Preparing for SCRF Meeting to be held at Fermilab, April 21-25

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Preparing for SCRF Meetingto be held at
Fermilab, April 21-25

• Report from
• Meetings at SLAC and Fermilab
• Akira Yamamoto
• April 6, 2008

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Meetings at SLAC and Fermilab
day Visit Meetings Notes Participants
4/2 SLAC HLRF and MLI, relation with LLRF, SCRF meeting agenda T. Raubenheimer, N. Phinney, C. Adolphsen
4/3 am Fermilab - General status and Plan at Fermilab Everybody
pm Fermilab - ILC and Project X, S1-global, Collaboration with India Fermilab program and ILC, S1-global, SCRF meeting agenda, - S.Holmes, R.Kephart, S. Mishra, - G. Apollinari, M. Champion, H. Carter, T. Peterson
4/4 am Fermilab Americas program, S0 in Americas, S1-global, EBW and optical inspection Cryomodule/cryogenics meeting agdenda M. Harrison G. Blazey M. Foley, C. Ginsburg, Iwashita T. Peterson
pm Fermilab -Close-out - Summary (post close-out) - M.Champion, T. Peterson, R. Stanek -P. Oddone, -R.Kephart
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SCRF MeetingFermilab, April 21-25, 2008Draft
Agenda, as of April-6

• General Agenda
• 4/21 Cavity Gradient RD, performance,
  diagnostics (S0),
• 4/22 Cavity Integration, Tuner, Coupler and
  String-Test (S1)
• 4/23 Cryomodule plug-compatible interface,
  high-pressure, 5K-shield
• 4/24 HLRF/LLRF and MLI Modulator,
  distribution, Beam-handling
• 4/25 Summary, TDP RD plan, and work-assignment
  

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What discussed in Tohoku GDE-Meeting?

• Cavity
• S0/S1 status and replan for TDP reported,
• S1-global concept and the technical feasibility
  at STF discussed,
• Tuner design
• discussed on how to compare each tuner design.
• Coupler design
• discussed on possible elimination of
  tunability.
• He vessel design
• Agreed design pressure, 2 bar,
• Consensus desired material to be St. Steel and
  necessary RD,
• Cryomodule
• Plug-compatibility and boundary conditions
  discussed,
• 5K shield design discussed, if necessary or not,
• Agreed vacuum vessel diameter unchanged,
• Quad design, location, and other beam related
  issue
• Agreed to locate at center, with alignment
  tolerance lt0.3 mm

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Objectives of SCRF Meeting at Fermilab, April
21-25, 2008

• Reach consensus on
• SCRF functional design parameters
• Plug-compatible interface parameters
• Update TDP RD plan and milestone
• Cavity
• Achieve 9-cell cavity performance of 35 MV/m
  (S0),
• Achieve cavity-string performance of 31.5 MV/m in
  cryomodule (S1)
• Cryomodule and Cryogenics
• Establish plug-compatible design and optimum
  thermal balance,
• HLRF/LLRF
• Establish efficient power source and distribution
  system,
• MLI
• Establish beam-handling design and boundary
  conditions
• System Engineering
• Achieve Cryomodule-String Test in one RF unit and
  with beam (S2)

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General Agenda for SCRF Fermilab Meeting, April
21-25
Day Subject Goal
4/21 Cavity preparation High gradient RD (S0) Plan for 35 MV/m
4/22 Cavity Integration and Test in cryomodule (S1) Tuner, Coupler, and Plan for S1-global
4/23 Cryomodule and Cryogenics Plug-compatible IF, HPG, 5K shield,
4/24 HLRF and Main Linac Integration Efficient RF powering Beam handling
4/25 Summary and TDP RD, work assignment, further meeting plan RD organization, Interium review plan
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April 21 Cavity-Process
Time Title Presented by
900 Opening Remark / Introduction A. Yamamoto
930 Highlights from regions S0, process and test for Ichiro-5 Cavity Optical inspection device R. Geng _. Iwashita
1030 Break
1100 Concise, focus on standard for understanding performance Asia Americas Europe (XFEL) H. Hayano/F.Furuta C. Ginsburg L. Lilje
1230 Lunch
1330 Plans and philosophy for evaluating performance, inspection, and diagnostics at each region - KEK, FNAL, Jlab, DESY, Cornell, and . Hayano, Champion, Rimmer, Lilje, Padamsee .
1530 Break
1600 Strategies for RD Plan (S0) 35 MV/m with yield of 50 for TDP-1 and 35 MV/m with yield of 90 for TDP-2 Led by Lilje
1730 Comments H. Padamsee (AAP)
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April 22 Cavity-Integration
Title Subjects Presented/organized by
900 Tuner -Lorentz detuning, and discussions Ball-screw-tuner test results (for LL cavity) Blade-tuner (update) and/or any others status/proposal? Relaiability of the motor and the Maintenatibility Y. Yamamoto T. Saeki TBD TBD
1030 Break
1045 Discussions for tuner specification and comparison table Base-line designs and necessary RD/evaluation in TDPs Led by H. Hayano
1230 Lunch
1300 Coupler XFEL coupler industrial assessment, and industrialization Fixed/variable coupler cost difference technical issues Requirements from RF power distribution system in view of MLI Discussions on coupler specification and interface S. Prat S. Noguchi E. Kako C. Adolphsen Led by H. Hayano
1600 Project X RD at Fermilab , joint session with Muon Coll. WS). S. Holmes
1700 Cavity-string test in cryomodule (S1 and S1-global) S1 plan at FNAL S1-global plan - Work required at KEK and global assembly (technical feasibility) - Cooperation with FNAL / Cooperation with DESY S. Mishra/M. Champion N. Ohuchi and D. Mitchell S. Mishra / L. Lilje
1830 Comments H. Padamsee (AAP)
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April 23 Cryomodule/ Cryogenics
Time Title Presented by
900 Cryomodule functional parameters and interfaces N. Ohuchi/H.Carter
930 Plug-compatibility (for cavity and cryomodule, HLRF) -Interfaces (CAD-work boundary condition) of plug-compatible design Parameters tables for interfaces D. Mitchell H. Hayano and N. Ohuchi
1045 Break
1100 Discussions Conclusion/Consensus (Table filled) and Further study required Led by Ohuchi and Carter
1230 Lunch
1330 High Pressure Gas Regulation Requirements and the regional constraints (How to handle Nb summary of survey based on e-mail communication). Comments and discussions for further works T. Peterson H. Nakai, K.Jensch
1500 Break
1600 Thermal balance in cryomodule/cryogenics 5 K shield study at TTF cryomodule design 5 K shield study at STF cryomodule design Lowering radiation shield (80K) temperature Discussions and conclusion/consensus P. Pierini N. Ohuchi N. Ohuchi led by Ohuchi/Peterson)
1730 Comments H. Padamsee (AAP)
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April 24 HLRF ( LLRF), MLI
Time Title Presented by
900 HLRF functional parameters and interfaces S. Fukuda
915 RF Power Sources RD status of SBK, and Marx Generator Progress with MBK (test results?) Discussions and strategy to reflect the work for TDP RD activities, TBD from SLAC TBD from DESY Led by Fukuda
1030 Break
1045 Power Distribution System and Plan for Test Facilities Design and RD status at SLAC Plan for NML at FNAL Design and RD status at KEK and preparation for STF and S1-global Necessary cooperation with LLRF status and requirements (TBD) LLRF cooperation expected to STF and S1-global work at KEK Discussions and strategy to reflect the work for TDP RD activities, TBD from SLAC S. Nagaitsev S. Fukuda B. Chase S. Michizono Led by Fukuda
1245 Lunch
1345 Main Linac Integration (MLI) Functional and interface parameters Quadrupole RD and Test Progress/Plan Alignment and the requirements Quadrupoles/BPM BPM and diagnostice RD status and various options C. Adolphsen C. Adolphsen/TBD C. Adolphsen TBD
1545 Break
1600 Discussions and consensus for further RD strategy, Led by Adolphsen
1730 Comments H. Padamsee (AAP)
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April 25 Summary Work Assignment
Time Title Presented by
900 Requirements for the Summary and Work Assignment A. Yamamoto
930 Cavity-Process Cavity-Integration L. Lilje H. Hayano
1030 Break
1045 Cryomodule and cryogenics HLRF MLI N. Ohuchi/T.Peterson S. Fukuda C. Adophsen
1230 Lunch
1330 General Summary Functional Parameters General guide-line for plug-compatibility Common interface parameters (consensus) Works for further consensus General Comments Closing Remark Led by Yamamoto H. Padamsee (AAP) A. Yamamoto
1530 Ajorn
1600 Group leader meeting for further planning Group Leaders

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SCRF Area Organization in TDPas of April 5, 2008
Regional Effort Harrison, Foster, Nozaki Regional Effort Harrison, Foster, Nozaki Regional Effort Harrison, Foster, Nozaki SCRF Technical Effort Yamamoto, Shidara, and Kerby SCRF Technical Effort Yamamoto, Shidara, and Kerby SCRF Technical Effort Yamamoto, Shidara, and Kerby SCRF Technical Effort Yamamoto, Shidara, and Kerby SCRF Technical Effort Yamamoto, Shidara, and Kerby SCRF Technical Effort Yamamoto, Shidara, and Kerby
Institute Institute Leaders Cavity Process Lilje Cavity Integ. Hayano Cryomodule Ohuchii/Carter Cryogenics Peterson HLRF (LLRF) Fukuda ( ) M LI Adolphsen
AMs Cornell Fermilab SLAC ANL J-lab Padamsee Kephart Raubenheimer Gerig Rimmer Padamsee Champion Kelly Champion Adolphsen Champion Peterson Larsen Adolphsen
EU DESY CERN Saclay Olsay INFN CIEMAT Brinkmann Delahaye Dael Wormser Pagani Lilje L. Lilje Prat Pagani Parma Pierini Tavian
AS KEK Korea IHEP RRCAT/BART IUAC VECC Yokoya Gao Sahni Roy Bhandari Hayano Hayano Tsuchiya/Ohuchi Hosoyama / Nakai Fukuda Hayano
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Further Meeting Plans

• 2008
• April 2-4
• Visit and meeting at SLAC and FNAL (by AY)
• April 21-25
• SRF Main Linac Technology Meeting at Fermilab
• June 4-6 JINR
• GDE Meeting (Dubna) ILC CFS Workshop
• SCRF No working group meeting organized
• July-September
• Visit to Cornell, INFN, CIEMAT, J-lab (for
  future Korea, China)
• October 20-24
• TTC (Delhi)
• November 16-20
• LCWS / GDE Workshop (Chicago)
• 2009
• January-Feburay, 2009?
• AAP SCRF interim-review (To be discussed)

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Backup
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SCRF Cavities to be plug-compatible
Many thanks for Don Mitchell and Lars Hagge for
3D-CAD and EDMS
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DESY / KEK / FNAL Cavities
DESY
KEK
FNAL
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Combined Cavity-Stringfor comparison
FNAL
KEK
KEK
DESY
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Replan of ILC-SCRF RD updated, March 4, 2008

• TDP1 by 2010
• S0 achieve 35 MV/m with 9-cell cavities at the
  yield 50 under well defined processing-base,
• S1-Global achieve lt31.5 MV/mgt with
  cryomodule-assembly
• with global cooperation (for example, 4-AS, 2-US,
  2-EU).
• Note the S1 achievable also, if 3 Tesla-type
  cavities added to the existing 5 cavities in CM2
  at Fermilab.
• Cryomodule design establish plug-compatible
  interface and design
• TDP2-by 2012
• S0 achieve 35 MV/m with 9-cell cavities at the
  yield 90 under well defined processing-base.
• S1 achieve lt31.5 MV/mgt with full cavity-assembly
  (similarly processed) in single cryomodule, CM3
  or CM4 (at Fermilab, US)
• S2 achieved lt31.5 MV/mgt with 3 cryomodule
  assembly to be powered by 1 RF unit, and with
  beam acceleration, in STF-2 at KEK.
• Industrialization Learn from XFEL, Cooperation
  with Project-X

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Global RD Plan
Calender Year 2008 2008 2009 2010 2010 2011 2012
EDR TDP1 TDP1 TDP1 TDP1 TDP1 TDP-II TDP-II TDP-II
S0 Cavity Gradient (MV/m) 30 35 (gt 50) 35 (gt 50) 35 (gt 50) 35 (gt 50) 35 (gt90)
KEK-STF-0.5a 1 Tesla-like/LL
KEK-STF1 4 cavities
S1-Global (AS-US-EU) 1 CM (422 cavities) CM (4AS2US2EU) lt31.5 MV/mgt CM (4AS2US2EU) lt31.5 MV/mgt
S1(2) -ILC-NML-Fermilab CM1- 4 with beam CM2 CM3 CM3 CM4
S2STF2/KEK 1 RF-unit with beam Fabrication in industries Fabrication in industries Fabrication in industries STF2 (3 CMs) Assemble test STF2 (3 CMs) Assemble test
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SCRF RD Plan at Fermilabgiven in a P5 talk by
S. Holmes
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Timeline
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RF Unit Test Facility (Staged)
Existing Building
New ILC like tunnel
ILC RF unit
Diagnostics
Gun
3rd har
2nd ILC RF unit
CC I,II
Bunch Compressor
Laser
Test Area
New Building
Test Areas
RF Equipment

• Overall Plan Test ILC RF units
• 3 CM, Klystron, Modulator, LLRF
• Move A0 Injector to provide ILC like beam
• New bldg diagnostic, AARD, new cryo plant
• ILC Twin tunnel design to allow 2nd RF unit and
  to study tunnel layout and maintenance issues

new 300 W cryo plant
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Possible Schedule plans
Revised after discussion
CY2008 2009
2010
STF
assembly
STF1 (4 cavity test)
Module A
disassemble
5,6 process, VT, jacket
connection
S1 Global (connected module)
(7, process, VT, jacket)
LL 1 test
operation
assembly
Module B
disassemble
6 month operation exp.
(LL 7,8 process, VT, jacket)
FNAL
Y1, Y2 (Y3) tuner, jacket, coupler
DESY
X1, X2 (X3) tuner, jacket, coupler
?
S1 Global at STF by H. Hayano
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S1 Global at KEK
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Progress in the GDE Tohoku Meetingand Further
Studies expected
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Cavity ProcessGroup Leader Lutz. Lilje
Subject Discussed Agreed To be further studied
Functional parameters
Etching EP As base line needed for gt 30 MV/m
Cleaning Ethanol, Degreasing, Flash-EP High Pressure Linse Either one effective As base line Further systematic studies Reliability in Long term oper.
Alignment Horizontal/vertical Tilting/yowing lt 0,3 mm Cost effective solution, lt 90 ?-rad ?, if realistic?
Diagnostics Thermal mapping Optical inspection Important important encouraged, World-wide use recommended
Material Grain-size/single-crystal Important for understanding Basic study to be extended for future possibility for simple process and cost redcuion
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S0 Next steps by Lutz Lilje
Status (1) Field emission has been reduced
by three approach ethanol,
degreaser, fresh-EP. (2) Still
rather large gradient differences
are observed due to thermal breakdowns.

• The basic RD goals for S0 not changed. The
  timescale extended.
• End of 2008
• need to enhance T-map high-res optical
  inspection worldwide
• use welded single-cells to 'calibrate' these two
  methods for mapping and inspection
• use tight-loop to set up preparation facilities
  (ANL, KEK)
• cost advantage large grain evaluation (in purpose
  of comparison)
• continue production-like effort
• Mid of 2009
• large-grain detailed study after EP and BCP
• comparison seamless with welded
• Flash EP on multi-cells in Cornell (and KEK?)
• TDP1 technical feasibility by 2010
• Gradient (S0) in progress to reach 35 MV/m w/
  yield 50
• TDP2 technical credibility by 2012
• Gradient (S0) to reach 35 MV/m w/ yield 90

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Cavity IntegrationGroup Leader Hitoshi Hayano
Subject Discussed Agreed To be further studied
Functional parameters
Tuner Lorentz detuning, Motor maintainability Individual component life tests
Coupler Fixed/tunable Cost effective power feeding
He-vessel To be made of SUS Bi-metal joint desired Component RD
Envelop/Interface Plug-compatibility Interface components Quantitative conditions,
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Tuner design discussion
H. Hayano (1) Tuner specification profile
table update (2) Tuner performance comparison
table, for next step.
Y. Yamamoto (1) Calculation of cavity voltage
vector evolution assuming two mechanical
mode excitation by LD. (2) Explanation of STF
cavity and DESY cavity. -gt still need more
precise calculation, stiffness comparison
should be done after full understanding of
calculation and observation.
S. Noguchi (1) Slide-jack tuner performance.
L. Lilje (1) XFEL tuner performance (2)
Blade tuner performance.
T. Himel (1) Estimation of tuner motor MTBF
gt several M-hours. or should have easy to
repair in situ.
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Coupler design discussion
H. Hayano (1) Coupler specification profile
table update (2) Think about tunability fixed
is cost-effective or not.

• S. Noguchi
• Grouping of cavities having gradient spread,
• combination high gradient module
  with two low modules.
• (2) Power tuning has benefit rather than coupler
  power tuning.
• ( coupler tuning fixed )

G. Wormser (1) Cost reduction of XFEL coupler
808 by three venders. (2) Cost is almost in
target by detail reduction for every parts
and process.
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Cryomodule and CryogenicsGroup Leaders Norihito
Ohuchi, (deputy) Harry CarterThomas Peterson
Subject Discussed Agreed To be fu rther studied
Functional parameters Parameter list
High Press. regulation Design pressure 2 bar Emergency mode, failure mode analysis,
Thermal balance W/ or w/o 5 K shield minor difference Study to reduce shield temp from 80 K to be lower,
Alignment lt 0.3 mm realistic? Yes Evaluate with S1, CM/STF, Cost effective alignment in production,
Envelope/interface Interface components EDMS work Vac. Ch. Diameter List-up No change CAD design work for compatibility b/w ILC others
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Plug compatibility concept
N. Ohuchi (1) List up of C1-level, C2-level,
C3-level compatibility for cryomodule. (2) Must
work on C1-level compatibility cryomodule. (3)
C3-level is not considered, so far. (4) As for
C2-level, think about cavity string rather than
cavity package -gt people feel to consider
cavity package, not string.
D. Mitchell Discussion with 3D-CAD viewer (1)
Where the interface is for cavity package.
(2) plug compatible
design to be conflict with cost reduction?
Think to unify flange system? Think about
cramp flange?, assembly?, process?,
qualification?....
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He vessel design discussion
K. Tsuchiya (1) Ti/SS transition study by
friction welding, by HIP method. (2) HIP
transition was used in STF. (3) Nb/St.St.
transition by explosion method was used in LL
cavity.

• F. Bedeschi
• Study of tube explosion bonding on Ti/SS
  transition.
• (2) Possibility to use for larger transition part
  like He vessel.

• L. Lilje
• He vessel pressure test was performed
• 6.2 bar at 2K, 5.3 bar at 295K
  were only elastic deformation.

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5K-shield Elimination

• N. Ohuchi
• (5K shield cost) (D(10 years operation cost)
  cryogenics reinforce)
• 10 of cryomodule cost means cost
  reduction .
• (2) Vessel size reduction by this elimination
• -gt unable to keep distance to 300K.
• (3) Need to evaluate to use 60K cooling for 80K
  shield.

• P. Pierini
• Thermal calculation of TTF module
• 15 - 55 cost increase of 2K
  line operation w/o 5K shield.
• (2) Thermal analysis of M3 module will be done,
  next.

• T. Peterson
• 5K shield elimination on LHC-dipole was decided
  mainly by simplicity,
• not by cost cost diff. was small.
• (2) Lowering 80K shield temperature is under
  analysis.
• -gt able to reduce 2K heat load.

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High Level RF Group Leader Shigeki Fukuda
Subject Discussed Agreed To be further studied
Modulator Marx generator desired Technical mile-stone,
Distribution Cavity performance distribution Tunability Need to accept necessary Communication with cavity to optimize the tunability and effiency in RF power,
Interface to LLRF Optimum organization and communication
Cooling power Communication with CFS Further study on the cooling cost redution, dT higher?

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Main Linac Integration Group Leader Chris
Adolphsen
Subject Discussed Agreed To be further studied
Quadrupole Alignment at center Tilting Quadrupole design Possible Minor problem Engineering design study
Beam dynamics Beam handling by steering w/ lt 100 nm Possible Possible gtgt no Further detail requirements from beam dynamics
Tunnel Sinble tunnel ro twin tunnerl How HLRF and LLRF placed?


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Quad design and other beam related issue
C. Adolphsen (1) Quad alignment specification
lt200µm to module axis, lt100nm
vibration gt0.1Hz. lt300µrad for
rotation. (2) Temp change affect Quad motion
by 6µm when beam on/off. by 160µm
bow/deg module top-to-bottom temp change. (3)
Cos 2-theta design for 2/3 of linac, 0.6m length
90mm aperture. however superferric design is
good for mag center stability. (4) lt200µm
fuducialization required. (5) Alignment windows
may need to monitor quad position secure. (6)
Manual module adjustability, at minimum,
cm-level range, 50µm level positioning. (7) BPM
performance, (8) HOM coupler kick will be
minimized to move symmetric. (9) HOM polarization
rotation will be a problem. (10) Beamline HOM
absorber study. .
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GDE (Dubna) Meeting

• Goals
• Examine the CFS requirements of both ILC and
  CLIC.
• Develop models for cost scaling to various
  alternative sites and CFS configurations, in
  particular shallow sites and single-tunnel
  options.
• Examine the conventional facilities of the
  machines with particular attention to the cost
  drivers (process cooling water etc.), and
  understand the impact on them with respect to the
  choice of site configuration
• Review in detail the JINR site proposal
• Accelerator design of the central injector
  complex, RTML and BDS.

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GDE Dubna Meeting WGs
WGs Subjects Convener
1 Shallow solutions Explore features and develop reduced-cost, shallow tunnel solutions. Both CLIC and ILC. Includes single tunnel. DubnaILC-CFS(CERN)
2 Infrastructure Review infrastructure requirements and develop cost-effective solutions for accelerator infrastructure power, water, air etc. Both CLIC and ILC. DubnaILC-CFS (KEK)
3 Siting Examine possible sites and evaluate possible design differences that accommodate features. Includes staging, design modifications and upgrade issues. AS Integration
4 Accelerator Systems particular focus on the central injection complex, BDS and RTML, including beam dynamics. Two AS leaders