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Superconducting Accelerating Cryo-Module Tests at DESY

International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) Denis Kostin, MHF-SL, DESY. 21.10.2010. Superconducting Accelerating Cryo-Module Tests at DESY. Overview. Module Test Stand CMTB Module Test Procedure Module Test Results Summary. Cryo Module Test Bench.

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Superconducting Accelerating Cryo-Module Tests at DESY

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  1. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) Denis Kostin, MHF-SL, DESY. 21.10.2010 Superconducting AcceleratingCryo-Module Tests at DESY

  2. Overview • Module Test Stand CMTB • Module Test Procedure • Module Test Results • Summary Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  3. Cryo Module Test Bench Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  4. Module / Cryogenics 12m He gas return pipe 70K shield 4K shield Cavity type TESLA Number of cavities 8 Cavity length 1.038 m Operating frequency 1.3 GHz R/Q 1036 Ω Accelerating Gradient 20..35 MV/m Quality factor 1010 Qext (input coupler) 3×106 Operating temperature 2 K LHe cooling 2K / 31mbar HERA cryoplant is used input coupler 2 phase LHe pipe Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  5. CMTB RF System Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  6. CMTB LLRF System Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  7. Module Gamma Radiation Measurement Gamma detector "DUMP" Gamma detector "GUN" module Two gamma detectors are placed near the beam line on both ends of the module (by the end-caps). Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  8. Module Vacuum System Beam line Module Coupler Common pumping line Ti Sublimation Pump Ion Getter Pump TSP/IGP connected in parallel and IGP used as a vacuum gauge. Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  9. Coupler Technical Interlock 3 times e- (charged particles) light in coupler vacuum light in wave guide (air side) temperature cold ceramic temperature warm ceramic vacuum coupler vacuum cavity bias voltage cryogenic OK low level RF gate on klystron all thresholds are hardware set Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  10. Module Test Procedure (1) Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  11. Module Test Procedure (2) Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  12. Module Test Procedure (3) Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  13. RF Calibration / Test Cavities gradients for the 1.3 ms rectangular pulse RF Power Calibration flat-top RF power pulse evaluated error margins for accelerating gradients in this test are about 10..16%. Rsh/Q=1030, Lcavity=1.035m, Qload=3106, f0=1.3GHz, Pfor5kW, tfill=1300s (for calibration, 500s for flat-top) Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  14. RF Couplers Conditioning Time TSP saturated C1 warm part light IGP vacuum pressure IL limit set to 10-6 mbar TSP saturated Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  15. Module Test Results: PXFEL1 (1) Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  16. Module Test Results: PXFEL1 (2) Flat-top pulse 500+800μs operation at 10 Hz Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  17. Module Test Results: PXFEL1 (3) Module Field Emission vs Accelerating Gradient RF power coupler dynamic losses Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  18. Module Test Results: PXFEL2 (1) Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  19. Module Test Results: PXFEL2 (2) Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  20. Module Test Results: PXFEL3 (1) Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  21. Module Test Results: PXFEL3 (2) Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

  22. Summary • The Cryo Module Test Bench ( CMTB ) was built at DESY to test the accelerating SRF modules and cavities independently from the FLASH operation. CMTB allows the high and low power RF tests, as well as cryogenic tests to be conducted on one SRF module. 9 SRF modules ( including one 3.9 GHz module ) tested until now at CMTB. • 7 superconducting accelerating modules are used now in the FLASH LINAC at DESY. 3 modules were tested at FLASH and 4 modules were tested at CMTB facility. • First three XFEL prototype modules PXFEL1,2,3 were assembled in team-work with XFEL Cold Linac Partners ( IHEP / Beijing, CEA-IRFU / Saclay, IN2P3-LAL / Orsay, INFN / Milano, CIEMAT / Madrid, DESY ) and tested at module test stand CMTB at DESY. • Modules tested with equal cavity RF power distribution as well as single cavities with only one cavity on resonance at time. The cavities were tested with the flat-top RF pulse with 0.5 ms rise time and 0.8 ms flat-top. The own quality factors Q0 measurements were done using the cryogenic losses measurement on the CMTB, modules radiation measurements done as well on the both ends of the module ( gun / dump side ). • In PXFEL1 cavities gradients from 27 to 36 MV/m are reached, module operation with average gradient of 30 MV/m using tailored RF power distribution is possible. PXFEL1 is used in FLASH (ACC7). • Modules PXFEL2 and 3 suffered from some cavities degradation: one cavity in PXFEL2 and two in PXFEL3 did not reach 20 MV/m. Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 21.10.2010

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