Nick Walker DESY MAC

Transcription

1 Nick Walker DESY MAC

2 XFEL X-Ray Free-Electron Laser DESY ILC Project Group Accelerator Experimentation Behnke, Elsen, Walker (chair) WP 15, 16 WP 4-7 Accelerator Physics and Design WP 6 High Gradient Cavities Cryo Modules Scientific Program Detector WP 11 Stabilisation, Vibration WP 7 Diagnostics WP 4,5 project represents a joint venture between M and F groups WP 28,29 Operability, Reliability, Controls GAN WP 8 Computing LLRF

3 ILC R&D: SCRF Technology Collaboration SCRF (via XFEL, TTF-VUV [FLASH]) still remains DESY s ILC focus. ~20 GeV linac based on TESLA technology XFEL X-Ray Free-Electron Laser

4 XFEL Synergy WP structure for XFEL project

5 XFEL Synergy Direct 1-1 synergy with ILC

6 XFEL Synergy Significant overlap with ILC

7 XFEL Synergy Potential relevance to ILC

8 TESLA Test Facility (TTF) Focus of the TESLA Collaboration (~12 years) Represents ~140 M M investment Currently unique facility in the world TTF linac (VUV-FEL, FLASH) a test-bed for both European XFEL and ILC Full system integration experience for SCRF linac cf presentations from Schreiber and Honkavaara

9 TESLA 9-Cell 9 Cavity R&D Leak check Frequency Tuning Damage Layer Removal Furnace treatments Final Frequency Tuning Final Surface Preparation Final Cleaning Bake-out C Low-Power Acceptance Test Tank Welding Assembly for High-Power Operation High-Power Testing Established after 10 years R&D Emphasis on QA/QC Reliable transfer to industry High Gradient Programme still a focus

10 Cavity R&D Leak check Frequency Tuning Damage Layer Removal Furnace treatments Final Frequency Tuning Final Surface Preparation Final Cleaning Bake-out C Low-Power Acceptance Test Tank Welding Assembly for High-Power Operation High-Power Testing Critical Steps Electropolishing ( µm) 800 C C furnace treatment Electropolishing (20-50 µm) High-pressure rinsing

11 DESY Results from DESY & KEK Q 0 E acc MV/m New cavity production (30 cavities) will be put through EP Significant increase in statistics Specification / fine tuning of EP parameters ( XFEL) Module 6 (35 MV/m cryomodule) High gradient programme part of XFEL R&D

12 Module 6 Begin assembly NOW! The question is not can we build a 35MV/m cryomodule? but How many cavities do we have to build to do it? Cavities (high-powered horizontal test): AC70 AC76 AC81 Z87 Z83 Z85 Z92 Z90 35 MV/m 35 MV/m 36 MV/m 34 MV/m 32 MV/m 32 MV/m 32 MV/m* 25 MV/m 32.6 MV/m Assembly will be used as XFEL industrial example ILC colleagues from FNAL, JLAB and KEK will also be present to take part in assembly Complete module will be on new test stand this Autumn

13 DESY Cavity R&D Highlights DESY DESY Fabrication from large grain or single-crystal Nb discs (idea from JLAB) ( cost?) EP at Company (training) large-grain nine-cell cavities under fab. Other research topics: Optimisation of cavity fab. process (e.g. welding preparation) Qualification of other Nb vendors R&D funded by XFEL project

14 LLRF

15 Cryomodule (CM) Variants XFEL will use a so-called generation III+ module Part of global collaboration for ILC type IV module (to be constructed by FNAL) Main DESY emphasis is on - industrialisation - reliability - cost optimisation XFEL X-Ray Free-Electron Laser

16 Baseline Klystrons Specification: 10MW MBK 1.5ms pulse 65% efficiency Thales CPI Toshiba XFEL X-Ray Free-Electron Laser Baseline ILC recommended baseline cf presentation by Choroba

17 SC Quadrupole Vibration On-going ILC programme to characterise cryomodule vibration spectrum Existing and new data indicate CM is internally very rigid amplification of quad support over CM motion ~10%

18 SC Quadrupole Vibration laser interferometer based measurements planned for CM9 and CM10 (next year) Will take data on Module Test Stand to characterise influence of RF pulse (expect none) He flow rate (possible source of noise)

19 Input to RDR ILC Cost Estimate Original TESLA TDR + new XFEL updated numbers still most accurate estimates available for ILC main linac technology DESY currently producing ILC Main Linac Tech. updated cost estimate based on BCD WBS TESLA TDR scaled to 2006 Euros Feed in experience and updates from XFEL costing exercise Original DESY TDR site being used as one of the ILC European Sample Sites (together with CERN) European ILC cost breakdown will be supplied by end July (Vancouver GDE meeting) Will eventually be compared to US and Asian (KEK) estimates

20 Non-SCRF Tech. ILC activities Centres around beam dynamics studies

21 Non-SCRF Tech. ILC activities Centres around beam dynamics studies Damping Ring collective effects: - Fast Ion Instability in e- ring - Electron cloud effects in e+ ring

22 Non-SCRF Tech. ILC activities Centres around beam dynamics studies Undulator-based Polarised e+ source Estimates of target and capture section activation Spin transport studies (applicable to e- also) Low-energy polarimeter studies Participation in SLAC

23 Non-SCRF Tech. ILC activities Centres around beam dynamics studies BDS Simulation studies of post-linac halo collimation efficiency in the presence of errors

24 Non-SCRF Tech. ILC activities Centres around beam dynamics studies Low Emittance Transport Simulations Start-to-end emittance tuning simulations (DFS etc.) Ground-motion and feedback studies

25 Development of ILC Simulation Tools Almost all simulations are based on the MERLIN C++ class library DESY now has strong team to support tool development Emerging collaboration with Cockcroft Institute, FNAL, etc.

26 Operations and Availability Collaborating with SLAC on MATLAB availability code benchmarking against TTF-VUV and HERA data code development availability studies Machine Protection Issues understanding failure modes (simulations of RF failures etc. in Main Linac) good contact to equivalent XFEL groups worrying about similar problems GAN Development of Multi-Purpose Virtual Laboratory for remote operations

27 DESY Involvement in GDE Management Nick Walker EUR regional lead accelerator physicist GDE Executive Committee member Chair RDR Management board Wilhelm Bialowons EUR regional Cost Engineer Installation Technical System Co-lead Management board member Lutz Lilje Main Linac System Area co-lead Dieter Proch Cavity Package Technical System co-lead Stefan Simrock Controls Technical System co-lead Eckhard Elsen Operations & Availability Technical System co-lead..and not to forget Ferdi Willeke chair of ILC MAC

28 Future Plans Participate (play a leading role) in a new- generation SCRF Infrastructure for high- gradient cryomodule production FP7 initiative within the TESLA Technology Collaboration context Looking to CERN to host new infrastructure Details just beginning to be sorted out Looking to F division for DESY manpower Consolidate beam dynamics activities Other possibilities being considered

29 Summary DESY ILC project has a diversified programme and is very active (despite resource limitations) XFEL ILC synergy in Main Linac Technology remains DESY s largest contribution to the ILC TTF (TTF-VUV FLASH!) ) still a unique facility for the ILC and will remain so for a few years Have formed a new young beam dynamics group which is now coming up to speed DESY is well represented within the GDE and continues its commitment to the ILC