1 / 87

ILC Accelerator Baseline Design (TDR-2): SCRF Cavity and Cryomodule

ILC Accelerator Baseline Design (TDR-2): SCRF Cavity and Cryomodule. Akira Yamamoto KEK/ILC-GDE on behalf of GDE Project Managers and SCRF TA Collaborators Report for Project Advisory Committee (PAC) Review, To be held at KEK, 13 th December, 2012. Acknowledgments.

bunme
Télécharger la présentation

ILC Accelerator Baseline Design (TDR-2): SCRF Cavity and Cryomodule

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. ILC Accelerator Baseline Design (TDR-2): SCRF Cavity and Cryomodule Akira Yamamoto KEK/ILC-GDE on behalf of GDE Project Managers and SCRF TA Collaborators Report for Project Advisory Committee (PAC) Review, To be held at KEK, 13th December, 2012 ILC-PAC SCRF

  2. Acknowledgments • We (GDE-PMs) would thank the ILC-GDE, SCRF collaboration with: • DESY, INFN, CEA-Saclay, LAL-Orsay, CI, CERN, and Industry in Europe, • FNAL, J-LAB, Cornell, SLAC, ANL, LANL, BNL, TRIUMF, and Industry in Americas, • KEK, Kyoto, IUAC, RRCAT, BARC, TTIF, VECC, IHEP, PKU, PAL, KNU, PNU, and Industry in Asia for their worldwide cooperation in TDR Advances in SCRF for ILC

  3. SCRF Reports for PAC TDR2-Chapter 3 • Main Linac Layout • Common layout • Flat and Mountainous topologies • by Marc Ross • SCRF Technology • Cavity and Cryomodule • by Akira Yamamoto • RF Power System • by Shigeki Fukuda ILC-PAC SCRF

  4. Outline • Introduction • Baseline technologies achieved for TDR • Cavity and CM Baseline Design for TDR • Cavity • Production Specification (S-3.2) • Cavity Integration (S-3.3) • Cryomodule • Cavity string and CM Design Incling Quad. (S-3.4) • Cryogenic • Cooling Scheme (S-3.5) ILC-PAC SCRF

  5. Introduction • Progress to establish baseline technologies for ‘TDR’ • Cavity gradient(S0): • Worldwide effort: G = 35 MV/m+/- 20%, satisfying <G> ≥ 35 MV/m • Cavity and Cryomodule(CM) integration (S1): • ‘S1-Global’ verified baseline technologies • Beam acceleration with SCRF CM (S2): • ‘FLASH’ demonstrated ILC beam current and the pulse-duration • “STF-QB’ demonstrated ILC beam pulse-duration ILC-PAC SCRF

  6. Global Plan for SCRF R&D We are here Advances in SCRF for ILC

  7. Configuration: RDR to TDR Cost containment Motivation: • Singleaccelerator tunnel • Smaller damping ring • e+ target at high-energy end, • Cavity G. 31.5 MV/m +/- 20 %, • HLRF and tunnel layout: • Klystron-Cluster on surface (KCS), or • Distributed Klystron in tunnel (DKS) RDR-2007  TDR-2012 5 m Flat-land or Mountainous Tunnel Design Advances in SCRF for ILC

  8. Cavity Gradient: Production Yield, Yearly Progress

  9. Cavity Gradient: Production Yield Progress since 2006 2nd pass statistics for 2010 ~ 2012 period: Production yield: 94 % at > 28 MV/m, Average gradient: 37.1 MV/m - Integrated statistics since 2006 in 2nd pass yield - Max. gradient achieved: > 45 MV/m ILC-PAC SCRF

  10. Gradient Spread of +/- 20% • Average gradient of 35 MV/m • with the spread of 28 ~ 42 MV/m (+/- 20%) • Cavity gradient: higher spread (+ 20%) absorb the lower spread (- 20 %), • Cost-effective production by increasing yield • gaining > 15% (19 %) higher production-yield, • corresponding to ~ 15% saving cavity production cost. • ( investment cost, unchanged) • 75 % at ≥35 MV/m to 94 % at ≥ 28 MV/m • Necessary trade-off with additional RF power • RF power addition required, but it less expensive. ILC-PAC SCRF

  11. Cavity String and CM system integration: demonstrated by S1-Global DESY, Sept. 2010 DESY, FNAL, Jan., 2010 FNAL & INFN, July, 2010 INFN and FNAL Feb. 2010 March, 2010 DESY, May, 2010 June, 2010 ~ Status of ILC

  12. Cavities, Tuners, Couplers in S1-G Cryomodule TESLA Cavity (DESY/FNAL) Tesla-like Cavity (KEK) Slide-Jack Tuner (KEK) Blade Tuner(INFN/FNAL) Saclay Tuner (DESY) TTF-III Coupler (DESY/FNAL/SLAC) STF-II Coupler (KEK) ILC-SCRF-Global-Effort

  13. TESLA (DESY) and TESLA-Like (KEK) Cavity KEK-LC-STF meeting

  14. Variety of Cavity and Tuner Assembly in S1-Global Slide-jack tuner at KEK EXFEL tuner Blade Tuner (originated by INFN) KEK-LC-STF meeting

  15. S1-Global Progress ReportAvailable as an attached manuscript ILC-PAC SCRF

  16. E. Kako, H. Hayano Cavities Performance: Gradient 31.5 MV/m C1 C2 C3 C4 A1 A2 A3 A4 Before cryomodule installation Average 30.0MV/m after cryomodule installation Average 27.7MV/m 7 cavities combined operation Average 26.0MV/m

  17. 7-cavity operation by digital LLRF LLRF stability study with 7 cavities operation at 25MV/m Stability in 6300 sec. Field Waveform of each cavity vector-sum gradient amplitude stability in pulse flat-top phase stability in pulse flat-top - Vector-sum stability: 24.995MV/m ~ 24.988MV/m (~0.03%) - Amplitude stability in pulse flat-top: < 60ppm=0.006%rms - Phase stability in pulse flat-top: < 0.0017 degree.rms Advances in SCRF for ILC

  18. Designs Demonstrated in S1-Global and the Baseline Technology selected for TDR ILC-PAC SCRF

  19. Plug-compatible Conditions Plug-compatible interface established KEK-LC-Meeting

  20. Beam Acceleration Parameters required for ILC-TDR Advances in SCRF for ILC

  21. Progress in SCRF System Tests • DESY: FLASH • SRF-CM string + Beam, • ACC7/PXFEL1 < 32 MV/m > • 9 mA beam, 2009 • 800ms, 4.5mA beam, 2012 • KEK: STF • S1-Global: complete, 2010 • Cavity string : < 26 MV/m> • Quantum Beam : 1 ms • CM1 + Beam, in 2014 • FNAL: NML/ASTA • CM1 test complete • CM2 operation, in 2013 • CM2 + Beam, beyond 2013 Advances in SCRF for ILC

  22. Summary: SCRF Baselines Demonstrated and/or chosen for TDR • Cavity gradient • Achieved 35 MV/m +/- 20 %, and < 37.1 MV/m> with the production yield of 94% • Cavity and CM integration • Demonstrated SCRF technologies available for TDR • Coupler : TTF-III • Tuner: Blade tuner • Magnetic shield : placed inside LHe tank • Beam acceleration • Demonstrated ILC beam parameters • Beam (RF) pulse duration: 1 ms • Beam current: 9 mA ILC-PAC SCRF

  23. Outline • Introduction • Baseline technologies achieved for TDR • Cavity and CM Baseline Design for TDR • Cavity • Production Specification (S-3.2) • Cavity Integration (S-3.3) • Cryomodule • Cavity string and CM Design Incling Quad. (S-3.4) • Cryogenic • Cooling Scheme (S-3.5) ILC-PAC SCRF

  24. Cavity Design Parameters YS-delivered: > 50 MPa -annealed:> 39 MPa P-design: 0.2 Mpa -test:: 0.3 MPa ILC-PAC SCRF

  25. Cavity/Cryomodule Fabrication Material/ Sub-component Cavity Fabrication HeTank Surface Process LHe-Tank Assembly Vertical Test = Cavity RF Test Cryomodule Assembly and RF Test

  26. Cavity Fabrication/Test Process Flow Local repair, if it be economical < 30 mm 2nd pass, if G < 35 MV/m (as of today) 60 % go to 2nd pass ILC-PAC SCRF

  27. Cavity Gradient: Production Yield, Yearly Progress

  28. Fabrication and Surface Treatment Process Parameters to be further optimized micron

  29. Subjects for Further Study • Vertical Test with LHe tank • Production economical, but defects may not be localized with having LHe tank, • Local repairs • More experiences needed to understand the cost-saving, • New definition for production yield including repair, • Mitigation of field emission and radiation • Understand sources and mitigation technology • Establish quantitative evaluation technology ILC-PAC SCRF

  30. Cavity Integration • 9-cell resonator • Input-coupler • TTF-III coupler • Frequency tuners • Blade tuner • He tank • Magnetic shield • Inside He tank ILC-PAC SCRF

  31. Input Coupler Design Specification Design needs to be ready for upgrade ILC-PAC SCRF

  32. Coupler Fabrication and Process • Coupler fabrication • At industry • Coupler Process • At industry or lab. • String Assembly with CM • At lab. ILC-PAC SCRF

  33. Baseline: TTF-III Coupler • Reasons • Much experience at FLASH (DESY), ASTA (Fermilab) • Used in EXFEL • Demonstrating the ILC technical requirement • Less expensive • Subjects for further study beyond TDR • Seeking for further optimum design with fixed (no-bellows) cold-end outer-pipe, referring the KEK coupler design, • Simplifying the assembly process, with keeping less expensive design ILC-PAC SCRF

  34. coupler assembly TTF-III Coupler: various support jigs are required. KEK STF Coupler:self standing

  35. Tuner Design Specification ILC-PAC SCRF

  36. Baseline: Blade Tuner • Reasons • Demonstrating the ILC technical requirements (S1-Global, ASTA) • Less expensive • Subjects for further study beyond TDR • Judgment for MTBF/reliablity and maintain-ability of –pulse-motors and piezo-motors • Seek for a further optimum design to allow accessibility/maintain-ability for the motors, ILC-PAC SCRF

  37. He Tank Design with Blade Tuner Bellows at Center ILC-PAC SCRF

  38. LHe Tank Comparison Lhe tank for Slide-jack Tuner Lhe tank for Blade Tuner KEK-LC-STF meeting

  39. Baseline: LHe tank w/ Blade Tuner • Reasons • Simpler and less expensive than the design with slide-jack tuner, • Subjects for further study beyond TDR • Further simple design for cost-reduction to be comparable with the EXFEL LHe-tank ILC-PAC SCRF

  40. Magnetic Shield Inside LHe Tank Design concept: inside shield + cylindrical end shield outside cylindrical shield inside jacket Conical shield inside endplate Pill-box end-cell shield, outside jacket (may be required for Tesla-Cavity design)

  41. Comparison of Magnetic Shield 16 Components per ca (shield outside 4 Components per Cavity (shield inside) For 2 FNAL Cavities For 2 KEK Cavities

  42. Baseline: Magnetic-Shield Inside • Reasons • Simplest and best shielding effect with the minimum connection-interfaces and holes • Efficient installation work during cavity integration, and minimum work during cavity string assembly • Subjects for further study beyond TDR • Industrialization of magnetic shield cylinder • Conical shield installation for TESLA type cavity having spatial conflict at the end-cell contact to the conical flange ILC-PAC SCRF

  43. Plug-compatible Conditions Plug-compatible interface established KEK-LC-Meeting

  44. Outline • Introduction • Baseline technologies achieved for TDR • Cavity and CM Baseline Design for TDR • Cavity • Production Specification (S-3.2) • Cavity Integration (S-3.3) • Cryomodule • Cavity string and CM Design Incling Quad. (S-3.4) • Cryogenic system • Cooling Scheme (S-3.5) ILC-PAC SCRF

  45. Cavity/Cryomodule Fabrication Material/ Sub-component Cavity Fabrication HeTank Surface Process LHe-Tank Assembly Vertical Test = Cavity RF Test Cryomodule Assembly and RF Test

  46. CM Assembly Type-B module Type-A has 9 cavities and no quadrupole cavities (8) SC quad package 12.652 m (slot length) ILC-PAC SCRF

  47. Cryomodule Design

  48. D. Kostin & E. Kako Cryomodule Gradient Spread and Degradation Observed at DESY and KEK, as of Nov. 2010 PXFEL-1 PXFEL-2 PFEL-3 S1-Global • FLASH: • 3 PXFEL cryomodules • ILC R&D: • S1-Global cryomodule • CM1 (S1-Local @ Fermilab) • Current status: • 12/40 degraded with ~ 20 % TDR ACC & SCRF Guidline

  49. Conduction-Cooled Split-able Quadruple • Advantages; • Q-magnet may be assembled separately, • Keep “best clean” during cavity string assembly • No additional cryostat and cryogenics • Highly accurate alignment without LHe vessel ILC-PAC SCRF

  50. Heat Loads per CM

More Related