5 th CLIC X-band collaboration meetingWalter Wuensch16 May 2011 CLIC rf structure program.

5th CLIC X-band collaboration meetingWalter Wuensch 16 May 2011

CLIC rf structure program


CLIC today

• Most feasibility issues for CLIC have been demonstrated, with good momentum on remaining open issues e.g. TD24, CTF3, stabilization.• CDR writing underway (sigh).• Linear collider (CLIC+ILC+accelerator+detector) study leader at CERN – Steinar Stapnes • Solid support from CERN management.• Next phase, with roughly five year time-scale, to move towards project is being planned.• Working assumption – consistent with CERN MTP (Medium Term Plan) + 30% contributions from collaborators.


CERN MTP (draft) for 2012-2016


rf structures today

• Individual structures basically achieving specifications, both PETS and accelerating structures.• Almost have baseline structure – some features still need to be demonstrated like accelerating structure compact couplers, include SiC loads.• Structure fabrication at KEK/SLAC, CERN and soon Saclay.• Testing at NEXTEF, NLCTA, ASTA, CTF3 and CERN klystron. Critical – no structure under test today!


Main areas for next stage 1

• Fully establish baseline structure - Test of fully featured CLIC_G. Remaining features are TD24, compact power couplers and SiC loads. Check dynamic vacuum (tricky). Verify tolerances, wakefield monitor performance and long range wakefield suppression. • Statistics – We need numbers for production yield and to verify long-term behavior.• Significant increase in high-power testing capability – at least 6 test stands operating in parallel.• Machining/metrology infrastructure – At CERN or at collaborating laboratory for better in-house insight into key technologies.• Cost studies • Integration into modules


•Re-optimize high-gradient design – We only now have high-gradient data that really lets us do this. Current design made end 2007. This will probably be done while re-optimizing for an intermediate energy CLIC. Easily room for O(10%) effects in efficiency and cost. Need to understand effect of beam loading, experiment planned.•Optimize process – Deeper understanding of breakdowns ready to help us optimize machining, chemical surface treatment, heat treatments and conditioning strategy. We have something that works but there is the potential to reduce conditioning time and save lots of money. • Other types of X-band structures – Structures optimized to intermediate/early stage energies, crab cavity and bunch compressor cavity.



• Alternative baseline designs – We followed a path to get the highest gradient earliest. Not obvious if this gives highest performance, cheapest structure. Ongoing activities are DDS with Manchester and choke mode with Tsinghua. Are we in a local or a global optimum? • Fundamental breakdown studies –Guide rf design through high-power scaling laws, process optimization and testing. Excellent training for young people, ties in diverse collaborators.• Exotic structures – Alternative materials, standing wave, speed bumps, recirculation etc. Still the potential for a breakthrough. Depending on LHC results a 3 TeV range machine may be proceeded by two lower energy stages – which means decades to get some of this stuff to work.• Outreach – Good to spread X-band and high-gradient technology to other applications. Increased experience, increased credibility and lower cost. Obligation to give return on our R&D.


CLIC meeting Walter Wuensch 6 May 2011

• XFEL energy linearization – PSI and Trieste• XFEL compact 1 kHz nc linac – Groningen• High-gradient normal conducting cavities for carbon ion acceleration – TERA• High-gradient normal conducting cavities – Muon collider• High-gradient superconducting cavities – ILC

CLIC collaborations with other projects


2011 2012 2013 2014 2015 2016High-power, high rep-rate test areas

klystron 1 (plus linac dog-leg, CLEX feed) operation at 1 structure/stand developmentklystron 2 (SM18) purchasing/comissioning operation at 2 structures/klystron series and long termklystron 3 (SM18) operation at 2 structures/klystronklystron 4 (SM18) operation 2 klystrons into 1 PETS operation at 2 structures/klystronklystron 5 (SM18) operation at 2 structures/klystronklystron 6 (SM18) operation at 2 structures/klystronklystron 7 (SM18) operation at 2 structures/klystron

KEK development

SLAC development

number of rf ports 2 2 3 3 3 3 3 3 7 7 7 7 8 8 8 8 12 12 12 12 15 15 15 15

0

5

10

15

20

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

A scenario for high-power testing

In my personal opinion increasing our testing capability is the most crucial issue we currently face. If we have enough test slots the rest will follow.


Work package planning

I will now show the technical program broken down into DRAFT work packages.

The work packages will be used to plan resources with CERN departments and groups and to establish and structure collaborations.

The packages are NOT in their final form. On the largest scale they are getting close, details are not always so good (which doesn’t really matter).

WP: RF-design Purpose/Objectives/Goals Deliverables Schedule

Task 1: Design of accelerating x-band structures

Contribution and follow-up to parameter evolution of CLIC project; optimization of designs for gradient and low breakdown rate:Optimize heat treatment and chemistry, optimized conditioning, machining stresses, roughness and BDR, wakefield measurements, pulsed surface heating investigation, couplers, special rf tests etc.

Better designs, new designs for new construction scenarioor energy staging

2012-2016

Task2: Design of PETS Refinement of designs, optimized ON/OFF 2012-2016

Task3: Design of auxiliary components

WFM, Rf networks, breakdown monitors 2012-2016

Task 4: test definition and analysis Contribution to definition of high power test program, contribution to data analysis, integration of test results

Link to other WPs/activities:

Lead collaborator(s):

Resources: 2011 2012 2013 2014 2015 2016 Total

M (kCHF) 200 250 300 300 300 1350

M>P (kCHF) 200 250 300 300 300 1350

P<M (FTE) 4 5 6 6 6 27

Fellows (FTE) 3 4 4 4 4 19

CERN Personnel (FTE):

2 2 2 2 2 10

Resources comment:

X-band Rf structure Design

WP: RF-xprod Purpose/Objectives/Goals Deliverables Schedule

Task 1: Construction of baseline accelerating structures

Test structures for statistical and long term high-power testing with all damping features and high power couplers

3 generations of test structures, total quantity 48, total cost 6 MCHF.

12 in 201324 in 201512 in 2016

Task 2: Supply of small series development prototypes and/or medium power test structures

Test structures for full features (4), wakefield monitor equipped (4), optimized high-power design (8), different machine energy optima (4), optimized process (8), develop DDS (2) and choke (2), compressor (2)

Typically 12 variants in series of 4 structures each, total quantity 40, total cost 6 MCHF.

8 structures per year

Task 3: Supply baseline PETS (note: most PETS fabrication accounted elsewhere, e.g. TBL)

PETS for statistical and long term high-power testing 4 PETS, total cost 0.2 MCHF. 3 in 20131 in 2015

Task 4: PETS for ON/OFF testing PETS for on/ off test 2 generations 0.1 MCHF

Task 5: Baseline to pre-series development

Take the fully tested x band rf Systems and evolve their production techniques to an industrialized process

2015 onwards

Resources: 2011 2012 2013 2014 2015 2016 Total

M (kCHF) 3500 3500 3600 3800 3900 18300

M>P (kCHF) 500 500 600 700 700 3000

P<M (FTE) 6 6 8 9 9 30

Fellows (FTE) 0 0 0 0 0 0


2 2 2 2 2 10

X-band Rf structure Production

WP: RF-xtesting Purpose/Objectives/Goals Deliverables Schedule

High power testing of x band structures

-Establish in collaboration with designers and producers a test-schedule for the facilities at CERN, KEK and SLAC- Organize manpower for the tests-define consolidation and repair needs- lead the data analysis of the tests- suggest changes to designs and/or fabrication

-Structure Tests-Analysis of results

2012-2016



Resources: 2011 2012 2013 2014 2015 2016 Total

M (kCHF) 200 250 250 250 250 1200

M>P (kCHF) 200 250 250 250 250 1200

P<M (FTE) 4 5 5 5 5 24

Fellows (FTE) 3 3 4 4 4 18


1 1 2 2 2 8

Resources comment:

X-band Rf structure High Power Testing

WP: RF-Testfac Purpose/Objectives/Goals Deliverables Schedule

Task 1: High-power test stands 6 new klystron-based test stations with approximately 140 MW peak power each.

6 test stands. Cost of 0.5 MCHF per modulator, 1 MCHF per 50 MW klystron, 0.5 MCHF infrastructure. Total cost 12 MCHF plus operation.

2 in 20132 in 20142 in 2015

Task 2: Medium power, high rep rate test stand

2 test stands with 4x80 MW 100 Hz slots based on four 5 MW klystrons.

2 test stands. Cost of 0.25 MCHF per modulator, 0.1 MCHF per 5 MW klystron, 0.25 MCHF infrastructure. Total cost 1.8 MCHF.

1 in 20131 in 2014

Task 3: Test stand operation Operation of high power test facility at CERN: Provide high uptime, schedule maintenance and repair periods. Link to other test facilities.

Maintenance of installation, crews for maintenance

2012-2016



Resources: 2011 2012 2013 2014 2015 2016 Total

M (kCHF) 500 4200 5400 5400 500 16000

M>P (kCHF) 100 200 500 500 100 1400

P<M (FTE) 2 3 7 7 2 21

Fellows (FTE) 0 0 0 0 0 0


1 1 1 1 1 5

Creation and Operation of x-band High power Testing Facilities

WP: RF-R&D Purpose/Objectives/Goals Deliverables Schedule

Task 2: dc spark test areas 10 kHz range, scanning, fully instrumented dc spark systems

2 systems for a total cost of 0.5 MCHF

Task 3: Theoretical and experimental studies of high-gradient and high-power phenomena

Basic understanding of high-gradient and high-power phenomena including breakdown, pulsed surface heating, high-power rf design dynamic vacuum and dark current.

Task 4: Application of high-gradient and high-frequency technology to other projects

Create technology base for compact normal conducting accelerators.

Task 5: Beam-based experiments e.g. FACET

Define and follow up beam based experiments such as long-range wakefield measurements.

FTEs accounted elsewhere



Resources: 2011 2012 2013 2014 2015 2016 Total

M (kCHF) 350 350 350 350 350 1750

M>P (kCHF) 300 300 300 300 300 1500

P<M (FTE) 4 4 4 4 4 20

Fellows (FTE)


2 2 2 2 2 10

Resources comment:

Basic High Gradient R&D & Outreach

WP: RF-xTBA-Fac Purpose/Objectives/Goals Deliverables Schedule

Task 1: Collect requirements for an CLIC x-band CERN production site; identify possible locations

Project proposal, site proposal 2011

Task2 Detailed list of requirements, balance between continuous outsourcing and CERN in-sourcing(include alignment and stabilization?), metrology, brazing, high precision machining, surface treatment

Choice of location, budget approval including EN part

2012

Task 3 Construction of site Staged completion of site 2012-2016

Task4 Construction of x-band structures and TBA assemblies Parts for needed x-band structures, metrology and assembly of TBAs

2013-2016



Resources: 2011 2012 2013 2014 2015 2016 Total

M (kCHF) 200 2000 2000 200 200 4600

M>P (kCHF) 200 200 200 100 100 800

P<M (FTE) 3 3 3 2 2 10

Fellows (FTE)


1 1 1 1 1 5

Creation of an “In-House” TBA Production Facility

WP: RF-misc Purpose/Objectives/Goals Deliverables Schedule

Task 1: Main beam rf systems for injector and booster linacs.

Design main beam injector and booster linac rf systems and launch appropriate hardware studies and tests.



Resources: 2011 2012 2013 2014 2015 2016 Total

M (kCHF)

M>P (kCHF)

P<M (FTE)

Fellows (FTE)


0.5 0.5 0.5 0.5 0.5 2.5

Resources comment:

Miscellaneous RF

Overall material total 38.6 MCHF(out of 85.6x1.3=111 MCHF)

5 th CLIC X-band collaboration meetingWalter Wuensch16 May 2011 CLIC rf structure program.

Documents

Transcript of 5 th CLIC X-band collaboration meetingWalter Wuensch16 May 2011 CLIC rf structure program.