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CM-2 Commissioning

This presentation discusses the commissioning process for the CM-2 cryomodule, which is a Type 3+ ILC type Cryomodule with 8 cavities. The process includes cold commissioning, setting up motor temperature, tuning to resonance, and on-resonance conditioning. The presentation also mentions the milestones achieved so far and the application of the cryomodule to LCLS-II.

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CM-2 Commissioning

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  1. CM-2 Commissioning Elvin Harms LCLS-II Weekly Meeting 12 March 2014

  2. Introduction • CM-2 is • Type 3+ ILC type Cryomodule • 8 cavities (1.3 GHz) built by industry • Vertical and Horizontal tests at Fermilab & JLab (good to 35 MV/m) • Cryomodule assembled at Fermilab • first ILC type cryomodule which may reach average gradient specification of 31.5 MV/m • Designed for pulsed operation • Main accelerating device for ASTA • Expect beam tests in FY2015

  3. Commissioning Process • Prerequisites • cryomodule installed • pipes welded and certified leak tight • pressure tests successful • vacuum circuits leak tight (beam tube, coupler, insulating vacuum) • any necessary warm conditioning completed • cooldown • Single cavity powering • Power all cavities together, characterize system performance • Follow-on studies E. Harms APT Seminar 14 January 2014

  4. Commissioning Process E. Harms APT Seminar 14 January 2014

  5. Cold Commissioning – Single Cavity • Tune cavity to resonance • Map out and set QL • System calibrations, calculate gradient, k • On-resonance conditioning • Determine peak performance • Final (high power) LLRF calibration • Lorentz Force Detuning Compensation set-up • Document dark current, x-rays vs. gradient • Dynamic Heat Load measurements (Q0) E. Harms APT Seminar 14 January 2014

  6. Setting Up Motor temperature Df ~ 240 MHz Motor steps Goal 1.30 GHz Start here Tuning to Resonance E. Harms APT Seminar 14 January 2014

  7. Setting Up Setting QL 3-3.5 E6 E. Harms APT Seminar 14 January 2014

  8. Cold Commissioning – On-resonance conditioning Conditioning Sequencer • 20 ms to 1.3 ms pulse width • 1-2 Hz repetition rate • Peak power 1 MW (narrow pulse width) or < 25 MV/m • Monitor • Vacuum • Field Emission (3 points) • PMT • Coupler window temperatures • Automated process (mostly) Cavity #4 Conditioning E. Harms APT Seminar 14 January 2014

  9. Lorentz Force Detuning Off On E. Harms APT Seminar 14 January 2014

  10. Peak Gradient 27 February 2014: CM-2 Cavity 3 achieves 31.5 MV/m (Administrative limit) 5 Hz, 1.6 ms pulse width, LFDC Active E. Harms APT Seminar 14 January 2014

  11. Dark Current/X-rays Threshold ≥ 20 MV/m E. Harms APT Seminar 14 January 2014

  12. Performance to Date ILC Milestone CM2 installed at ASTA

  13. Timeline • Cryomodule installed in NML/ASTA – April 2013, • Warm coupler conditioning (one cavity at a time) – 9 May to 18 June 2013 • Cooldown – 23 October to 11 November 2013 • Begin cold operation, Cavity 1 only – 13 November 2013 • Cavity 1 complete (13 November - 30 January) • Cavity 2 complete ( 31 January - 15 February, 16 days) • Cavity 3 complete ( 24 February – 4 March, 9 days) • Cavity 4 complete ( 4 – 10 March, 6 days) • Cavity 5 begin next week (beam line installation access this week) • Cavity 6 • Cavity 7 • Cavity 8 E. Harms APT Seminar 14 January 2014

  14. Application to LCLS-II Cryomodules • Some facets of commissioning are more pertinent to pulsed/high peak power operation • coupler conditioning (necessary?) • peak gradient • Q0/DHL measurement critical • Good to start with single cavity testing, but necessary as experience gained? • CM2 a good check on component performance/reliability • Visitors welcome to come and observe/participate • Follow-on ideas welcome

  15. Summary • CM2 cold commissioning since December • Half of the Cavities are now characterized • Pace is picking up, estimate ~2 weeks/cavity • Performance as hoped for so far • Full cryomodule testing in May? • Open to visitors and additional studies

  16. Thanks

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