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

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

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

Superconducting Accelerating Cryo-Module Tests at DESY 4 Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) K shield Cavity typeTESLA Number of cavities8 Cavity length1.038 m Operating frequency1.3 GHz R/Q1036 Ω Accelerating Gradient MV/m Quality factor10 10 Q ext (input coupler)3×10 6 Operating temperature2 K LHe cooling 2K / 31mbar HERA cryoplant is used 12m 4K shield input coupler 2 phase LHe pipe He gas return pipe Module / Cryogenics

Superconducting Accelerating Cryo-Module Tests at DESY 5 Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) CMTB RF System

Superconducting Accelerating Cryo-Module Tests at DESY 6 Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) CMTB LLRF System

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

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

Superconducting Accelerating Cryo-Module Tests at DESY 9 Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 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 Coupler Technical Interlock

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

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

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

Superconducting Accelerating Cryo-Module Tests at DESY 13 Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) evaluated error margins for accelerating gradients in this test are about  %. RF Power Calibration R sh /Q=1030 , Lcavity=1.035m, Qload=3  10 6, f 0 =1.3GHz, Pfor  5kW, t fill =1300  s (for calibration, 500  s for flat-top) flat-top RF power pulse Cavities gradients for the 1.3 ms rectangular pulse RF Calibration / Test

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

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

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

Superconducting Accelerating Cryo-Module Tests at DESY 17 Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) measured (CMTB)XFEL specification RF power, kW K losses, W K losses, W RF power coupler dynamic losses Module Field Emission vs Accelerating Gradient Module Test Results: PXFEL1 (3)

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

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

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

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

Superconducting Accelerating Cryo-Module Tests at DESY 22 Denis Kostin, MHF-SL, DESY. International Workshop on Linear Colliders 2010 (ECFA-CLIC-ILC Joint Meeting) 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 Q 0 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.