CTC, Outcome from Two-beam Module Review on15/16.09.2009 G. Riddone, 20.10.2009.

CTC, Outcome from Two-beam Module Review on15/16.09.2009

G. Riddone, 20.10.2009

Content

Aim and program of the module

review

Module design

baseline as validated in the module review on

15/16-09-2009

alternatives under study

Test program

CLIC modules

CLEX modules

G. Riddone, CTC meeting, 20.10.2009

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AIM AND PRGRAM OF THE REVIEW


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Aim of the reviewThe aim of the CLIC Two-Beam Module review is the following: Present the module baseline for the CDR and few selected

alternatives Review the baseline design for the module

technical design of the different systems, their integration, strategy for transport and installation

Consider alternative design for selected technical systems Update baseline and alternatives, if necessary

Review R&D and engineering efforts for the completion of the CDR

Update workplan, milestones, cost estimate, manpower requirements


4

Program Introduction

Main requirements (beam physics and RF) Technical systems (focus on baseline and show

alternatives) Integration (module and impact on tunnel) Validation (mock-ups and test modules) Cost issues

Conclusions and future actions


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Meeting over two days 15-16 September 2009Report of results at the CLIC workshop and CTC

Program on 15 September 2009Time Title Speakers

08:45-09:00

Welcome and presentation of the agenda

G. Riddone

09:00-09:20

Introduction. Charge for CDR H. Schmickler

09:30-09:50

Introduction. Introduction to module layout and types

G. Riddone

10:30-10:50

Main requirements. Beam dynamics requirements

D. Schulte

11:00-11:20

Main requirements. RF system reqiorements

W. Wuensch

11:30-11:50

Technical systems. Pre-alignment systems H. Mainaud Durand

12:00-12:20

Technical systems. Stabilisation system K. Artoos

14:00-14:20

Technical systems. Supporting system for structure

R. Nousiainen

14:30-14:50

Technical systems. Cooling system R. Nousiainen

15:00-15:20

Technical systems. Vacuum system and interconnections

C. Garion

16:00-16:20

Technical systems. Instrumentation and diagnostics. Beam instrumentation

L. Soby

16:30-16:50

Technical systems. Instrumentation and diagnostics. RF instrumentation

A. Andersson

17:00-17:20

Technical systems. Radiation issues S. Mallows


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Program on 16 September 2009


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Time Title Speakers

08:45-09:00

Presentation of the agenda G. Riddone

09:00-09:20

Technical systems. Magnet system M. Modena

09:30-09:50

Technical systems. Actuators for main beam feedback

H. Schmickler

10:30-10:50

Integration, validation and cost. System integration in the module

A. Samoshkin

11:00-11:20

Integration, validation and cost. Impact on tunnel integration. Introduction to the tunnel cross-section

J. Osborne

11:30-11:50

Integration, validation and cost. Impact on tunnel integration. Cooling and ventilation systems

M. Nonis

12:00-12:20

Integration, validation and cost. Impact on tunnel integration. Transport studies

K. Kershaw

14:00-15:00

Integration, validation and cost. Test modules: hardware, program, resources, schedule

G. Riddone

16:00-16:20

Integration, validation and cost. Cost issues Ph. Lebrun

16:30-16:50

Conclusions and future actions. Conclusions All

17:00-17:20

Conclusions and future actions. Future actions

All

MODULE DESIGN:BASELINE AND ALTERNATIVES


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9 G. Riddone, CTC meeting, 20.10.2009

Module layout

RF structures


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Accelerating structure: CLIC G, disks, waveguide damping sealed (100 mV/m, L = 230 mm, aperture ~ 5 mm)

PETS, octants. mini-tank (6.5 MV/m, L=310 mm, aperture 23 mm)

1 PETS powering 2 accelerating structures1 wake-field monitor per ac. structure

Water cooling

Vacuum manifold around each waveguide

PETS on-off

Water cooling for couplers only

Mini-tank for octants

Beam height and interaxis


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Beam interaxis: 650 mm same height for the two beams (to be reconsidered after CDR)

Beam height: 620 mm (agreement also from stabilisation WG)

650 mm

Pre-alignment system/ girders


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Accelerating structures and PETS + DB Q on girders Girder end supports cradles mechanically

attached to a girder and linked by rods to the adjacent one: snake-system with articulation points adopted (DB: 100 A, MB: minimization of wakefields, validation at 30 GHz in CTF2)

Separate girders for main and drive beam possibility to align DB quadrupole separate from accelerating structures Alternative under study: mono-

girder+ better stability, simplification for transport and installation- non-independent alignment MB and DB (is separate align. needed?)- additional weight for movers (cam system, are we ready?)

Support for MBQ - BPM


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Separate support for MB Q and its BPM snake system interrupted at each MB quadrupole

MB Q and BPM rigidly mechanically connected

No full continuity between MB girders (increasing of align. cost)MB girder length changes as function of module type No girder underneath MB Q Beam height loweredMBQ support simplified

MB Q beam pipe and AS beam pipe are coupled via bellows

Module sections

0

1

2

3

4

840 845 850 855 860 865 870

0

1

2

3

4

5010 5020 5030 5040 5050 5060 5070 5080

0

1

2

3

4

20090 20100 20110 20120 20130 20140 20150

Close to IP better alignment

IP


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With MB quad

Beam-Based Feedback


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Common actuators/devices for stabilization and beam-based feedback systems extend dynamic range of stabilization actuators by 100 ! and

make BBF corrections by displacing the MB quads.Fullscale = ± 5 um compared to ± 50 nm (several drawbacks)

original configuration additional windings onto quad jokes in order to produce “a sort of dipole correction field”

MB quad: solid yoke, not possible to insert correct coils (bandwidth problems)

New proposed configuration: use electromagnetic correction coils for RT trajectory correction: 1 cm long 0.1 - 0.4 T magnet at each MB quad (feasibility under evaluation)

Interconnections


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MB: gap is accepted (damping is needed for the long range wake)

DB: electrical continuity is required (100 A) MB-DB: choke mode flanges (flexibility needed during

thermal transient and alignment)

DBMB

Others


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Vacuum design based on 10-8 mbar requirement

Cooling Water cooling for RF structures and quadrupoles Air cooling for quadrupole cables (powering strategy)

Instrumentation BPM: 1 per Q WFM: 1 per ac. Structure Breakdown monitors (1 per PETS unit?) – how is it done?

Problem of radiation hardness


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TEST PROGRAM


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Motivation for Test Modules


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One of the feasibility issues is the two beam accelerating (two beam module is part of the program)

Address feasibility issues in an integrated approach e.g. RF structures, stabilization-alignment-supporting

systems

Establish coherence between existing test set-up up to future test modules in CLEX

Validate technical systems (tests in the labs) - if possible use components from stand-alone tests for test modules in CLEX

Validate two-beam acceleration scheme (tests in CLEX with beam)

Test modules


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CLIC modules(as much as possible

close to CLIC modules)

CLEX test modules (Eucard – NCLinac –WP9.2/9.3) (to be adapted to test infrastructures)

We have to establish a test program with clear

milestones before and after CDR

TEST MODULESone project with two parallel lines

Strategy for main linac two-beam module validation


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Objectives of the CLIC modules


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Integration of all technical systems (dummy RF structures and quadrupoles can be used – real dead weight and interfaces to other systems)

Full metrology Pre-alignment of MB and DB, including fiducialisation Interconnections validation under different simulated thermal

loads Stabilisation of main beam quad in the module environment Vibration study of all systems and identification of vibration

sources Measurement of resonant frequencies Heating in several thermal cycles. Measurements of thermal

transient e.g. how long it takes to achieve a new equilibrium state.

Transport of the module and verification of alignment

CLIC modules (LAB)


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Phase 1

Phase 2

Phase 3

Pre-alignment validation with dummy elements Interconnections - pumping (static conditions) Repositioning Measurements of resonant frequenciesTransport and thermal cyclesMeasurements of resonant frequencies

Stabilization (Q) and pre-alignment compatibilityVibration study of all system and vibration sources

The test module types 0-1-4 are representative of all module types

014 CLIC modules


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Type 0

Type 1

Type 4

A. Samoshkin

Objectives of the test modules


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Two-beam acceleration in a realistic environment Cost- and performance optimized structures and their integration in CLIC

modules. Accelerating structure (ACS) alignment on girder using probe beam Wakefield monitor (WFM) performance in low and high power conditions

(and after a breakdown) Investigation of the breakdown effect on the beam

Alignment and stabilization systems in a dynamic accelerator environment RF network phase stability especially independent alignment of linacs Vacuum system performance especially dynamics with rf Cooling system especially dynamics due to beam loss and power flow

changes

Integration of all different sub-systems: , i.e. to simultaneously satisfy requirements of highest possible gradient, power handling, tight mechanical tolerances and heavy HOM damping

Validation of assembly, transport, activation, maintenance etc.


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Choke mode flange

AS (CLIC-G)

PETS (mini tank)

Compact couplerwith internal splitter

ON/OFF unit

130 MW

Coupler with internal splitter

“Hammer” 3 dB splitter

3 dB splitter

RF load ~ 65 MW (tbc)

RF diagnostic

PETS (mini tank)

AS AS AS

DB Quad

CLIC module type 0

From CLIC module to CLEX module

PETS PETS


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AS (CLIC-G)

Compact couplerwith internal splitter

Coupler with internal splitter

“Hammer” 3 dB splitter

3 dB splitter

RF load

RF diagnostic

PETS (mini tank)

AS AS AS

DB Quad

Existing 1-m PETS with recirculation

CLEX module type 0

From CLIC module to CLEX module

CLEX modules


14 accelerating structures5 PETS

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750

mm

Phase 3: Modules 0 and 4Phase 4: Module 1 - 4.1: double length PETS- 4.2: two CLIC PETS replacing 1

double length PETS

FINAL C

ONFIGURATIO

N

Accuracy of 5 um is an issue: few WFM in a single structure

CLEX modules - configurations


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No modifications on the test module type 0 HWNo RecirculationCurrent increase from 12 A to 19.2 APulse length reduced from 240 ns to 140 ns

No modifications on the test module type 0 HWAddition of a module type 1Increase of current from 19.2 A to 22 A

Phase 3, Conf. 3.1

Phase 3, Conf. 3.3

Phase 4, Conf. 4.1

Phase 4, Conf. 4.2

Nominal power and pulse length for 1 PETS and 2 ASRecirculation12 A and 240 ns

Modification on the test module type 1 HW (2 CLIC PETS)Needed klystrons and PC


Preliminary

integration study

of CLEX MODULES

014

A. Solodko

T0

T4

T1

Beam

Double-length PETS

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CONCLUSIONS


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Baseline defined for CDR Two alternative configurations to be studied: monogorder

and additional 1-cm long magnet in front of each quad decision by end of October 2010

In parallel study of other alternatives (e.g. cam system) Design has to be frozen by 1Q 2010 – a lot of work and

limited resources: needed close collaboration with all technical experts ADDITIONAL MANPOWER NEEDED, proposal for a meeting next week with JPD and HS agreement is urgent

Test module project with two parallel lines: in the lab (from 2010) in CLEX (from 2011) [also part of EuCARD – WP9.2 (G.

Riddone /WP9.3 (A. Jeremie)) ADDITIONAL MANPOWER NEEDED, meeting next week

with JPD and HS

CTC, Outcome from Two-beam Module Review on15/16.09.2009 G. Riddone, 20.10.2009.

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Transcript of CTC, Outcome from Two-beam Module Review on15/16.09.2009 G. Riddone, 20.10.2009.