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

Preparing for SCRF Meeting to be held at Fermilab, April 21-25. Report from Meetings at SLAC and Fermilab Akira Yamamoto April 6, 2008. Meetings at SLAC and Fermilab. SCRF Meeting Fermilab, April 21-25, 2008 Draft Agenda, as of April-6. General Agenda:

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

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  1. Preparing for SCRF Meetingto be held at Fermilab, April 21-25 Report from Meetings at SLAC and Fermilab Akira Yamamoto April 6, 2008 Rev. Apr. 7, 2008

  2. Meetings at SLAC and Fermilab Rev. Apr. 7, 2008

  3. SCRF MeetingFermilab, April 21-25, 2008Draft Agenda, as of April-6 General Agenda: 4/21: Cavity: Gradient R&D, 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 R&D plan, and work-assignment Rev. Apr. 7, 2008

  4. 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 R&D, • 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 <0.3 mm Rev. Apr. 7, 2008

  5. Objectives of SCRF Meeting at Fermilab, April 21-25, 2008 • Reach consensus on • SCRF functional design parameters • Plug-compatible interface parameters • Update TDP R&D 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) Rev. Apr. 7, 2008

  6. General Agenda for SCRF Fermilab Meeting, April 21-25 Rev. Apr. 7, 2008

  7. April 21: Cavity-Process Rev. Apr. 7, 2008

  8. April 22: Cavity-Integration Rev. Apr. 7, 2008

  9. April 23: Cryomodule/ Cryogenics Rev. Apr. 7, 2008

  10. April 24: HLRF (& LLRF), MLI Rev. Apr. 7, 2008

  11. April 25: Summary & Work Assignment Rev. Apr. 7, 2008

  12. SCRF Area Organization in TDPas of April 5, 2008 Rev. Apr. 7, 2008

  13. 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) Rev. Apr. 7, 2008

  14. Backup Rev. Apr. 7, 2008

  15. SCRF Cavities to be plug-compatible Rev. Apr. 7, 2008 Many thanks for Don Mitchell and Lars Hagge for 3D-CAD and EDMS

  16. DESY / KEK / FNAL Cavities DESY KEK FNAL Rev. Apr. 7, 2008

  17. Combined Cavity-Stringfor comparison FNAL KEK KEK DESY Rev. Apr. 7, 2008

  18. Replan of ILC-SCRF R&D updated, March 4, 2008 • TDP1 by2010: • S0: achieve 35 MV/m with 9-cell cavities at the yield 50 % under well defined processing-base, • S1-Global: achieve <31.5 MV/m> 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 <31.5 MV/m> with full cavity-assembly (similarly processed) in single cryomodule, CM3 or CM4 (at Fermilab, US) • S2: achieved <31.5 MV/m> 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 Rev. Apr. 7, 2008

  19. Global R&D Plan Rev. Apr. 7, 2008

  20. SCRF R&D Plan at Fermilabgiven in a P5 talk by S. Holmes Rev. Apr. 7, 2008

  21. Timeline Rev. Apr. 7, 2008

  22. 72 M ~ 22 M 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 Rev. Apr. 7, 2008

  23. Possible Schedule plans **Revised after discussion CY2008 2009 2010 STF STF1 (4 cavity test) assembly Module A disassemble #5,#6 process, VT, jacket connection S1 Global (connected module) (#7, process, VT, jacket) LL #1 test assembly operation 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 Rev. Apr. 7, 2008

  24. S1 Global at KEK Rev. Apr. 7, 2008

  25. Progress in the GDE Tohoku Meetingand Further Studies expected Rev. Apr. 7, 2008

  26. Cavity: ProcessGroup Leader: Lutz. Lilje Rev. Apr. 7, 2008

  27. “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 R&D 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 % Rev. Apr. 7, 2008

  28. Cavity: IntegrationGroup Leader: Hitoshi Hayano Rev. Apr. 7, 2008

  29. 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. -> 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 : > several M-hours. or should have easy to repair in situ. Rev. Apr. 7, 2008

  30. 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. Rev. Apr. 7, 2008

  31. Cryomodule and CryogenicsGroup Leaders: Norihito Ohuchi, (deputy) Harry CarterThomas Peterson Rev. Apr. 7, 2008

  32. “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’ -> 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?.... Rev. Apr. 7, 2008

  33. 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. Rev. Apr. 7, 2008

  34. 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 • -> 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. • -> able to reduce 2K heat load. Rev. Apr. 7, 2008

  35. High Level RFGroup Leader: Shigeki Fukuda Rev. Apr. 7, 2008

  36. Main Linac IntegrationGroup Leader: Chris Adolphsen Rev. Apr. 7, 2008

  37. Quad design and other beam related issue C. Adolphsen : (1) Quad alignment specification : <200µm to module axis, <100nm vibration >0.1Hz. <300µrad 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) <200µm 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. …. Rev. Apr. 7, 2008

  38. 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. Rev. Apr. 7, 2008

  39. GDE Dubna Meeting: WGs Rev. Apr. 7, 2008

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