Richard Pardo Argonne National Laboratory ATLAS Operations ATLAS User’s Meeting August 14, 2009.

Richard Pardo

Argonne National Laboratory

ATLAS Operations

ATLAS User’s Meeting August 14, 2009

August 14, 2009 ATLAS User’s Meeting: ATLAS Operations R. Pardo 2

Outline

ATLAS Operations Facility Current Status and Performance

– Operating statistics

– Beams available and properties

– Operations schedule and staff Recent and In-Progress Improvements

– In-flight RF Sweeper

– Energy Upgrade Project

– CARIBU will be discussed in separate presentation Future Accelerator Facility Improvements

– ARRA AIP-funded projects

– Proposed ATLAS Efficiency and Intensity Upgrade (separate presentations)


ATLAS: A National User Facility for Low-Energy Heavy-Ion Research

World’s First Superconducting Accelerator for Ions

1 ECR Ion Source on HV platform

In-Flight RI Beam Production Gas Cell

Energy Upgrade Cryostat

CARIBU

HELIOS


ATLAS Delivered Beams for FY2008

34 Different Isotopes*11.6%(650 hours) of beam time for Exotic Beams


ATLAS Standard Stable BeamsStable Beams Available from ATLAS

Beam currents listed in the table were obtained with naturally occurring material for the given isotope. The maximum energy quoted corresponds to that computed with the optimal charge state. Higher energies are possible by using another charge state or by double stripping. a Other isotopes available with currents proportional to their abundance. For more beam current, isotopically enriched material may be used, but the User should, in general, contact the User Liaison or ATLAS Operations to check on the availability of enriched material. b Indicates elements for which isotopically enriched material has been successfully used in the past. c Allowed maximum radiation may limit beam current. * The maximum energies in Area II are about 0.6 times these values.

Iona Maximum Energy (Mev)

for Areas III,IV*

Maximum Current at Maximum Energy

(pna)

Beam Current at Energy of 6 MeV/u

(pnA) 7Li 140 >100c 200c

10Bb,c 200 >100 >100 12Cb 241 100 >1000c 14N 244 800c >1000c 16Ob 320 >100 >1000c 19F 334 10 50 20Ne 350 1000 >1000c 24Mg 415 2 10 27Al 464 10 30 28Sib 476 100 >1000 32Sb 539 100 1000 35Cl 585 12 35 40Arb 660 1000 >1000 40Cab 660 200 >1000 48Tib 778 40 300 51V 816 0.5 2 52Cr 832 10 40 56Feb 882 50 400 59Co 920 10 50 58Nib 911 20 100 63Cu 977 20 100 64Zn 979 4 20 74Geb 1103 2 10 80Se 1160 2 10 79Br 1150 2 10 84Krb 1201 500 >1000 90Zrb 1260 140 300 98Mob 1343 1.5 7 102Rub 1377 3 12 107Ag 1418 10 50 120Snb 1512 2 10

The list of ‘standard beams’ has been recently updated on the ATLAS website. The data now listed reflects:

1. New Energy Upgrade Cryostat

2. Continued improvements in source performance and transmission.

3. If your experiment needs a different beam or better performance, contact me.


Rare Isotope Beams at ATLAS

ATLAS History of In-flight Radioactive Beams

IN FY2008

– In-Flight Radioactive Beams: 11.6% of beam time (650 hours)


ATLAS Radioactive Beams Provided

Radioactive Beams Delivered by ATLAS Ion

Half Life Reaction Intensity (ions/sec/p

nA)

Opening Angle

(degrees)

Production Energy (MeV)

Max. Rate

(ions/sec) 6Hea,c 0.81 sec d(7Li,6He)3He 150 19 75 1 x 104 8Lia,c 0.4 sec d(7Li,8B)p 2000 11 71 1.5 x 105

8Ba,c,d 0.77 sec 3He(6Li,8B)n 10 13 27 11Ca,c 20.39 min p(11B,11C)n 2300 4.5 105 2 x 105 12Ba 20.20 ms d(11B,12B)p 2000 7.45 70 2 x 105 14Oa 70.61 sec p(14N,14O)n 1200 2.9 170 16Na 7.13 sec d(15N,16N)p 30000 5.4 70 3 x 106

17Fa 64.49 sec d(16O,17F)n p(17O,17F)n

20000 20000

4.5 1.7

~90 2 x 106

20Naa,d 0.45 sec 3He(19F,20Na)2n ~1 148

21Naa 22.48 sec d(20Ne,21Na)n p(21Ne,21Ne)n

4000 8000

4.0 2.6

113 2 x 106

25Ala 7.18 sec d(24Mg,25Al)n p(25Mg,25Al)n

1000 2000

3.7 2.2

204 180

33Cla 2.5 sec d(32S,33Cl)n 1000 2.5 250 5 x 104 37Ka 1.23 sec d(36Ar,37K)n 1200 2.2 280 18Fb 109.77 min 6 x 106

44Tib 59 yr 5 x 105

56Nib 6.1 d 5 x 104

56Cob 77.1 d 2 x 105

a Beams produced using the "In-flight" method. b Beams produced using the "Two-accelerator" or "Batch" method. c Allowed maximum radiation may limit beam current. d Used so far for implantation only.

The list of ‘radioactive beams’ developed so far by the ‘in-flight’ or ‘batch’ method is also listed on the ATLAS website.

These beams have been developed for the spectrograph beamline so far.

Development of beams to HELIOS is now possible. 12B has been provided to HELIOS for research so far.

No RF sweeper is available for HELIOS at this time to improve beam purity.


Statistics of ATLAS Performance

•6-day operation resumed in February, 2008.

• 7-day operation started in the week of July 6.– For FY09, we now project ~5100 Joule hours. – CARIBU and Energy Upgrade commissioning reduce research time.

• CARIBU operation will allow two parallel experiments for first time

• A new measure of performance provided by users indicate 91% availability compared to schedule research hours.

† Joule operating hours = Research + Accel. Devel. + Tuning


Measures of ATLAS Performance

Facility Time Distribution

In FY2008

• 56% of calendar time for research/beam studies

• 77% of staffed hours for research

• 5% of available time is Research Downtime


ATLAS System Reliability Maintenance is vital to successful operation

High reliability → maximum research hours 329 hours of lost research time in FY2008

Tracking failures focuses our maintenance and development efforts Replacement/upgrade of aging systems maintains operating reliability.

Specific Maintenance & Improvement Programs

• Replaced all RF Amplifiers (3 years)

• Replaced Shift Log software with new system

• Installed new electronic bulletin board

• Start replacement of bipolar steering magnet power supplies


ATLAS Staff Levels

ATLAS now has 6 trained operator and– Lead Operator– Operations Supervisor

The ATLAS Operations staff now totals 23 persons

– Plus support from the Accelerator Development group (6) In addition there are 9.5 FTEs spread over 12 people providing

support to the ATLAS research program. For most of 2008, ATLAS operated on a 6-day schedule (with

occasional seven-day operation as required by experiment needs).

The FY09 final budget allowed ATLAS to return to 7-day operation.

Seven day operation began in July 2009. Two new CARIBU positions added for beam development/operation

– Dedicated technician (not yet filled)– Post-doc


Priorities for Upgrades & DevelopmentsOur overarching goal is to maintain ATLAS as the nation’s premier

low-energy heavy-ion research facility. CARIBU will greatly expand our RIB capabilities.

– Emphasizes need for improved total efficiency (ATLAS Intensity Upgrade)– Increased beam energy for inverse reaction studies (Energy Upgrade)– Better diagnostics (AIP LEBT improvements this year)

In-flight radioactive beams with properties not readily available at other facilities (energy, yield, beam quality) (RF Chopper)

Stable beams will continue to play an important role – Increased beam intensity – often with expensive, low-abundance isotopes.– 50Ti @ >300 pnA on target– Reduce source contamination with solids for AMS studies – (Laser ablation of solid materials into ECR & other source improvements)

Developments at ATLAS seek to improve performance in these areas, enhancing the features most in demand.


ATLAS In-flight Radioactive Beam ProductionRF Chopper to remove primary beam tails

• First operation in February 2008.• Now available for ‘routine’ operation.• Second unit for HELIOS under consideration.

FocusingQuadrupole Focusing

Quadrupole

22o bending magnet

Secondary targetArea III

Spectrograph

RF Chopper

10C In-flight Production from 10B Primary Beam @120MeV

E-residual Chopper Off E-residual Chopper On

10C6+

10B5+

10B4+9Be4+

B/C Discrimination factor ~ 200


ATLAS Energy Upgrade Project is Online

New ATLAS Cryostat

109 MHz QWR Cavity

ßs = 0.144Length = 25cm

ATLAS Energy Upgrade replaces the last ATLAS cryostat with:

New cryostat containingNew classes of resonators: 7 ß=0.14 quarter-wave resonators

A No Strip Strip No Strip Strip16 13.0 15.7 18.5 21.540 12.4 13.4 17.5 19.958 9.9 11.8 13.5 17.978 9.5 11.2 12.8 16.7132 8.0 9.3 10.4 13.4197 6.6 7.9 8.4 10.9238 6.4 7.4 7.9 10.0

Current ATLAS ATLAS Upgrade

Off-lineTest


ATLAS Energy Upgrade Project Installation• ATLAS high energy beamline

reconfigured in March 2009.

• First offline resonator tests May 2009.

Fields as high as 15 MV/m

• Cryostat installed in beamline, Week of May 25, 2009. Photo Album

• First beam acceleration at low fields July 2, 2009.

• Full operation : July 21-24, 2009. 12C beam to 241.5 (20.1MeV/u) Average accelerating field: 8.3 MV/m

• Need split-ring resonator repair 5 Split-ring resonators not operating

limit total energy. Repairs for some in January 2010.


New projects to enhance ATLAS capabilitiesAccelerator Improvement Projects (AIP)

PII & CARIBU LEBT Improvements - $200k (FY2009)– Additional beam diagnostics – emittance.– Additional weak beam diagnostics – tape station.– CARIBU beamlines to the CPT and laser atom trap facility– Later: Electrostatic Optics (mass independent) design.

ECR Laser Ablation for AMS and Solids - $970k (FY2010-12)– Funding: New 3-year ARRA Actinide AMS proposal– Improved efficiency and intensity of ECRIS with solids.– Important for rare stable isotopic materials – Accelerator Mass Spectroscopy – reduce sample cross-talk– Builds on past experience with lower power NdYAG laser.

ARRA AIPs : First Phase of Energy & Intensity Upgrade– $9800k for FY2009-12 in two projects– a) New RFQ Linac replaces the first PII cryostat– b) New λ/4 resonators and new cryostat to upgrade booster linac and improved helium plumbing for cryostat


ARRA AIP projects to enhance ATLAS capabilities FY2010/2011/2012 AIP Improvements

New PII RFQ Replaces First(α) PII Cryostat - First three resonators in PII have poor capture of beam- Approximately 1/3 of beam lost at this stage- By far, largest single loss point in facility- Important CARIBU beam improvement - Also better for high intensity stable beams- Funding:

ARRA AIP $4550k- An important first step in the overall ATLAS Energy & Intensity Upgrade


Other AIP projects to enhance ATLAS capabilities FY2010/2011/2012 AIP Improvements

Replace First Booster Cryostat & Helium Plumbing - Replace at leastoneexisting low-beta split-ring resonator cryostat with new, top-loading box cryostat design- Improved resonator cooling → Improved field performance- Cleaner resonator surfaces → Improved field performance- New ß=0.07 resonator required- Improved cryo insulation - New helium distribution system for new cryostat- Funding:

ARRA AIP funds of $5320k- A second step in the overall ATLAS Energy & Intensity Upgrade


Equipment Schedule & Funding

2006

2007

2008

2009

2010

2011

2012

2013

CARIBU

PII RFQ

AIP Funding

PII & CARIBU LEBT/ Diag.

Laser Ablatio

n(AMS-

funded)

ARRA Funding

Booster Cryostat Replacement

EBIS Charge Breeder (funding

not certain)

SRF Test

Facility


Summary

• ATLAS continues to perform at a high level of productivity• Some loss in research time this year and next required for installation and commissioning of Energy Upgrade Cryostat and CARIBU

• Current budget has allowed:• ATLAS to return to seven-day operation in July• Add staff to focus on CARIBU and electronics development activities

• Energy Upgrade Project Cryostat is now fully operational

• CARIBU commissioning will take place near the end of summer

• ARRA Funds allow the start of a major efficiency and intensity upgrade.

Richard Pardo Argonne National Laboratory ATLAS Operations ATLAS User’s Meeting August 14, 2009.

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Transcript of Richard Pardo Argonne National Laboratory ATLAS Operations ATLAS User’s Meeting August 14, 2009.