state ionbeam in accelerating elements (i.e. cavities). Beam line devices such as sextupoles and quadrupole-sextupolemagnets as well as electrostatic devices are now also included. Capability of second order calculations of suchelements for a multi charge state beam has been implemented. Benchmarking of the code, in particular for amulti-charge state beam is discussed. Comparison of beam simulations results with beam measurements onthe MSU ReAccelerator (ReA) are reported. The possibility of using DYNAC as an online tool for ReA and FRIBis discussed.

04 Extreme Beams, Sources and Other TechnologiesTHPB066 Photoinjector SRF Cavity Development for BERL inPro – A. Neumann (HZB), W. Anders, T. Kamps, J. Knobloch

(HZB) E.N. Zaplatin (FZJ)In 2010 HZB has received approval to build BERL inPro, an ERL project to demonstrate energy recovery at 100mA beam current by pertaining a high quality beam. These goals place stringent requirements on the SRFcavity for the photoinjector which has to deliver a small emittance 100 mA beam with at least 1.5 MeV kineticenergy while limited by fundamental power coupler performance to about 200 kW forward power. In oderto achieve these goals the injector cavity is being developed in a three stage approach. The current designstudies focus on implementing a normal conducting cathode insert into a newly developed superconductingphotoinjector cavity. In this paper the fundamental RF design calculations concerning cell shape for optimizedbeam dynamics as well as SRF performance will be presented. Further studies concentrate on the HZDR basedchoke cell design to implement the high quantum efficiency normal conducting cathode with the SRF cavity.

THPB067 Recent Progress on DC-SRF photocathode injector with a 3.5-cell cavity for PKU-SETF – F. Zhu (PKU/IHIP),J.E. Chen, J.K. Hao, S. Huang, L. Lin, K.X. Liu, S.W. Quan, F. Wang, H.M. Xie, K. Zhao (PKU/IHIP)The DC-SRF photocathode injector developed by Peking University (PKU) is one of the new candidate lowemittance, high brightness electron beam sources. This DC-SRF injector for PKU-SETF (superconducting ERLtest facility) integrates a 100 kV Pierce gun and a 3.5-cell superconducting cavity. The vertical test of the 3.5-cell cavity, made of large grain niobium, has been carried out at the Jefferson Lab and the acceleration gradientreached 23.5 MV/m. The cold RF experiments and the beam loading measurements have been carried outsoon after the installation and commissioning of 2 K cryogenic system. An 81.25 MHz laser system and anew 1.3 GHz 20 kW solid state amplifier are also ready. In this report we will present the new results of beamexperiment of this 3.5-cell DC-SRF photocathode injector.

THPB068 First Observation of Photoemission Enhancement from Copper Cathode Illuminated by Z-polarized LaserPulse – H. Tomizawa (JASRI/SPring-8), H. Dewa, A. Mizuno, T. Taniuchi (JASRI/SPring-8)Since 2006, we have developed a novel photocathode gun gated by laser-induced Schottky-effect. This newtype of gun utilizes a laser’s coherency to aim at a compact femtosecond laser oscillator as an IR laser sourceusing Z-polarization on the photocathode. This Z-polarization scheme reduces the laser photon energy (mak-ing it possible to excite the cathode with a longer wavelength) by reducing the work function of cathode dueto Schottky effect. A hollow laser incidence is applied with a hollow convex lens in a vacuum that is focusedafter passing the laser beam through a radial polarizer. According to our calculations (convex lens: NA=0.15), aZ-field of 1 GV/m needs 1.26 MW at peak power for the fundamental wavelength (792 nm). In the first demon-stration of Z-field emission, enhancement was done with a copper cathode at THG (264 nm). Consequently,we observed 1.4 times enhancement of photoemission at 1.6 GV/m of an averaged laser Z-field on the cathodesurface. We report the first observation and analysis of the emission enhancements with this laser-inducedSchottky-effect on metal copper photocathodes by comparing radial and azimuthal polarizations of the inci-dent laser pulses.


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THPB069 Beam Dynamics Studies for SRF Photoinjectors – T. Kamps (HZB), A. Neumann, J. Völker (HZB) J.K. Sekutow-icz (DESY)The SRF photoinjector combines the advantages of photo-assisted production of high brightness, short elec-tron pulses and high gradient, low-loss continuous wave (CW) operation of a superconducting radiofrequency(SRF) cavity. The paper discusses beam dynamics considerations for FEL and ERL class applications of SRFphotoinjectors. One case of particular interest is the design of the SRF photoinjector for BERL inPro, an ERLtest facility demanding a high brightness beam with an emittance better than 1 mm mrad at 77 pC and averagecurrent of 100 mA.

THPB072 Industrial Development of Photo-injectors – A.Y. Murokh (RadiaBeam), R.B. Agustsson, H. Badakov,S. Boucher, L. Faillace, P. Frigola (RadiaBeam) J.B. Rosenzweig (UCLA)A recent success of the LCLS X-ray FEL sparked a significant interest towards the ultrahigh brightness photo-injectors. RadiaBeam Technologies develops and offers commercially a modified version of the LCLS-type gun.In this paper an overview is presented of a photo-injector for FERMI FEL II project (presently in fabrication),and the research efforts are discussed to advance repetition rate, quantum efficiency and beam dynamics inthe photo-injectors beyond the state-of-the-art performance.

THPB073 Initial RF Tests of the Diamond S-band Photocathode Gun – C. Christou (Diamond), S.A. Pande (Diamond)An S-band photocathode electron gun designed to operate at repetition rates up to 1 kHz CW has been de-signed at Diamond and manufactured at FMB*. The first test results of this gun are presented. Low-powerRF measurements have been carried out to verify the RF design of the gun, and high-power conditioning andRF test has begun. Initial high power tests have been carried out at 5 Hz repetition rate using the S-band RFplant normally used to power the Diamond linac: the benefits and limitations of this approach are considered,together with plans for further testing.

THPB074 RF Photoinjector and Radiating Structure for High-power THz Radiation Source – S.M. Polozov (MEPhI),T.V. Bondarenko (MEPhI) Y.A. Bashmakov (LPI)Sources of high-power electromagnetic radiation in THz band are becoming promising as a new method of alow activation introscopy. Research and development of accelerating RF photoinjector and radiating systemfor THz radiation source are reported. The photoinjector is based on disk loaded waveguide (DLW). Two differ-ent designs of accelerating structures were modeled: widespread 1.6 cell of DLW structure and travelling waveresonator structure. The resonant models of these structures and the structures with power ports were de-signed. Electrodynamics characteristics and electric field distribution for all models were acquired. Results ofpicoseconds photoelectron beam dynamics in modeled structures are reported. Design of decelerating struc-tures exciting Cherenkov radiation are based on corrugated metal channel and metal channel coated withdielectric. Analysis of radiation intensity and frequency band are presented.

THPB075 Theoretical and Practical HOM-Analysis of the Rossendorf SRF-Gun – A. Arnold (HZDR), P. Murcek, J. Te-ichert, R. Xiang (HZDR)The success of future synchrotron radiation sources and high power IR free-electron lasers (FELs) largely de-pends on the development of an appropriate electron source. To this moment, the superconducting radiofrequency photoinjector (SRF gun) seems to be a promising candidate to achieve the required brightness andthe high average current at the same time. In contrast to normal conducting DC and RF guns, now multi-buncheffects of higher order modes (HOM) and their influence on beam quality are of particular interest. For thisreason, we present a method that considers the accelerated motion of the nonrelativistic electrons in the guncavity to calculate the longitudinal and transverse coupling impedances. Based on this results the requiredloaded quality factors to reduce the excited fields of the HOMs are determined. Additionally, a second methodis discussed using both cavity tuners for selective detuning of the eigenmode spectra, while the fundamentalmode frequency is keeping constant. Finally, the results are compared with first beam-based measurements atthe existing SRF gun at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR).

THPB076 Design Issues of the 90 mA Proton Source for the ESS Facility – L. Celona (INFN/LNS), G. Ciavola, S. Gam-mino, D. Mascali (INFN/LNS) C. Caliri, G. Castro, R. Di Giugno (Universita Degli Studi Di Catania)The European Spallation Source facility will be one of the fundamental instruments for science and engineer-ing of the future. A 2.5 GeV proton accelerator is to be built for the neutron and INFN-LNS is involved in theDesign Update for the proton source and LEBT. The proton source is required to produce a low emittance 90mA proton beam, 2.86 ms pulsed with a repetition rate of 14 Hz. Microwave Discharge Ion Sources (MDIS) en-able us to produce such high intensity proton beams characterized by very low emittance (<0.2π mm mrad).The use of alumina (Al2O3) and other insulator coating the plasma chamber allow to increase the proton frac-tion and the total extracted beam. A further strong increase of extracted current is expected by totally or par-tially using electrostatic Bernstein waves heating, which permits a strong increase in the electron density. Thesource design issues will be given along with some relevant experimental data obtained with similar devices,as the Versatile Ion Source (VIS).


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THPB077 Studies for a 50 mA H2+ Source for the DAEδALUS Experiment – L. Celona (INFN/LNS), C. Caliri, G. Castro,R. Di Giugno, S. Gammino, D. Mascali (INFN/LNS) G. Ciavola (CNAO Foundation)High current Superconducting Cyclotrons have been studied for different application and efforts are underway to design a multi-mA system able to accelerate H2+ beams for DAEδALUS experiment. An ion source ableto produce up to a 50 mA of H2+ beams is needed for the injector stage. The Versatile Ion Source (VIS) canbe used for this purpose: it is a off-resonance microwave discharge source operating up to 75 and producingup to 90 mA of proton beams. Moreover, the VIS source ensures long time operations without maintenanceand high reliability. VIS has been developed to maximize the production of proton, so several changes areneeded to produce a 50 mA H2+ beam. The extraction electrodes geometry need to be partially redesigned,while the placement of insulators coating the plasma chamber needs to be modified. Furthermore a partialuse of electrostatic waves enable us to modify the electron energy distribution function, in order to maximizeH2+ with respect to H+. Experimental data obtained at different source parameters will be given along withdesign issues that have been changed in order to get to a set-up fulfilling the DAEδALUS project requirements.

THPB078 Light Ion ECR Sources State-of-the-art for Linacs – R. Gobin (CEA/DSM/IRFU), N. Chauvin, O. Delferrière,O. Tuske (CEA/DSM/IRFU)Since the middle of the 90’s development of high intensity light ion injectors are undertaken at CEA-Saclay. Thefirst 100 mA proton beam has been produced by the SILHI ECR source in the framework of the IPHI project.Ever since, more than 100 mA of protons or deuteron beams, with high purities, have been regularly producedin pulsed or continuous mode, and with very good beam characteristics analyzed in dedicated beam diagnos-tics. CEA-Saclay is currently involved in several high intensity LINAC projects such as Spiral2, IFMIF-EVEDAand FAIR, and is in charge of their source and LEBT design and construction. This article reports the latestdevelopments and experimental results carried out at CEA-Saclay for the 3 projects. In addition, a review ofthe developments and beam results performed in other laboratories worldwide will be also presented.

03 TechnologyTHPB079 Development of a Superconducting Focusing Solenoid for CADS – W. Wu (IMP), S.F. Han, Y. He, L.Z. Ma,

D.S. Ni, Z.J. Wang, B.M. Wu, W.J. Yang, X.L. Yang (IMP)A superconducting focusing solenoid has been designed and developed for the China Accelerator Driven Sys-tem (CADS). In order to meet the requirement of focusing strength and fringe field while minimizing physicalsize of the solenoid, the novel optimizing design method based on linear programming method was employed.In this report, we will introduce the design of the solenoid including magnetic field optimization, mechanicaldesign and quench protection. The fabrication and the test results of the solenoid will also be introduced inthis report.

04 Extreme Beams, Sources and Other TechnologiesTHPB080 Development and Application of the Trigger Timing Watchdog System in the KEK Electron/Positron Linac –

M. Satoh (KEK), K. Furukawa, T. Suwada (KEK) T. Kudou, S. Kusano (MELCO SC)The KEK injector linac provides electrons and positrons to several accelerator facilities. A 50 Hz beam-modeswitching system has been constructed to realize simultaneous top-up injections for Photon Factory and theKEKB high- and low-energy rings, which require different beam characteristics. An event-based timing andcontrol system was built to change the parameters of various accelerator components within 20 ms. The com-ponents are spread over a 600-m-long linac and require changes to a total of 100 timing and control param-eters. The system has been operated successfully since the autumn of 2008 and has been improved upon asbeam operation experience has been accumulated. The timing watchdog and alert system are indispensablefor the stable and high quality beam operation. For this purpose, we developed and utilized several timingwatchdog system. We will present the detail of timing signal watchdog system for the KEK injector linac.

THPB081 The Development of Timing Control System for 3.5 MeV RFQ – J.N. Bai (IHEP), S. Xiao, T.G. Xu, L. Zeng (IHEP)Timing control system based on VME configuration is developed to meet the need of 3.5 MeV RFQ. An EPICSdriver is provided to control its work. The timing control system satisfies request after examination. In thefuture, it will be used in the machine running. This paper introduces the Timing control hardware, VME inter-face, EPICS driver for Timing control system and MEDM operator interface.

THPB082 The Development of EPICS Driver for High Voltage Supplies System – J.N. Bai (IHEP), F. Li, W. Pan, J.M. Tian,L. Zeng (IHEP)The Iseg-VHQ 204L with option M-h is chosen as high voltage supply for sensors of the BLM of the CSNSproject. An EPICS driver for this device has been developed. The High voltage supply system more than satis-fies the request after examination. In the future, it will be used in the running machine. In this paper the EPICSdriver and the Control Interface for the VHQ 204L will be presented.

03 TechnologyTHPB083 Status of E-XFEL String and Cryomodule Assembly at CEA-Saclay – C. Madec (CEA) S. Berry, J.-P. Char-

rier, A. Dael, M. Fontaine, Y. Gasser, O. Napoly, Y. Sauce, C.S. Simon, T.V. Vacher, B. Visentin (CEA/DSM/IRFU)A. Brasseur, P. Charon, C. Cloue, S. Langlois, G. Monnereau, J.L. Perrin, D. Roudier, N. Sacepe (CEA/IRFU)As In-Kind contributor to E-XFEL project, CEA is committed to the integration on the Saclay site of the 100cryomodules of the superconducting linac as well as to the procurement of the magnetic shieldings, superin-sulation blankets and 31 cold beam position monitors of the re-entrant type. The assembly infrastructure hasbeen renovated from the previous Saturne Synchrotron Laboratory facility: it includes a 200 m2 clean room


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complex with 120 m2 under ISO4, 1325 m2 of assembly platforms and 400 m2 of storage area. In parallel,CEA has conducted industrial studies and three cryomodule assembly prototyping both aiming at preparingthe industrial file, the quality management system and the commissioning of the assembly plant, tooling andcontrol equipments. In 2012, the contract of the integration will be placed to a subcontractor. The paper willsummarize the outputs of the preparation and prototyping phases and the up-coming industrial phase.

THPB084 A Low-Level RF Control System for a Quarter-Wave Resonator – J.-W. Kim (NCC, Korea) C.K. Hwang (KAERI)D.G. Kim (IBS)A low-level rf control system was designed and built for an rf deflector, which is a quarter wave resonatorand was designed to deflect a secondary electron beam to measure the bunch length of an ion beam. Thedeflector has a resonance frequency at near 88 MHz, and its required phase stability is approximately ±1o andamplitude stability less than ±1%. The control system consists of analog input and output components, and adigital system based on an FPGA for signal processing. It is a cost effective system, while meeting the stabilityrequirements. Some basic properties of the control system were measured. Then the capability of the rf controlhas been tested using a mechanical vibrator made of a dielectric rod attached to an audio speaker system,which can induce regulated perturbation in the electric fields of the resonator. The control system is flexiblesuch that its parameters can be easily configured to compensate for disturbance induced in the resonator.

THPB085 LLRF Automation for the 9mA ILC Tests at FLASH – J. Branlard (DESY), V. Ayvazyan, O. Hensler, H. Schlarb,Ch. Schmidt, M. Walla (DESY) W. Cichalewski, W. Jałmuzna (TUL-DMCS)Since 2009 and under the scope of the International Linear Collider (ILC) R&D, a series of studies takes placetwice a year at the Free electron Laser accelerator in Hamburg, (FLASH) DESY, in order to investigate technicalchallenges related to the high-gradient, high-beam-current design of the ILC. Such issues as operating cavi-ties near their quench limit with high beam loading or in klystron saturation regime are investigated, alwayspushing the limits of FLASH nominal operational conditions. To support these studies, a series of automa-tion algorithms have been developed and implemented at DESY. These include automatic detection of cavityquenches, automatic adjustment of the superconducting cavity quality factor, and automatic compensationof detuning due to Lorentz forces. This paper explains the functionality of these automation tools, detailsabout their implementation, and shows the experience acquired during the last 9mA ILC test which took placeat DESY in February 2012. The benefit of these algorithms and the R&D results these automation tools havepermitted will be clearly explained.

THPB086 Precision Regulation of RF Fields with MIMO Controllers and Cavity-based Notch Filters – Ch. Schmidt(DESY), J. Branlard, H. Schlarb (DESY) W. Jałmuzna (TUL-DMCS)The European XFEL requires a high precision control of the electron beam, generating a specific pulsed laserlight demanded by user experiments. The low level radio frequency (LLRF) control system is certainly one ofthe key players for the regulation of accelerating RF fields. A uTCA standard LLRF system was developed and iscurrently under test at DESY. Its first experimental results showed the system performance capabilities. Inves-tigation of regulation limiting factors evidenced the need for control over fundamental cavity modes, whichis done using complex controller structures and filter techniques. The improvement in measurement accu-racy and detection bandwidth increased the regulation performance and contributed to integration of furthercontrol subsystems.

THPB087 An Upgrade to the Klystron Drive Subsystem of the Advanced Photon Source Linear Accelerator – A.E. Gre-lick (ANL), T.G. Berenc, D. Horan, M.E. Middendorf, A.F. Pietryla (ANL)The driver amplifiers for the 45-MW peak power output klystrons used in the Advanced Photon Source lin-ear accelerator were implemented with pulsed solid state amplifiers operating in class C. These amplifiershave now become obsolete and are no longer repairable. The klystron drive subsystem has been recently re-designed to use currently available linear amplifiers and an amplitude modulator VXI module. These and othernecessary changes, resulting performance, and current implementation status are discussed.

THPB088 Phase Stability at the J-PARC Linac – K. Futatsukawa (KEK), S. Anami, Z. Fang, Y. Fukui, T. Kobayashi,S. Michizono (KEK) F. Sato (JAEA) S. Shinozaki (JAEA/J-PARC)The amplitude and the phase stabilities of the RF system play an important role for the cavity of a high in-tensity proton accelerator. For the J-PARC Linac, the accelerating field ambiguity must be maintained within±1% in amplitude and ±1 degree in phase due to the momentum acceptance of the next synchrotron. To re-alize the requirement, a digital feedback (FB) control is used in the low level RF (LLRF) control system, and afeed-forward (FF) technique is combined with the FB control for the beam loading compensation. The sta-bility of ±0.2% in amplitude and ±0.2 degree in phase of the cavity was achieved including the beam loadingin a macro pulse. Additionally, the cavity phase monitors, which can measure the phase difference betweenany two cavities, were installed in summer, 2011. The monitor has the three different types, which are for thepresent 324 MHz RF system, the 972 MHz RF system and the combined system of 324 MHz RF and 972 MHzRF. The phase monitor for the 324 MHz RF has been in operated since Dec. 2011. We would like to introducethe phase monitor and indicate the phase stability at the J-PARC Linac.


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THPB089 Magnetic Characterization of the First Phase Shifter Prototypes Built by CIEMAT for E-XFEL – I. Moya(CIEMAT), J. Calero, J.M. Cela-Ruiz, L. García-Tabarés, A. Guirao, J.L. Gutiérrez, T. Martínez de Alvaro, E. MolinaMarinas, L. Sanchez, F. Toral, J.G.S. de la Gama (CIEMAT) J. Campmany, J. Marcos, V. Massana (CELLS-ALBASynchrotron) S. Sanz (Tecnalia Research & Innovation)The European X-ray Free Electron Laser (E-XFEL) will be based on a 10 to 17.5 GeV electron linac that will beused in the undulator system to obtain ultra-brilliant X-ray flashes from 0.1 to 6 nanometres for experimenta-tion. The undulator system is formed by undulators and intersections between them, where a quadrupole ontop of a precision mover, a beam position monitor, two air coils and a phase shifter are allocated. The functionof the phase shifter is to adjust the phase of the electron beam and the radiation when they enter in an undula-tor according to the different beam energies and wavelengths. CIEMAT is working on the development of thephase shifters, as part of the Spanish in-kind contribution to the E-XFEL project. Several problems reportedelsewhere were detected in the first prototype, which did not fulfil the first field integral specification. Thispaper describes the magnetic measurements realized on the second and third prototypes in the test bench atCELLS, together with the tuning process to decrease the field integral dependence with gap.

THPB090 Failure Tolerance Studies in the CLIC Main Linac and Beam Delivery System – C.O. Maidana (CERN),M. Jonker, A. Latina (CERN)The proposed Compact Linear Collider (CLIC) is based on a two-beam acceleration scheme. The energy oftwo high-intensity, low-energy drive beams is extracted and transferred to two low-intensity, high-energy mainbeams. The machine components need to be protected from damage caused by ill controlled beams. Failurescenarios need to be studied to estimate the potential damage to the machine structures. This paper presentsresults of the beam response to kicks caused by various failures (correctors, quadrupole displacement, RFbreakdown) in the main linac and in the beam delivery system. The maximum tolerable beam kicks to avoiddamage to collimators (i.e. the most restrictive aperture in the machine) are determined as a function of kicklocation.

THPB091 Machine Protection Issues and Solutions for Linear Accelerator Complexes – M. Jonker (CERN)The workshop “Machine Protection focusing on Linear Accelerator Complexes” was held from 6-8 June 2012at Cern. This workshop brought together experts working on machine protection systems for accelerator fa-cilities with high brilliance or large stored beam energies, with the main focus on linear accelerators and theirinjectors. An overview of the machine protection systems for several accelerators was given. Beam loss mech-anisms and their detection were discussed. Mitigation of failures and protection systems were presented. Thispaper summarises the workshop and reviews the current state of the art in machine protection systems.

THPB092 Recent Improvements in SPring-8 Linac for Early Recovery from Beam Interruption – S. Suzuki (JASRI/SPring-8), T. Asaka, H. Dewa, H. Hanaki, T. Kobayashi, T. Magome, A. Mizuno, T. Taniuchi, K. Yanagida (JASRI/SPring-8)The 1GeV SPring-8 linac is an injector for the SPring-8 synchrotron radiation storage ring with 8GeV boostersynchrotron. In recent years, backup systems were installed to eliminate long-time interruption of the beaminjections: The main gun system is usually operated, and the second gun is always pre-heated and can injectelectron beams into a buncher section with an interval of several minutes in case the main gun failed. The firstklystron, that feeds RF powers to the buncher system and the downstream klystrons, can be relieved by thenext klystron with an interval of about 20 minutes by switching the waveguide circuit. When one of the elevenworking klystrons faults, one of standby klystrons, which are kept for hot spares on line, is automatically acti-vated to accelerate beams instead of the failed one without beam interruption. The total downtime in FY2012was 0.12% in top-up operation user time. The averaged fault frequency was 0.2 times per day.

THPB093 CST Modeling of Key Elements of a Resonator for an Electrostatic FEL – H. S. Marks (University of Tel-Aviv,Faculty of Engineering)Results of modeling in CST of a W-band (75-110 GHz) corrugated waveguide and Confocal Splitter currentlywithin the wiggler of an electrostatic accelerator free electron laser are presented together with experimentalS-parameter measurements made of the device. The Confocal Splitter is a component of an FEL resonatorfor decoupling the radiative power that is generated in the resonator from the electron beam in traversing thewiggler, without the need to deflect the electron beam. The power out of the resonator is controlled by a 3 gridsystem. The wires of the first and third grid are fixed vertically, whilst the centre grid can be rotated using amotor, thus varying the transmission and reflectivity of the resonator.

THPB094 Performance of Beam Chopper at SARAF via RF Deflector Before the RFQ – A. Shor (Soreq NRC), D. Berkovits,A. Grin, L. Weissman (Soreq NRC)We describe performance of a beam chopper at the SARAF accelerator consisting of an HV deflector precedingthe RFQ. The deflector and electronics, developed at LNS Catania, was designed to provide slow beam chop-ping for beam testing and diagnostics where low beam power is necessary. The HV deflector sweeps awaythe low energy beam onto a water cooled beam catcher, while a fast HV switch momentarily switches off theHV whenever a transmitted beam to the RFQ is desired. We report on measurements with this chopping sys-tem, where minimum transmitted beam pulse of 180 ns duration is attained with a rise and fall time of severalnano-seconds. We performed beam dynamics simulations of SARAF Phase-I, including the deflector, wherethe short rise and fall times of the chopped beam is attributed to the tight collimation of the deflected beamprovided by the RFQ and the fast Faraday Cup. We also describe beam dynamics simulations which suggestthat single RFQ bunch selection can be achieved with the existing chopping system, during zero-crossover forpositive-negative deflecting HV waveform.


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04 Extreme Beams, Sources and Other TechnologiesTHPB095 Designing of a Phase-mask-type Laser Driven Dielectric Accelerator for Radiobiology – K. Koyama (UTNL)

A. Aimidura, M. Uesaka (The University of Tokyo, Nuclear Professional School) Y. Matsumura (University ofTokyo) T. Natsui, M. Yoshida (KEK)In order to estimate the health risk of a low radiation dose, basic processes of the radiobiology should be clar-ified by shooting a DNA using a spatially and temporary defined particle beam or X-ray. A suitable beam sizeis as small as a resolving power of an optical microscope of a few hundred nanometers. Photonic crystal ac-celerators (PCA) are capable of delivering nm-beams of sub-fs pulses because the characteristic length andfrequency of PCAs are on the order of the laser light. Since the phase-mask type accelerator has a simplerstructure than other types of PCAs, we are designing a phase-mask type laser driven dielectric accelerator. Byadopting an unbalanced length of pillar and ditch (grating) of 4:1, a standing wave like acceleration field isproduced in a acceleration channel. A pillar height and initial speed of injected electron are determined byanalytically. The maximum acceleration gradient of 2 GeV/m is estimated. The required laser power is roughlyestimated to be 6.5 GW. The simulation using CST-code also shows similar values to accelerate electrons by thephase-mask type accelerator.

THPB096 High-power Sources of RF Radiation Driven by Periodic Laser Pulses – S.V. Kuzikov (IAP/RAS), A.V. Savilov(IAP/RAS)A fast, periodic modulation of electron RF sources can be carried out in a form of Q-factor switching by meansof fast RF switches, or in a form of I-switching by means of the bunched electron beam. If modulation fre-quency equals to time which is necessary for RF radiation to travel along the cavity and to come back, the RFoscillator can produce periodic, giant, short pulses which are desirable for many applications in order to avoida breakdown. The produced RF pulses are phase and frequency locked by modulation shape. The mentionedeffects of the phase and frequency locking remain also possible for RF sources operated in a single-moderegime. In last case the modulation frequency should be close to natural single-mode oscillation frequency.For example, one might control operation of a BWO by means of a small periodical modulation of the electronvoltage in a drift section in-between a cathode and the corrugated interaction section. The necessary voltagemodulation can be provided by means of a DC generator those voltage due to a photoconductivity is externallymodulated with definite frequency by laser which irradiates GaAs isolator inserted in-between the electrodes.

02 Proton and Ion Accelerators and ApplicationsTHPB097 FRIB Front End Design Status – E. Pozdeyev (FRIB), N.K. Bultman, G. Machicoane, G. Morgan, X. Rao, Q. Zhao

(FRIB) V.L. Smirnov, S.B. Vorozhtsov (JINR) J. Stovall (CERN) L.T. Sun (IMP) L.M. Young (LANL)The Facility for Rare Isotope Beams (FRIB) will provide a wide range of primary ion beams for nuclear physicsresearch with rare isotope beams. The FRIB SRF linac will be capable of accelerating medium and heavy ionbeams to energies beyond 200 MeV/u with a power of 400 kW on the fragmentation target. This paper presentsthe status of the FRIB Front End designed to produce uranium and other medium and heavy mass ion beamsat world-record intensities. The paper describes the FRIB high performance superconducting ECR ion source,the beam transport designed to transport two-charge state ion beams and prepare them for the injection in tothe SRF linac, and the design of a 4-vane 80.5 MHz RFQ. The paper also describes the integration of the frontend with other accelerator and experimental systems.


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FR1A — Invited Oral PresentationsChair: R.E. Laxdal (TRIUMF, Canada’s National Laboratory for Particle and Nuclear Physics)

04 Extreme Beams, Sources and Other TechnologiesFR1A01

08:30Heavy Ion Stripper – F. Marti (FRIB)Stripping of high current heavy ion beams is a key technology for future accelerator as FAIR (Germany) andFRIB (USA) and current ones as RIBF (RIKEN, Japan). A small change in the peak charge state produced atthe stripper could require a significant expense in additional accelerating stages to obtain the required finalenergy. The main challenges are the thermal effects due to the high power deposition (∼ 50 kW/mm3) andthe radiation damage due to the high energy deposition. The effects of heavy ion beams are quite differentfrom proton beams because of the much shorter range in matter. We will present an overview talk consideringcharge stripping devices like carbon foils and gas cells used worldwide as well as the current research effortson plasma stripping, liquid metal strippers, etc. The advantages and disadvantages of the different options willbe presented.

FR1A0209:00

Light Ion ECR Sources State of Art for Linacs – R. Gobin (CEA/IRFU) N. Chauvin, O. Delferrière, O. Tuske (CEA/DSM/IRFU)Since the middle of the 90’s development of high intensity light ion injectors are undertaken at CEA-Saclay. Thefirst 100 mA proton beam has been produced by the SILHI ECR source in the framework of the IPHI project.Ever since, more than 100 mA of protons or deuteron beams, with high purities, have been regularly producedin pulsed or continuous mode, and with very good beam characteristics analyzed in dedicated beam diagnos-tics. CEA-Saclay is currently involved in several high intensity LINAC projects such as Spiral2, IFMIF-EVEDAand FAIR, and is in charge of their source and LEBT design and construction. This article reports the latestdevelopments and experimental results carried out at CEA-Saclay for the 3 projects. In addition, a review ofthe developments and beam results performed in other laboratories worldwide will be also presented.

FR1A0309:20

Commissioning and Operation of the Californium Rare Ion Breeder Upgrade at the ATLAS facility –G. Savard (ANL)Recently commissioned Californium Rare Ion Breeder Upgrade (CARIBU) of the Argonne National LaboratoryATLAS facility provides low-energy and reaccelerated neutron-rich radioactive beams to address key nuclearphysics and astrophysics questions. In its present configuration, a 70 mCi 252Cf source produces fission frag-ments which are thermalized and collected by a helium gas catcher into a low-energy particle beam with acharge of 1+ or 2+. An electron cyclotron resonance (ECR) ion source functions as a charge breeder in order toraise the ion charge sufficiently for acceleration in the ATLAS linac. The final CARIBU configuration will uti-lize a 1 Ci 252Cf source to produce radioactive beams with intensities up to 106 ions/sec for use in the ATLASfacility. The ECR charge breeder has achieved record high charge breeding efficiencies of radioactive beams.

02 Proton and Ion Accelerators and ApplicationsFR1A04

09:50In Flight Ion Separation using a Linac Chain (TRIUMF) – M. Marchetto (TRIUMF, Canada’s National Labora-tory for Particle and Nuclear Physics)The ISAC accelerator complex now can accelerate radioactive heavy ion beams to above the Coulomb Barrier.Recently an ECR type charge state booster has been added to allow the acceleration of radioactive beams withmasses A>30. A characteristic of the ECR source is the efficient ionization of background species that canoverwhelm the low intensity RIB beam. The long linac chain at ISAC can be used to provide some in flightseparation both in time domain and in spatial domain analogous to fragment separators at in-flight fragmen-tation facilities. The talk will summarize the work done at TRIUMF to develop tools to aid in the filtration anddiagnosis of beam purity in the post acceleration of charge bred beams. Marco Marchetto has been leadingthis effort.

FR1A0510:10

SARAF Phase 2 Linac Physical Design Study – J. Rodnizki (Soreq NRC)SARAF phase II SC linac is designed for 5 mA 40 MeV proton and deuteron beams. Two options are studied: A176 MHz Half Wave Resonator (HWR) lattice similar to the present SARAF lattice and a 109 MHz Quarter WaveResonator (QWR) lattice. For the HWR lattice an elliptic shape is studied for the internal wall to compensate thequadrupole effect due to the stronger vertical fields along the HWR. The QWR non-symmetric magnetic fieldcomponent is compensated by introducing a drift tube face tilt angle. An analytical approximation is used toevaluate the on-axis beam steering behaviour. Two 176 MHz HWR and two 109 MHz QWR cavities, βg=0.08and 0.15, were EM designed, field and beam dynamics were simulated and optimized. Both design latticesincluding RFQ double bunchers MEBT and linac demonstrated high efficiency acceleration with no losses for1M macro particle nominal simulation and a 100 realizations run, 100k macro particles each, with a feasibledynamic and static error range. In both designs only the MEBT tune is re evaluated to match the beam from0-5 mA. An error corrector scheme under realistic assumptions is under study.


rinana

תיבת מלל

The Soreq NRC initiated the establishment of SARAF - Soreq Applied Research Accelerator Facility. SARAF will be a multi-user facility for basic research, e.g., nuclear astrophysics, radioactive beams, medical and biological research; neutron based non-destructive testing (using a thermal neutron camera and a neutron diffractometer) and radio-pharmaceuticals research, development and production. The SARAF continuous wave (CW) accelerator is planned to produce variable energy (5-40 MeV) proton and deuteron beam currents (0.04-5 mA). Phase I of SARAF (ion source, radio-frequency quadrupole (RFQ), and one cryomodule housing 6 half-wave resonators (HWR) was installed and being operated at Soreq NRC delivering CW 1mA 3.5 MeV proton beams and low-duty cycle (0.0001) 0.3 mA 4.7 MeV deuteron beams. SARAF is designed to enable hands-on maintenance, which implies very low beam losses for the entire accelerator. The physics design of two options is explored to subsequently develop a conceptual design for selected option for extending the linac to its planned beam parameters (SARAF Phase-II: 40 MeV, 5 mA protons and deuterons).

rinana

תיבת מלל

P.N. Ostroumov, Z.A. Conway, M.P. Kelly, A.A. Kolomiets,

rinana

תיבת מלל

S.V. Kutsaev and B. Mustapha (ANL), J. Rodnizki. (Soreq NRC)

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FR2A — Invited Oral PresentationsChair: R. Garoby (CERN)

02 Proton and Ion Accelerators and ApplicationsFR2A01

11:00Recovery of the J-PARC Linac from the Earthquake – K. Hasegawa (J-PARC, KEK & JAEA)Following the amazingly quick recovery from the disastrous earthquake in March 2011, and in the interests ofpromoting robust designs of linacs, it would be interesting to learn what the J-PARC team reckons are the keyfeatures of accelerator design and construction that lead to strong and reliable hardware.

04 Extreme Beams, Sources and Other TechnologiesFR2A02

11:30Antihydrogen Trapping and Probing at the Alpha-CERN Experiment – E. Sarid (NRCN) A.C. Collaboration(CERN)Precision spectroscopic comparison of hydrogen and antihydrogen (AH) holds the promise of sensitive tests ofthe Charge/Parity/Time (CPT) theorem and matter-antimatter equivalence. The clearest path towards realiz-ing this goal is to hold a sample of AH atoms in an atomic trap for interrogation by electromagnetic radiation.At the ALPHA experiment in CERN, AH atoms are produced from antiprotons and positrons stored in the formof non-neutral plasmas, where the typical electrostatic potential energy per particle is on the order of eV, morethan 104 times the maximum trappable kinetic energy. During the last two years ALPHA demonstrated the firsttrapping of AH atoms (*November 2010), the ability to hold the trapped AH atoms for 1000s (**June 2011), andthe first resonant microwave interactions probing the hyperfine structure of the AH ground state (***March2012). With microwave resonant radiation we succeeded making positron spin flips, making trapped atomsun-trappable. An upgraded version of the ALPHA experiment will allow us to progress towards microwave andlaser precision spectroscopy of the trapped antihydrogen atoms.


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Boldface papercodes indicate primary authors

— A —

Abernathy, J.M. MOPB026, TUPB081Ackermann, S. TUPLB03, TUPB003Ackermann, W. TUPB085Adli, E. MOPB009Adolphsen, C. MOPB029, MOPB044, TUPLB11, TUPB089Adonev, O.A. TUPB023Afanador, R. TUPB050Agustsson, R.B. MOPB019, MOPB050, THPB072Ahammed, M. MOPB091Ahuja, R. TUPB033Aiba, M. TUPB013Aimidura, A. THPB095Ainsworth, R. SUPB018, TUPB048, TUPB052Alberty Vieira, L. TUPB047Aleksandrov, A.V. THPB013, THPB044Alesini, D. MOPLB09, MOPB080Alessi, J.G. TUPB105Alex, J. TUPB009Al-Malki, M.H. TUPB085Almomani, A. THPB006Altinbas, Z. MOPB064Ambattu, P.K. MOPLB08, MOPB004, MOPB079Amberg, M. SUPB022, SUPB023, TUPB071, TUPB072Ames, F. MOPB024, MOPB026Anami, S. THPB088Anders, W. MOPB067, THPLB12, THPB066Andersson, A. SUPB008, MOPB045Andonian, G. TUPB088André, T. TUPB029Andrews, H.L. TUPB086Ang, Z.T. MOPB033Angal-Kalinin, D. MOPB011Antipov, S.P. MOPLB03, MOPLB05, MOPLB11, MOPB041, MOPB047, MOPB093Antoniazzi, L. TUPB094, THPLB08, THPB040Ao, H. THPB020Aoyama, M. TUPLB10, TUPB080Arai, S. TUPB095Arenius, D. TU1A04Arenshtam, A. MO1A01Arimoto, Y. MO3A04Arnaudon, L. TUPB047, THPB010Arnau-Izquierdo, G. MOPB075Arnold, A. THPB075Asaka, T. THPB092, TUPB006Asano, H. TUPB100, THPB020Atieh, S. MOPB075Atkinson, T. SUPB003, SUPB004, MOPB036, MOPB037Aulenbacher, K. SUPB023, TUPB072Austin, B. TUPB016Aviles Santillana, I. MOPB075Ayvazyan, V. TUPB019, THPB085Ayzatskiy, M.I. MOPB023Azima, A. TUPLB03, TUPB003

— B —

Baartman, R.A. MOPB024Badakov, H. THPB072Bai, J.N. SUPB036, SUPB037, THPB081, THPB082Bajt, S. TUPLB03, TUPB003


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Barcikowski, A. TUPLB08, TUPB046Baricevic, B.B. TUPB085Barnyakov, A.M. SUPB009, MOPB048Barth, W.A. SUPB023, MO3A01, TUPB035, TUPB072, TUPB074, THPLB07, THPB034, THPB035Bartolini, R. TUPB086Bashmakov, Y.A. SUPB035, THPB074Basovic, M. MOPB068Bathe, B.N. MOPB032Baudrenghien, P. THPB010Bazin, N. MOPB074Beard, K.B. MOPB014Beaudoin, B.L. THPLB11, THPB061Bechtold, A. THPB047Beebe, E.N. TUPB105Bellaveglia, M. MOPLB09, MOPB080Bellodi, G. THPB010, THPB011Belomestnykh, S.A. MOPB063, MOPB064, MOPB063, MOPB064Ben Aliz, Y. MO1A01Ben-Zvi, I. MOPB063, MOPB064, TU2A04Berenc, T.G. THPB087Berezov, R. THPB034Berkovits, D. MO1A01, THPB094Bernal, S. THPLB11, THPB061Bernard, E.C. MOPLB10, MOPB090, TU1A04, TUPB040Bernaudin, P.-E. TUPB051Berry, S. THPLB09, THPB083Bertone, C. THPB010Bertrand, P. TH2A02Bettoni, S. TUPB013Beutner, B. TUPB013Bhandari, R.K. MOPB076Bharadwaj, V. TUPB086Bhattacharyya, P. MOPB076Biarrotte, J.-L. THPB033Bice, D.J. SUPB030, MOPB078Binyukov, P.V. TUPB023Bird, B. TUPB040Birney, P.S. TUPB081Bishofberger, K. TH1A05Blednykh, A. MOPB040Blot, F. MOPB013Blumer, H. TUPB009Body, Y. THPB010Bödewadt, J. TUPLB03, TUPB003Bogacz, S.A. MOPB014Bondarenko, A.V. SUPB003, SUPB004, MOPB036, MOPB037Bondarenko, T.V. SUPB035, THPB074Boni, R. MOPLB09, MOPB080Bopp, M. TUPLB01, TUPB009, TUPB010, TUPB012Borowiec, P.B. MOPB017Bosland, P. MOPB074, TUPB051Bosotti, A. MOPB017, TUPB020Boucher, S. MOPB019, MOPB050, TUPB088, THPB072Boulware, C.H. MOPB064Bousson, S. TUPB064Brackebusch, K. MOPB067Branlard, J. MOPB017, TUPB019, THPB085, THPB086Brasseur, A. THPLB09, THPB083Brault, S. TUPB064Brinkmann, A. MOPB058Brodhage, R. M. MO3A01Broere, J.C. THPB010


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Brossard, J. MOPB013Broyles, M. TUPB050Brueck, H. MOPB017Bruni, C. MOPB013Brunner, O. THPB010Brutus, J.C. MOPB063, MOPB064Buckley, S.R. MOPLB08, MOPB079Bultman, N.K. TU1A04, TUPB040, THPB097Burandt, C. SUPB010, TUPB026Burrill, A. MOPB030, MOPB064Burrows, P. SUPB008, MOPB045Burt, G. MOPLB08, MOPB004, MOPB079Busch, M. SUPB022, SUPB023, TUPB071, TUPB072Butkowski, L. TUPLB04, TUPB004Buzaglo, Y. MO1A01Buzio, M.C.L. THPB010

— C —

Calaga, R. MOPB064Calatroni, S. MOPB075, TUPB047Calero, J. THPB089Calic, S. MOPB033Caliri, C. THPB077, THPB076Cameron, D.P. TUPB081Campmany, J. THPB089Cancelo, G.I. MOPB077, TUPB062Capatina, O. MOPB075, TUPB047Carli, C. THPB010Carlson, K. MOPB054Carneiro, J.-P. THPB014, THPB033Carver, L.R. SUPB002, MOPB028Casagrande, F. TU1A04, TUPB040Castro, G. THPB077, THPB076Cavalier, S. MOPB013Cayla, J-N. MOPB013Cela-Ruiz, J.M. THPB089Celona, L. THPB076, THPB077Chakrabarti, A. MOPB024Chalykh, B.B. TUPB032Champion, M.S. TUPB053, THPB044Chang, W. TUPB055Chao, Y.-C. MOPB024, MOPB026Charon, P. THPLB09, THPB083Charrier, J.-P. THPLB09, THPB083Chase, B. MOPB054, MOPB077, TUPB062, THPLB02, THPB015Chattopadhyay, S. TUPB025Chauvin, N. THPB078, FR1A02Cheban, S. TUPB053Chel, S. MOPB074Chen, A.Z. THPB019Chen, J. TUPB034Chen, J.E. TUPB034, THPB067Chen, Q. TUPB103Chen, S. MOPB010, THPLB04, THPB002Cheng, G. SUPB027, MOPB057Cheng, P. TUPB075Cherepenko, A. TUPLB04, TUPB004Chernousov, Y.D. SUPB009, MOPB048Cherry, G.L. TUPB068Chevallay, E. TUPB041Cheymol, B. TUPB041Chi, Y.L. MOPLB04, MOPB006, MOPB023, MOPB046, THPB025


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Chiba, Y. TUPB095Cho, M.-H. MOPB049Cho, Y.-S. TU1A05, THPB022, THPB053Choi, J. MOPB040Choroba, S. MOPB017, TUPLB04, TUPB004Chouhan, S. TU1A04Chowdhury, G.K. TUPB033Christou, C. MOPB016, THPB073Chung, Y. TUPLB06, TUPB028, TUPB030Ciavola, G. THPB077, THPB076Cichalewski, W. TUPB019, THPB085Citterio, A. TUPLB01, TUPB009, TUPB010Clarke, C.I. TUPB086, TH3A04Clemente, G. MO3A01, TUPB035, TUPB085, THPB034Cloue, C. THPLB09, THPB083Coelho Moreira de Azevedo, P.MOPB075Cole, M.D. MOPB064Coleman, A. TUPB050Collaboration, A.C. FR2A02Compton, C. MOPB071, TU1A04, TUPB040Comunian, M. TUPB032, THPB030, THPB043Conde, M.E. MOPLB05, MOPLB11, MOPB047, MOPB093Constance, B. MOPB003Conway, Z.A. MOPB073, TUPLB07, TUPLB08, TUPB046, TUPB066, TUPB067, TUPB068, TUPB087Corlett, J.N. TU2A01, TUPB016Corlett, P.A. MOPB004Corsini, R. MOPB003, MOPB009, WE1A02Corso, J.-P. THPB010Costanza, G. SUPB021, TUPB063Coupard, J. THPB010Crawford, A.C. SUPB030, MOPB078Crawford, D.J. MOPB054Crisp, J.L. TUPB093Crofford, M.T. TUPB050Cullerton, E. MOPB054, THPLB02, THPB015Curbis, F. TUPLB03, TUPB003Curry, D. TUPB084Cywinski, R. TUPB077

— D —

Dael, A. THPLB09, THPB083Dahl, L.A. TUPB035, THPLB07, THPB035Dai, J. MOPB064Dai, Z. MOPB010Dallocchio, A. THPB038, THPB010Dancila, D.S. TUPB108Danieli, E. SUPB005, TUPB007D’Auria, G. WE1A03Davidsaver, M.A. MOPB040Davidson, K.D. TU1A04, TUPB040Davis, G.K. MOPB030, MOPB031de la Gama, J.G.S. THPB089De Long, J.H. MOPB040De Prisco, R. THPB030De Silva, S.U. SUPB038, SUPB039, TH1A02, THPB062, SUPB038, SUPB039, TH1A02, THPB062Dechoudhury, S. MOPB024Decker, F.-J. MOPLB01, MOPB001, MOPB087Decking, W. MO1A02Deibele, C. TUPB084Delaup, B. TUPB047Delayen, J.R. SUPB026, SUPB038, MOPB056, MOPB072, TH1A03, THPB062Delerue, N. TUPB086


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Delferrière, O. THPB078, FR1A02D’Elia, A. MOPB027, TUPB047Delsim-Hashemi, H. TUPLB03, TUPB003Demko, J.A. TUPB050Deng, J. MOPB008, THPLB04, THPB002, MOPB010Desmons, M. TUPB094, THPLB08, THPB031, THPB038, THPB040Devanz, G. MOPB074Dewa, H. THPB068, THPB092Dexter, A.C. MOPLB08, MOPB079Di Giugno, R. THPB077, THPB076Di Pirro, G. MOPLB09, MOPB080Dickerson, C. THPB063Dickson, R. TUPB084Dima, R. SUPB015, THPB042Dimov, V.A. THPB011Ding, X.D. MOPB050Döbert, S. MOPB009Doleans, M. TUPB050Dolgashev, V.A. MOPB019, MOPB085Doolittle, L.R. TUPB016Doran, D.S. MOPLB11, MOPB093Dos Santos, N. THPB010Doucas, G. TUPB086Douglas, D.L. TUPB050Doutresssoulles, C. TUPB029Drescher, M. TUPLB03, TUPB003Droba, M. THPB006Drury, M.A. MOPB030Du, X. THPB039Du, Y.-C. MOPLB12, MOPB089Dubbs, L.J. MOPB070, MOPB071Dubrovskiy, A. MOPB032Duchesne, P. TUPB064Ducoudret, B. TUPB029Dudovich, O. MO1A01Düsterer, S. TUPLB03, TUPB003Dunning, M.P. MOPB029Duraffourg, M. TUPB041Duthil, P. TUPB064Dutt, R.N. TUPB033Dutta Gupta, A. MOPB076Dwivedi, J. THPLB05, THPB003Dyubkov, V.S. TUPB031Dyunin, E. SUPB011, TUPLB05, TUPB005Dziuba, F.D. SUPB022, SUPB023, MO3A01, TUPB071, TUPB072

— E —

Ebert, M. TUPB019Edstrom, Jr, D.R. MOPB054Ego, H. MOPB084Eichhorn, R. SUPB010, TUPB026Eisen, Y. MO1A01Ekelöf, T.J.C. TUPB108Eliyahu, I. MO1A01Elliott, K. MOPB070, MOPB071Emma, P. TUPB016Eremeev, G.V. MOPB060Eschke, J. TUPB019Esposito, M. MOPB075


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— F —

Fabris, A. MOPB083Facco, A. MOPB070, TU1A04, TUPB060, TUPB076, MOPLB10, MOPB071, MOPB090, TUPB040Fagotti, E. TUPB094, THPLB08, THPB040Faillace, L. MOPB019, MOPB050, THPB072Fang, W. SUPB031, MOPB086Fang, Z. THPB088Favale, A.J. MOPB064Feinberg, G. MO1A01Ferdinand, R. TUPB051Ferrario, M. MOPLB09, MOPB080Fila, A. MOPLB10, MOPB090Fischer, R.L. TUPB067, TUPB068Fishman, I. MO1A01, TUPB092Fliller, R.P. MOPB040Flisgen, T. MOPB067Flöttmann, K. MOPB082Focker, G.J. TUPB041Fontaine, M. THPLB09, THPB083Forck, P. TUPB085, THPB034France, A. THPB031, THPB038Fraser, M.A. TUPB047Frigola, P. THPB072Fu, S. TUPB103, THPLB01, THPB023Fukuda, S. SUPB024, TUPLB12, TUPB090Fukui, Y. THPB088Furukawa, K. THPB080Futatsukawa, K. THPB088Fuwa, Y. SUPB024, MOPLB07, MOPB053, TUPLB12, TUPB090

— G —

Gai, W. MOPLB03, MOPLB11, MOPB041, MOPB093Gajewski, K.J. TUPB108Galambos, J. MO2A02Galayda, J.N. TU2A03Galek, T. MOPB067Gallo, A. MOPLB09, MOPB080Gammino, S. THPB076, THPB077Gandolfo, N. TUPB064Ganni, V. TU1A04Gao, F. MOPB040Gao, S.L. TUPB034García-Tabarés, L. THPB089García-Garrigós, J.J. MOPB009Garoby, R. MOPB075, THPB010Gasser, Y. THPLB09, THPB083Gassner, D.M. MOPB064Gavish, I. MO1A01Geng, H. TUPB075, THPB025Gerbershagen, A. SUPB008, MOPB045, SUPB008, MOPB045Gerbick, S.M. MOPB073, TUPLB07, TUPLB08, TUPB046, TUPB066, TUPB067, TUPB068Gerhard, P. TUPB074, THPLB07, THPB035Gerigk, F. MOPB075, TH2A03, THPB010Gertz, I.G. MO1A01Gettmann, V. TUPB035, TUPB074Ghosh, S. MOPB076, TUPB033Gibson, P.E. TU1A04, TUPB040Ginsburg, C.M. MOPLB06, MOPB052Glasmacher, T . TU1A04Gobin, R. THPB031, THPB078, FR1A02Godunov, A.L. MOPB068Gössel, A. TUPB019


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Goh, G. MOPB024Gohar, M.Y.A. MOPB006Gomez-Martinez, Y. TUPB051Gong, K.Y. TUPB103Gonin, I.V. TUPB067Gonnin, A. MOPB013Goryashko, V.A. TUPB107, TUPB108Goudket, P. MOPLB08, MOPB079Goulden, A.R. MOPB004Gover, A. SUPB011, TUPLB05, TUPB005Grassellino, A. SUPB030, MOPB078Grelick, A.E. THPB087Grender, I. TUPB040Grespan, F. TUPB094, THPLB08, THPB030, THPB040, THPB041, THPB043Grimm, T.L. MOPB064Grin, A. MO1A01, THPB094Groening, L. MO3A01, MOPB098, TUPB085, THPB034Grouas, N. MOPB074Grudiev, A. MOPB027, MOPB043Gu, D. SUPB006, TUPB018Gu, Q. SUPB006, SUPB031, MOPB007, MOPB086, TUPB018, TUPB021, TUPB022Guan, X.L. TUPB076Guirao, A. THPB089Guo, Z. TUPB075Guo, Z.Y. TUPB034Gupta, P.D. THPLB05, THPB003Gutiérrez, J.L. THPB089

— H —

Haber, I. THPLB11, THPB061Hagen, U. THPB007Hagge, L. MOPB017Hahn, H. MOPB063, MOPB064Hajima, R. WE1A05Halfon, S. MO1A01Hammons, L.R. MOPB064Hammouti, L. THPB010Han, S.F. THPB079Hanaki, H. TUPLB09, TUPB079, THPB092Hanke, K. THPB010Hannah, B.S. TUPB050Hannurkar, P.R. THPLB05, THPB003Hansen, J. THPB038, THPB010Hao, J.K. THPB067Harders, I. TUPLB04, TUPB004Hardy, P. MOPB074Har-Even, D. MO1A01Harle, L.L. MOPLB10, MOPB071, MOPB090, TUPB093, TUPB040Harms, E.R. MOPB054, TUPB020Hartmann, W. THPLB07, THPB035Hartung, J. TUPLB04, TUPB004Haruvy, Y.F. MO1A01Hasegawa, K. THPB052, FR2A01Hasegawa, T. TUPB006Hashida, M. MOPLB07, MOPB053Hass, E. TUPLB03, TUPB003Hast, C. MOPB029Hayano, H. MOPLB07, MOPB025, MOPB053, MOPB069, TH1A01He, S. SUPB027, MOPB057, TUPB055He, Y. SUPB013, SUPB027, SUPB028, MOPB057, MOPB059, TUPB036, TUPB038, TUPB039,

TUPB055, THPB026, THPB027, THPB039, THPB079He, Z.Q. TUPB058


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Heid, O. TUPB091, THPB007Heilmann, M. THPB008Hein, L.M. THPB011Henderson, S. TU1A02Hensler, O. THPB085Herfurth, F. TUPB035Hermansson, L. TUPB108Heßler, C. TUPB041Higashi, Y. MOPB085Higo, T. MOPB027Higurashi, Y. MO3A02Hill, C. MOPLB08, MOPB011, MOPB079Hipp, U. TUPLB03, TUPB003Hirano, K. TUPB099, TUPB101, TUPB100Hirsch, T. MO1A01Hirschmann, D. MO1A01Hocker, A. MOPB054Hodek, M. MOPLB10, MOPB070, MOPB090Hodges, L. MOPLB10, MOPB090Hoeltermann, H. THPB007Hoff, M.D. THPB054Hofmann, I. THPB006Hogan, J. MOPB030Holek, J.V. TUPB081Holland, K. TU1A04, TUPB040Hollinger, R. THPB034Holmes, D. MOPB064Holzbauer, J.P. SUPB025, MOPB055Honkavaara, K. TUPLB03, TUPB003Hopper, C.S. SUPB026, MOPB056, MOPB072Horan, D. THPB087Horvitz, Z. MO1A01Hosoda, S. MOPB025Hou, M. MOPB022, MOPB023Howell, M.P. TUPB050Hua, Hua„J.F. MOPLB12, MOPB089Huang, D. SUPB006, MOPB007, TUPB018, TUPB021Huang, G. MOPB020, MOPB021Huang, S. THPB067Huang, S.C. SUPB027, MOPB057Huang, W.-H. MOPLB12, MOPB089Huang, Z. MOPB010Hüning, M. TUPB015Hug, F. SUPB010, TUPB026Hughes, T.J.S. TUPB091, THPB007Huhmann, R. THPB034Hutton, A. MOPB014Hwang, C.K. THPB084Hwang, J.G. TUPB104

— I —

Igarashi, Z. TUPB102Iijima, H. MOPB025Ikegami, M. MOPB094, TUPB101, MOPB096Inagaki, T. MOPB005, MOPB084, TUPB006Isaev, I.I. MOPB015Ischebeck, R. TUPLB03, TUPB003Isoyama, G. MOPB025Ito, T. TUPB099, TUPB101, TUPB100Ivannikov, V. SUPB009, MOPB048Iversen, J. MOPB058Iwasaki, A. TUPLB10, TUPB080


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Iwashita, Y. SUPB024, MO3A04, MOPLB07, MOPB053, TUPLB12, TUPB090

— J —

Jałmuzna, W. TUPB019, THPB085, THPB086Jamet, C. TUPB029Jamilkowski, J.P. MOPB064Jamison, S.P. MOPB011Jang, J. MOPB049Jang, J.-H. TU1A05, THPB022, THPB053Jecklin, N.M. TUPB047Jensch, K. MOPB017Jeon, D. TUPLB06, TUPB028, TUPB030, TUPB104Jia, H. SUPB013, TUPB038, TUPB039, THPB026Jin, K. MOPB035Jin, X. THPB039Jing, C.-J. MOPLB03, MOPLB05, MOPLB11, MOPB041, MOPB047, MOPB093Jobe, R.K. MOPB029Johnson, M.J. TU1A04, TUPB040Jones, J.K. MOPB011Jones, M.A. THPB010Jones, R.M. SUPB002, MOPLB08, MOPB027, MOPB028, MOPB079Jones, S. MOPLB10, MOPB090, TU1A04, TUPB040Jongewaard, E.N. MOPB029Jonker, M. THPB090, THPB091Joshi, S.C. THPLB05, THPB003

— K —

Kaabi, W. MOPB017Kadi, Y. TUPB047Kaiser, M. TUPB035Kaizer, B. MO1A01, TUPB092Kajioka, S.Y. TUPB081Kamigaito, O. MO3A02, TUPB073, TUPB095Kamitani, T. MOPLB02, MOPB002Kamps, T. THPLB12, THPB066, THPB069Kanareykin, A. MOPLB03, MOPLB05, MOPB041, MOPB047Kanesue, T. THPB037Kang, Y.W. TUPB050Kanjilal, D. TUPB033Karlen, D. MOPB026, TUPB081Karmakar, J. TUPB033Karnaukhov, I.M. MOPB006, MOPB023Kase, M. TUPB095Kashiwagi, S. MOPB025Katalev, V.V. MOPB017Kato, R. MOPB025Kato, S. MOPB069Kaufmann, W. TUPB085Kawamata, H. THPB052Kawase, K. MOPB025Kayran, D. MOPB063, MOPB064Kazakov, S. TUPB053Kedzie, M. MOPB073, TUPLB07, TUPLB08, TUPB046, TUPB066, TUPB067, TUPB068Kelley, M.J. MOPB060Kellogg, S. TUPB081Kelly, M.P. MOPB073, TUPLB07, TUPLB08, TUPB046, TUPB066, TUPB067, TUPB068, TUPB093Kemp, M.A. WE2A02Kester, O.K. MOPB098Kewisch, J. MOPB064Khabiboulline, T.N. TUPB053Khaldi, M.E. MOPB013


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tho

rs

Khan, S. TUPLB03, TUPB003Khan, V.F. MOPB043Khare, P. THPLB05, THPB003Kijel, D. MO1A01Kim, D.G. THPB084Kim, D.I. TU1A05, THPB053Kim, E.-S. TUPLB06, TUPB028, TUPB030Kim, H.J. TUPB030, TUPB104Kim, H.S. TU1A05, THPB022, THPB053Kim, J.-W. TUPLB06, TUPB028, TUPB030, THPB084Kim, S.H. MOPB049Kim, S.-H. TUPB050Kim, S.K. TUPLB06, TUPB028, TUPB030King, L.K. MOPB030Kishek, R.A. THPLB11, THPB061Kitaguchi, M. MO3A04Klaus, M. MOPLB10, MOPB090Kleeb, T. TUPB009Klein, H. SUPB012, THPLB03, THPB005, THPB009, THPB047Knobloch, J. SUPB029, MOPB065, MOPB067, THPLB12, THPB066Kobayashi, T. THPB092, THPB088Kobayashi, Y. WE1A01Koeth, T.W. THPLB11, THPB061Kolomiets, A. SUPB016, THPLB06, THPB036, THPB050Kondo, C. MOPB005Kondo, K. THPB037Kondo, Y. THPB052Kondrashev, S.A. THPB063Konecny, R. MOPLB11, MOPB093Konoplev, I.V. TUPB086Konrad, M. SUPB010, TUPB026Koscielniak, S.R. MOPB026, MOPB033, WE1A04Kostin, D. MOPB012, TUPB019Koubek, B. SUPB014, SUPB017, THPB034, THPB046, THPB048, THPB049Kovalenko, A.D. THPLB06, THPB036Koveshnikov, A. MOPB091Kowina, P. TUPB085, THPB034Koyama, K. THPB095Kozsar, I. THPB010Krämer, A. THPB034Krafft, G.A. MOPB014Kramp, M. TUPB053Krasilnikov, M. MOPB015Krasnykh, A. MOPB087Kravchuk, L.V. MOPB082Kreisel, A. MO1A01Kreps, G. MOPB012Krzysik, K. MOPB012Kucera, M.J. MOPB054Kudou, T. THPB080Kugeler, O. SUPB029, MOPB065Kumar, M. TUPB033Kumar, R. TUPB033Kuramoto, A. MOPB025Kuriki, M. MOPB025Kusano, S. THPB080Kush, P.K. THPLB05, THPB003Kushnir, V.A. MOPB023Kutsaev, S.V. TUPLB08, TUPB046, TUPB067, TUPB087, TUPB093Kuzikov, S.V. THPB096Kwon, H.-J. TU1A05, THPB022, THPB053


Au

tho

rs

— L —

Laarmann, T. TUPLB03, TUPB003Lallement, J.-B. THPB011, THPB038, THPB010Langlois, S. THPLB09, THPB083Latina, A. THPB090Laxdal, A. MOPB026Laxdal, R.E. MOPB024, MOPB026, MOPB033, MOPB091Le Coz, W. TUPB029Le Noa, Y. THPB038Lebedev, V.A. THPB014, THPB018, THPB019Lechner, C. TUPLB03, TUPB003LeClair, R.W. MOPB087Ledu, G. TUPB029Lee, S.W. TUPB050Leibfritz, J.R. MOPB054Leitner, D. TU1A04, TUPB040Leitner, M. TU1A04, TUPB040Lempert, G. MO1A01Lenckowski, M. TUPB081Lepercq, P. MOPB013Lepoittevin, F. TUPB029Lettry, J. THPB010Levichev, A.E. SUPB009, MOPB048Li, A.H. TUPB103Li, C. SUPB013, TUPB038, TUPB039, THPB026Li, D. THPB027, THPB054Li, F. SUPB036, THPB082Li, J. MOPB010, THPLB01, THPB023Li, J.H. TUPB076Li, Q. MOPB010Li, X. MOPB022, THPB025Li, Y. MOPB010Li, Z. THPB024, THPB025, TUPB075Liang, X. MOPB064Lilje, L. MOPB017Lillestøl, R.L. MOPB009Limborg-Deprey, C. MOPB029, TUPB024Lin, L. THPB067Lindroos, M. TH2A01Lipkowitz, N. MOPLB01, MOPB001Litvinenko, V. MOPB034, MOPB063, MOPB064Liu, H.C. TUPB103, THPLB01, THPB023Liu, K.X. THPB067Liu, S.H. SUPB013, TUPB039, THPB026Liu, W. MOPLB11, MOPB093Liu, X.H. MOPB029, TUPB024Liu, Y. THPB039Liu, Z. TUPB058Lofnes, T. TUPB108Lombardi, A.M. THPB011, THPB038, THPB010Lopez Hernandez, L.A. THPB010Loret, S. TUPB029Lu, L. TUPB073Lu, P.N. TUPB034Luner, J. MO1A01Lunin, A. TUPB054, TUPB067Lurie, Yu. TUPB014

— M —

Ma, L.Z. THPB079Ma, Ma. TUPB076MacDonald, S.W.T. MOPB092


Au

tho

rs

Machicoane, G. TU1A04, THPB097, TUPB040Madec, C. THPLB09, THPB083Mäder, D. SUPB012, THPLB03, THPB005, THPB008, THPB009Maesaka, H. TUPB006Maglioni, C. THPB010Magome, T. THPB092Mahler, G.J. MOPB063, MOPB064Maidana, C.O. THPB090Maier, M.T. TUPB035Malabaila, M. MOPB075Malka, V. MO2A01Malloch, I.M. MOPB070, MOPB071Maltezopoulos, Th. TUPLB03, TUPB003Mandag, E.N. MOPB013Mandal, A. MOPB076Marchetto, M. MOPB024, FR1A04Marcos, J. THPB089Marhauser, F. MOPB030Marks, H. S. SUPB033, THPB093Marques Antunes Ferreira, L.MOPB075Marti, F. TU1A04, FR1A01, TUPB040Martínez de Alvaro, T. THPB089Maruta, T. MOPB094, TUPB082, TUPB101Mascali, D. THPB076, THPB077Massana, V. THPB089Matalevich, J. MOPB031Matheisen, A. MOPB017Mathot, S.J. THPB038, THPB010Mathuria, D.S. TUPB033Matsubara, S. TUPLB10, TUPB080Matsukawa, T. TUPLB10, TUPB080Matsumura, Y. THPB095Matveenko, A.N. SUPB003, SUPB004, MOPB036, MOPB037McCormick, D.J. MOPB029McIntosh, P.A. MOPLB08, MOPB004, MOPB079McIntyre, G.T. MOPB063, MOPB064McKenzie, J.W. MOPB011McMahan, C.J. TUPB050Meng, C. TUPB075, THPB024Mercier, B. MOPB013Merminga, L. MOPB024Merz, W. TUPB019Meusel, O. MO3A03, THPB008Michelato, P. MOPB017, TUPB020Michizono, S. SUPB024, TUPLB12, TUPB090, THPB088Mickat, S. SUPB023, MO3A01, TUPB072, TUPB074Middendorf, M.E. THPB087Middleman, K.J. MOPB004, MOPB011Midttun, O. THPB011Migne, J. MOPB074Mikulas, S. MOPB075Mikulec, B. THPB010Militsyn, B.L. MOPB011Miltchev, V. TUPLB03, TUPB003Minamide, H. TUPLB10, TUPB080Minato, M. TUPB081Minoru, M. TUPB102Mistri, K.K. TUPB049Mitra, A.K. MOPB033Mittag, F. TUPB019Mittenzwey, M. TUPLB03, TUPB003Miura, A. TUPB082, TUPB101, TUPB102


Au

tho

rs

Miyao, T. TUPB101, TUPB102Mizuno, A. THPB068, THPB092Möller, W.-D. MOPB012, MOPB017, MOPB058Molina Marinas, E. THPB089Molloy, S. SUPB018, TUPB048, TUPB052Monaco, L. TUPB020Monard, H. MOPB013Mondino, I. TUPB047Mondrel, M. MOPB091Monnereau, G. THPLB09, THPB083Montesinos, E. TUPB047Montoro, G. MOPB009Moody, N.A. TU3A03Morgan, G. THPB097Morgan, J.W. TUPLB07, TUPLB08, TUPB046, TUPB066, TUPB068Morishita, T. TUPB042, THPB052, TUPB100Morozov, V.S. MOPB014Morris, D. MOPLB10, MOPB090, TU1A04, TUPB040Mosnier, A. TU1A01Mostacci, A. MOPLB09, MOPB080Moya, I. THPB089Mühle, C. THPB034Muller, N. MOPB091Mundra, G. THPLB05, THPB003Murcek, P. THPB075Murokh, A.Y. MOPB019, MOPB050, TUPB088, THPB072Murphy, R.C. MOPB073, TUPLB07, TUPLB08, TUPB046, TUPB066Mustapha, B. TUPLB08, TUPB045, TUPB046, TUPB067, THPB063Mytrochenko, V.V. MOPB023

— N —

Nagaitsev, S. TU1A02, TUPB062Naik, V. MOPB024Naito, F. TUPB099, TUPB100, TUPB101, THPB020, THPB052Namkung, W. MOPB049Nanmo, K. TUPB099, TUPB100, TUPB101Nantista, C.D. TUPLB11, TUPB089Napoly, O. MOPB017, THPLB09, THPB083Nassiri, A. SUPB025, MOPB055Natsui, T. THPB095Nause, A. TUPLB05, TUPB005, SUPB011Neidherr, D. TUPB035Neilson, J. WE2A03Neri, L. THPB028Nesmiyan, I. MOPB027Neumann, A. MOPB066, MOPB067, THPLB12, THPB066, THPB069Neustadt, T.S. TUPB050Nezhevenko, O.A. MOPB054Ng, K.Y. TUPB021Ni, D.S. THPB079Nicklaus, D.J. MOPB054Nikolskiy, K.I. TUPB091Nisbet, D. THPB010Nölle, D. MOPB017Nolen, J.A. TU1A04Novo, J. THPB038

— O —

Ogawa, K. TUPLB10, TUPB080Oh, J.-S. MOPB049Ohshima, T. TUPB006


Au

tho

rs

Okamura, M. THPB037Okayasu, Y. TUPLB10, TUPB080Okuno, H. MO3A02, TUPB095Olave, R.G. MOPB072Olry, G. TUPB051, TUPB064Olvegård, M. MOPB009Onken, R. TUPB019Orlov, Y. TUPB053Orsini, F. MOPB074Orzhekhovskaya, A. TUPB035Ostiguy, J.-F. THPB014, THPB055Ostroumov, P.N. MOPB073, TUPLB07, TUPLB08, TUPB045, TUPB046, TUPB066, TUPB067, TUPB068,

TUPB087, THPB063Otake, Y. MOPB005, MOPB084, TU2A02, TUPB006Otani, K. MOPLB07, MOPB053Ottaway, S.W. TUPB050Ouchi, N. THPB020Ouyang, H.F. THPLB01, THPB023, THPB025Owada, S. TUPLB10, TUPB080Oweiss, R. MOPB070, MOPB071Ozelis, J.P. MOPB071, TU1A04, TUPB040

— P —

Pagani, C. TUPB020Palczewski, A.D. MOPB062Palladino, V.C. THPB057, THPB058Palmieri, A. TUPB094, THPLB08, THPB040, THPB041, THPB043Palumbo, L. MOPLB09, MOPB080Paly, L. TUPB009Pan, G. THPB039Pan, W. SUPB036, THPB082Pan, W.M. TU1A03Pande, S.A. THPB073Pandey, A. TUPB033Paoluzzi, M.M. THPB010Paparella, R. TUPB020Papke, K. MOPB067Paramonov, V.V. MOPB081, MOPB082, TUPLB02, TUPB001, TUPB002Park, B.-S. TU1A05Park, H. MOPB030Park, S.J. MOPB049Parma, V. MOPB075Paskvan, D.R. TUPLB08, TUPB046Pasquinelli, R.J. THPB019Pate, D. MOPB064Patra, P. TUPB033Pavlov, V.M. SUPB009, MOPB048Peauger, F. MOPB074Peggs, S. TUPB077Pei, G. MOPLB04, MOPB023, MOPB046Pei, S. MOPB006, MOPB022, MOPB023, THPB025Peng, J. TUPB103Peng, S. TU1A04, TUPB040Peng, S.X. TUPB034Penn, G. TUPB016Pepato, A. SUPB015, THPB042Perrin, J.L. THPLB09, THPB083Perry, A. TUPB087, MO1A01Petenev, Y. SUPB003, SUPB004, MOPB036, MOPB037Petersen, B. MOPB017Peterson, D.W. THPB019Pfingstner, J. SUPB007, MOPB042


Au

tho

rs

Pfister, J. THPB034Phillips, D. MOPB064Phillips, H.L. MOPB060Pierini, P. TUPB020Pietralla, N. SUPB010, TUPB026Pietryla, A.F. THPB087Pikin, A.I. TUPB105, THPB063Pilat, F.C. TH3A02Pinhasi, Y. TUPB014Piotrowski, A. TUPB019Piquet, O. THPB031, THPB038Pischalnikov, Y.M. MOPB077, MOPB054, TUPB062Pisent, A. THPB030, THPB041, THPB043Plastun, A.S. SUPB016, THPB050Plawski, E.P. MOPB017Plostinar, D.C. THPB004, THPB032Podlech, H. SUPB012, SUPB022, SUPB023, MO3A01, TUPB071, TUPB072, THPLB03, THPB005,

THPB007, THPB009, THPB047Poloubotko, V. TUPB053Polozov, S.M. SUPB035, TUPB031, TUPB070, THPB001, THPB074Ponton, A. THPB028, THPB029Popielarski, J. MOPLB10, MOPB070, MOPB090, TU1A04, TUPB060, TUPB040, MOPB071Popielarski, L. MOPB070, MOPB071, TU1A04, TUPB040Popovic, M. THPB016, THPB017Popovic, S. MOPB068Posocco, P.A. THPB011Pottin, B. THPB031Power, J.G. MOPLB11, MOPB093Powers, T. MOPB031Pozdeyev, E. TU1A04, THPB097, TUPB040Prakash, P.N. TUPB049Prat, E. TUPB013Preble, J.P. MOPB030Prenting, J. MOPB017Prevost, C. MOPB013Prieto, P.S. MOPB054Prior, C.R. THPB032Pronitchev, O. TUPB053Prosnitz, D. TUPB016Przygoda, K.P. TUPB019Ptitsyn, V. MOPB063Puccio, B. THPB010Pugnat, D. THPB038Puntambekar, A. THPLB05, THPB003

— Q —

Qiang, J. TUPB016Quan, S.W. THPB067

— R —

Raguin, J.-Y. TUPLB01, TUPB009, TUPB010, TUPB011, TUPB012Rai, A. TUPB033Raich, U. TUPB041, THPB010Rajaram, D. SUPB034, THPB059Ramberger, S. THPB010Rampnoux, E. TUPB064Rao, T. MOPB064Rao, X. THPB097Raparia, D. TUPB105, THPB051Rathke, J. MOPB064Ratzinger, U. SUPB012, SUPB022, SUPB023, MO3A01, TUPB071, TUPB072, THPLB03, THPB005,


THPB006, THPB007, THPB008, THPB009

Au

tho

rs

Raubenheimer, T.O. MOPB029, TU2A03Rawnsley, W.R. MOPB026, MOPB033, MOPB091, TUPB081Reece, C.E. MOPB030, MOPB031, MOPB060, MOPB061, MOPB062Rees, G.H. THPB032Rehders, M. TUPLB03, TUPB003Reichold, A. TUPB086Reid, J. MOPB054Reid, T. MOPB073, TUPLB07, TUPB066, TUPLB08, TUPB046Reilly, A.V. MOPB030, MOPB061Reinfeld, E. MO1A01Reinsch, M.W. TUPB016Ren, H.T. TUPB034Renaglia, T. MOPB075Repnow, R. TUPB035Reschke, D. MOPB012, MOPB017Reynet, D. TUPB064Riddone, G. MOPB027Riemann, B. MOPB066, MOPB067Rimmer, R.A. MOPB030Roblin, Y. MOPB014Rodnizki, J. MO1A01, FR1A05Rönsch-Schulenburg, J. TUPLB03, TUPB003Romanenko, A. SUPB030, MOPB078Romanov, G.V. THPB054, THPB055Roncarolo, F. TUPB041Roncolato, C. TUPB032Roper, M.D. MOPB011Rose, J. MOPB040Rosenzweig, J.B. THPB072Roßbach, J. TUPLB03, TUPB003Rossi, C. THPB038, THPB010Roudier, D. THPLB09, THPB083Roux, R. MOPB013Rowe, A.M. SUPB030, MOPB078Roy, A. TUPB049, TH1A04, TUPB033Roy, S.B. THPLB05, THPB003Ruber, R.J.M.Y. TUPB108, TUPB107Ruelas, M. TUPB088Ruiz-Osés, M. MOPB064Russo, T. TU1A04, TUPB040Rydberg, A. TUPB108Ryu, J.Y. TU1A05, THPB022

— S —

Sacepe, N. THPLB09, THPB083Sacharias, J. TUPB049Saeki, T. MOPB069Safikanov, P.R. THPB001Saha, S. MOPB076Sahu, B.K. TUPB033Saini, A. THPB014Saito, K. MOPLB10, MOPB070, MOPB071, MOPB090, TU1A04, TUPB060, TUPB040Sakabe, S. MOPLB07, MOPB053Sakamoto, N. MO3A02, TUPB073, TUPB095Sakaue, K. MOPB025Sako, H. TUPB082Sakurai, T. MOPB005, MOPB084Samoshin, A.V. MOPB099, TUPB069, TUPB070Sanchez, L. MOPB009, THPB089Santiago Kern, R. TUPB108Sanz, S. THPB089


Sarid, E. FR2A02

Au

tho

rs

Sato, F. THPB088Sato, T. TUPLB10, TUPB080Satoh, M. THPB080Sauce, Y. THPLB09, THPB083Saunders, J. TUPB050Savard, G. FR1A03Savilov, A.V. THPB096Scantamburlo, F. SUPB015, THPB042Schappert, W. MOPB077, MOPB054, TUPB062Schempp, A. SUPB014, SUPB017, THPLB03, THPB005, THPB007, THPB008, THPB046, THPB047,

THPB048, THPB049, THPB034Scherer, A. TUPLB01, TUPB010Schietinger, T. TUPB013Schirm, K.M. MOPB075, TUPB047Schlarb, H. MOPB017, TU3A01, TUPLB03, THPB085, THPB086, TUPB003Schlitt, B. MO3A01Schmidt, Ch. THPB085, THPB086Schmidt, J.S. SUPB014, SUPB017, THPB046, THPB048, THPB049Schoessow, P. MOPLB05, MOPB047Schrage, D.L. TUPLB08, TUPB046Schreiber, G. THPLB07, THPB035, THPB034Schreiber, S. TUPLB03, TUPB003Schroedter, L. TUPLB03, TUPB003Schulte, D. SUPB007, SUPB008, MOPB042, MOPB045Schultheiss, T. MOPB064Schwarz, M. THPB008Schwerg, N. MOPB075, THPB010Scrivens, R. THPB011, THPB010Seberg, S.K. MOPB064Seda, T. MOPB064Sekine, M. THPB037Sekutowicz, J.K. MOPB017, TUPB019, THPB069Seletskiy, S. MOPB040Seol, K.T. TU1A05, THPB022, THPB053Serpico, C. MOPB083Sertore, D. TUPB020Sessler, A. TUPB016Seth, S. MOPB076Setty, A.S. THPB064Seviour, R. TUPB077, TU3A02Shaftan, T.V. MOPB040Shanks, R.W. MOPB033Sharamentov, S.I. THPB045, TUPLB08, TUPB046Shebolaev, I.V. SUPB009, MOPB048Sheehy, B. MOPB064Shemyakin, A.V. MOPB095, THPB019Shen, G. MOPB040Shen, Y. MOPB008, THPLB04, THPB002Shepard, K.W. TUPLB08, TUPB046, TUPB068, TUPB067Shepherd, B.J.A. MOPB011Sheppard, J. MOPLB01, MOPB001Shi, A. TUPB036, THPB039Shi, J. MOPB008, MOPB010, THPLB04, THPB002Shimel, G. MO1A01Shimizu, H.M. MO3A04Shinozaki, S. THPB088Shoji, Y. MOPB038Shor, A. MO1A01, THPB094Shrivastava, P. THPLB05, THPB003Silverman, I. MO1A01Simon, C.S. TUPB085, THPLB09, THPB083


Au

tho

rs

Singer, W. MOPB017, MOPB058Singer, X. MOPB058Skaritka, J. MOPB064Skowronski, P. MOPB003, MOPB009Smirnov, A.Yu. TUPB023, TUPB091Smirnov, V.L. THPB097Smith, K.S. MOPB064Smith, R.J. MOPB004, MOPB011Sobenin, N.P. TUPB023Socol, Y. MOPB051Solyak, N. MOPB077, TUPB062, THPB014, THPB055Som, S.S. MOPB076Song, Y.-G. TU1A05, THPB022Sonti, S.S. TUPB049Soskov, V. MOPB013Spataro, B. MOPLB09, MOPB080, MOPB085Srivastava, S. MOPB032Stanford, G. MOPB091Staples, J.W. THPB054Stephan, F. MOPB015Sterbini, G. MOPB009Stewart, S.E. TUPB050Storey, D.W. MOPB026, TUPB081Storms, S. MOPB019, MOPB050Stovall, J. THPB097Strong, W.H. TUPB050Suda, K. MO3A02, TUPB073, TUPB095Sugimura, T. THPB052Sukhanov, A.I. TUPB054Sulimov, A.A. MOPB012Suman, S.K. TUPB033Sun, B. TUPB075Sun, D. THPB019Sun, L.P. TUPB036, THPB039Sun, L.T. THPB097Sun, Y.-E. TU3A04Suwada, T. THPB080Suzuki, S. TUPLB09, TUPB079, THPB092Syratchev, I. WE2A01Szewinski, J. TUPB019

— T —

Takahashi, E. TUPLB10, TUPB080Takahashi, K. THPB037Takahashi, S. TUPB006Takata, K. THPB020Takeda, K. MOPB038Tamura, J. THPB020, THPB021Tanaka, H. TUPB099Tang, C.-X. MOPLB12, MOPB089Tang, J.Y. TUPB075, THPB024, THPB025Taniuchi, T. THPB068, THPB092Tanke, E. THPB065Tantawi, S.G. MOPB085Tardy, T. MOPB075Tarkeshian, R. TUPLB03, TUPB003Tecker, F. MOPB032, MOPB009Teichert, J. THPB075Than, R. MOPB063, MOPB064Therasse, M. TUPB047Tian, H. MOPB062Tian, J.M. SUPB036, THPB082


Au

tho

rs

Tiede, R. SUPB023, TUPB072, THPLB03, THPB005Tikhoplav, R. TUPB088Timmins, M.A. THPB038Tischer, M. TUPLB03, TUPB003Todd, A.M.M. MOPB064Togashi, T. TUPLB10, TUPB080Togawa, K. TUPB006Tokita, S. MOPLB07, MOPB053Tomizawa, H. THPB068, TUPLB10, TUPB080Tong, D.C. SUPB031, MOPB086Tongu, H. SUPB024, MOPLB07, MOPB053, TUPLB12, TUPB090Toral, F. MOPB009, MOPB017, THPB089Trueller, J. THPB034Tuozzolo, J.E. MOPB063, MOPB064Tuske, O. THPB078, FR1A02Tyagi, P.V. MOPB069

— U —

Uesaka, M. THPB095Upadhyay, J. MOPB068Urakawa, J. MOPB025Uriot, D. THPB033Usher, N.R. MOPLB10, MOPB090

— V —

Vacher, T.V. THPLB09, THPB083Valizadeh, R. MOPB011Valuch, D. TUPB047Valverde Alonso, N. MOPB075van Rienen, U. MOPB067Vande Crean, A. MOPB075Vandeplassche, D. THPB033Vandoni, G. THPB010, THPB038Vandygriff, D.M. TUPB050Varghese, P. MOPB054, THPLB02, THPB015Variola, A. MOPB013Venturini, M. TUPB016Venturini Delsolaro, W. TUPB047Verzilov, V.A. MOPB026, TUPB081Vinzenz, W. MO3A01, THPLB07, THPB035, THPB034Virostek, S.P. THPB054Visentin, B. MOPB017, THPLB09, THPB083Vlieks, A.E. MOPB029Völker, J. THPB069Vogel, E. MOPB017, TUPB020Vogel, V. TUPLB04, TUPB004Vogt, J.M. SUPB029, MOPB065Volk, K. THPB007Vollaire, J. THPB010Vormann, H. THPLB07, THPB035, TUPB035Vorobjev, G. TUPB035Vorozhtsov, S.B. THPB097Vossberg, M. THPLB03, THPB005, THPB047Vretenar, M. THPB010, THPB038Vuitton, VC. TUPB041Vuškovic, L. MOPB068

— W —

Waldschmidt, G.J. SUPB025, MOPB055Walla, M. THPB085Walz, D.R. MOPB029


Au

tho

rs

Wang, B.L. MOPB022Wang, C.P. SUPB032, TUPB097Wang, D. THPB065Wang, E. MOPB064Wang, F. THPB067, MOPB029, TUPLB11, TUPB089Wang, G.B. TUPB076Wang, G.M. MOPB040Wang, H. SUPB027, MOPB030, MOPB057Wang, R.X. SUPB027, MOPB057Wang, S.H. MOPB023Wang, W.D. MOPB008, THPLB04, THPB002Wang, Z.J. SUPB013, TUPB038, TUPB039, THPB026, THPB027, THPB079Watanabe, K. MOPLB07, MOPB025, MOPB053Watanabe, Y. TUPB095Weathersby, S.P. MOPB029Webber, R.C. TU1A04, TUPB040Wedberg, R. TUPB108Wei, J. TU1A04, TUPB058, TUPB060, TUPB061, TUPB040Weis, T. MOPB066, MOPB067Weise, H. MOPB017Weisend, J. MOPLB10, MOPB090, TUPB040Weissman, L. MO1A01, THPB094Weisz, S. THPB010Wen, L. MOPB008Wheelhouse, A.E. MOPLB08, MOPB011, MOPB079White, C.J. MOPB004White, G.R. MOPLB01, MOPB001Wieland, M. TUPLB03, TUPB003Wienands, U. MOPLB01, MOPB001Willeke, F.J. MOPB040Williams, L.R. TUPB047Williams, M. TU1A04, TUPB040Wiseman, M. MOPB031, MOPB030Wisniewski, E.E. MOPLB11, MOPB093Wittmer, W. THPB065Wlodarczak, J. MOPLB10, MOPB090Wong, M. SUPB030, MOPB078Woodley, M. MOPLB01, MOPB001Wu, B.M. THPB079Wu, G. SUPB025, MOPB055Wu, J.X. THPB027Wu, Q. MOPB064Wu, W. THPB079Wu, X. THPB065Wuensch, W. MOPB027Wurtele, J.S. TUPB016

— X —

Xia, L.S. MOPB008, THPLB04, THPB002Xiang, R. THPB075Xiao, B. MOPB060, MOPB060Xiao, C. MOPB098Xiao, S. SUPB037, THPB081Xiao, Y.C. TUPB103Xie, H.M. THPB067Xin, T. MOPB064Xu, C. SUPB001, MOPB018Xu, M.X. SUPB028, MOPB059, TUPB055Xu, T. TUPB050Xu, T.G. SUPB037, THPB081Xu, W. MOPB063, MOPB064Xu, Y. TUPB060, TUPB034


Xu, Z. THPB027

Au

tho

rs

— Y —

Yakovlev, V.P. MO1A03, TUPB053, TUPB054, TUPB067Yamada, K. MO3A02, TUPB073, TUPB095Yamamoto, A. TH3A01Yamamoto, T. THPB037Yamamoto, Y. MOPLB07, MOPB053Yamazaki, Y. TU1A04, TUPB040Yan, F. TUPB075, THPB024, MOPB024Yan, L.X. MOPLB12, MOPB089Yanagida, K. TUPLB09, TUPB079, THPB092Yang, A.M. MOPB008Yang, H.R. MOPB049Yang, W.J. THPB079Yang, X. MOPB040Yang, X.L. THPB079Yang, Y.Z. SUPB027, MOPB057Yaramyshev, S.G. TUPB035Yeremian, A.D. MOPB085Yin, X. TUPB103, THPLB01, THPB023Yocky, G. MOPLB01, MOPB001Yogi, R.A. TUPB107, TUPB108Yoshida, M. THPB095Yoshioka, T. MO3A04Young, L.M. THPB097Yuan, Y.J. TUPB038Yue, W.M. SUPB027, MOPB057, TUPB055Yun, S.P. TU1A05Yusof, Z.M. MOPLB11, MOPB093

— Z —

Zaltsman, A. MOPB063, MOPB064Zaplatin, E.N. MOPB074, THPLB12, THPB066Zelinsky, A.Y. MOPB006, MOPB023Zeller, A. TU1A04Zemach, E. MO1A01Zeng, L. SUPB036, SUPB037, THPB081, THPB082Zennaro, R. TUPB009Zhang, B. MOPB088, TUPB055, THPB027, THPB039Zhang, C. SUPB012, THPLB03, THPB005, THPB009, SUPB019, SUPB020, SUPB027, MOPB057,

TUPB055, TUPB056, TUPB057Zhang, H. MOPB008, THPLB04, THPB002Zhang, J.R. MOPB022, THPB025Zhang, K. MOPB008, MOPB010Zhang, L.W. MOPB008, MOPB010, THPLB04, THPB002Zhang, M. SUPB006, MOPB007, TUPB018, TUPB022Zhang, S.H. SUPB027, MOPB057, TUPB055, THPB027Zhang, S.X. SUPB027, MOPB057Zhang, X.H. TUPB043Zhang, Y. TU1A04, TUPB058, TUPB060, TUPB061, TUPB040Zhang, Z. MOPLB12, MOPB089Zhang, Z.L. TUPB036, THPB039Zhao, H.W. SUPB027, MOPB057, TUPB038, TUPB055, THPB027, THPB039Zhao, J. TUPB034Zhao, K. THPB067Zhao, M.H. SUPB006, TUPB018, TUPB022Zhao, Q. TU1A04, TUPB040, THPB097Zhao, Z.T. SUPB031, MOPB086Zheng, Z. TUPB060, TUPB061, TUPB058, TUPB060, TUPB061Zholents, A. TUPB008


Au

tho

rs

Zhou, Z.S. MOPB023Zhu, F. THPB067Zhu, J. MOPB010, THPLB04, THPB002Zhukov, A.P. THPB012Zickler, Th. THPB010Ziemann, V.G. TUPB107, TUPB108Zimmermann, F. TH3A03Zinkann, G.P. TUPLB08, TUPB046Znidarcic, M. TUPB085Zocca, F. TUPB041Zvyagintsev, V. MOPB091


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