CLIC rf structure program
Walter Wuensch
5th CLIC X-band collaboration meeting
16 May 2011
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.
Walter Wuensch
5th CLIC X-band collaboration meeting
16 May 2011
CERN MTP (draft) for 2012-2016
Walter Wuensch
5th CLIC X-band collaboration meeting
16 May 2011
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!
Walter Wuensch
5th CLIC X-band collaboration meeting
16 May 2011
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
Walter Wuensch
5th CLIC X-band collaboration meeting
16 May 2011
Main areas for next stage 2
•Re-optimize high-gradient design – We only now have highgradient 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.
Walter Wuensch
5th CLIC X-band collaboration meeting
16 May 2011
Main areas for next stage 3
• 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 highpower 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.
Walter Wuensch
5th CLIC X-band collaboration meeting
16 May 2011
CLIC collaborations with other
projects
• 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 meeting
Walter Wuensch
6 May 2011
A scenario for high-power testing
2011
2012
High-power, high rep-rate test areas
klystron 1 (plus linac dog-leg, CLEX feed)
klystron 2 (SM18)
klystron 3 (SM18)
klystron 4 (SM18)
klystron 5 (SM18)
klystron 6 (SM18)
klystron 7 (SM18)
2013
operation at 1 structure/stand
purchasing/comissioning
2014
2015
2016
development
series and long term
operation at 2 structures/klystron
operation at 2 structures/klystron
operation 2 klystrons into 1 PETS
operation at 2 structures
operation at 2 structures
operation at 2 structures/klystron
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
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
12
12
12
12
15
15
15
15
20
15
10
5
0
1
18
19
20
21
22
23
24
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.
CLIC meeting
Walter Wuensch
6 May 2011
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).
CLIC meeting
Walter Wuensch
6 May 2011
X-band Rf structure Design
WP: RF-design
Purpose/Objectives/Goals
Deliverables
Schedule
Task 1: Design of accelerating xband 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 scenario
or 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:
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:
2011
X-band Rf structure Production
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 2013
24 in 2015
12 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 2013
1 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
Resources:
2011
2015 onwards
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
CERN Personnel (FTE):
2
2
2
2
2
10
X-band Rf structure High Power Testing
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
Link to other WPs/activities:
Lead collaborator(s):
Resources:
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
CERN Personnel (FTE):
1
1
2
2
2
8
Resources comment:
2011
Creation and Operation of x-band High power Testing Facilities
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 2013
2 in 2014
2 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 2013
1 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
Link to other WPs/activities:
Lead collaborator(s):
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
CERN Personnel (FTE):
1
1
1
1
1
5
Basic High Gradient R&D & Outreach
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 highgradient 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
Link to other WPs/activities:
Lead collaborator(s):
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
2
2
2
2
2
10
Fellows (FTE)
CERN Personnel (FTE):
Resources comment:
Creation of an “In-House” TBA Production Facility
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
Link to other WPs/activities:
Lead collaborator(s):
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
1
1
1
1
1
5
Fellows (FTE)
CERN Personnel (FTE):
Miscellaneous RF
WP: RF-misc
Purpose/Objectives/Goals
Deliverables
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.
Schedule
Overall material total 38.6 MCHF
(out of 85.6x1.3=111 MCHF)
Link to other WPs/activities:
Lead collaborator(s):
Resources:
2011
2012
2013
2014
2015
2016
Total
0.5
0.5
0.5
0.5
0.5
2.5
M (kCHF)
M>P (kCHF)
P<M (FTE)
Fellows (FTE)
CERN Personnel (FTE):
Resources comment: