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High Power Tests in the S1-Global Cryomodule

High Power Tests in the S1-Global Cryomodule. International Team for S1-Global. A. Bosotti, C. Pagani, R. Paparella, P. Pierini, INFN (Italy) K. Jensch, D. Kostin, L. Lilje, A. Matheisen, W.-D. Moeller, M. Schmoekel, P. Schilling, H. Weise, DESY (Germany)

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High Power Tests in the S1-Global Cryomodule

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  1. High Power Tests in the S1-Global Cryomodule TTC meeting, Milano Global Design Effort

  2. International Team for S1-Global A. Bosotti, C. Pagani, R. Paparella, P. Pierini, INFN (Italy) K. Jensch, D. Kostin, L. Lilje, A. Matheisen, W.-D. Moeller, M. Schmoekel, P. Schilling, H. Weise, DESY (Germany) T. Arkan, S. Barbanotti, M. Battistoni, H. Carter, M. Champion, A. Hocker, R. Kephart, J. Kerby, D. Mitchell, Y. Pischalnikov, T.J. Peterson, M. Ross, W. Schappert, B. Smith, FNAL (USA) C. Adolphsen, C. Nantista, SLAC (USA) M. Akemoto, S. Fukuda, K. Hara, H. Hayano, N. Higashi, E. Kako, H. Katagiri, Y. Kojima, Y. Kondo, T. Matsumoto, S. Michizono, T. Miura, H. Nakai, H. Nakajima, K. Nakanishi, S. Noguchi, N. Ohuchi, T. Saeki, M. Satoh, T. Shishido, T. Shidara, T. Takenaka, A. Terashima, N. Toge, K. Tsuchiya, K.Watanabe, S. Yamaguchi, A. Yamamoto, Y. Yamamoto, K. Yokoya, KEK (Japan) TTC meeting, Milano Global Design Effort

  3. Collaborative work for Cryomodule Assembly Tuner assembly (2010, Feb.) Cavity string assembly (2010, Jan.) KEK Cavity string assembly (2010, Mar.) Coupler assembly (2010, Mar.) TTC meeting, Milano Global Design Effort

  4. Collaboration for Cryomodule Tests Cavity processing (2010, Sept.) Tuner performance tests (2010, July) Lorentz detuning tests (2010, Oct.) Dynamic loss meas. (2010, Nov.) TTC meeting, Milano Global Design Effort

  5. Outline • Cavity performance • Dynamic loss measurements • Lorentz detuning & Mechanical vibration • 7-cavity operation by one Klystron TTC meeting, Milano Global Design Effort

  6. Cavities, Tuners, Couplers in S1-G Cryomodule TESLA Cavity (DESY/FNAL) Tesla-like Cavity (KEK) Slide-Jack Tuner (KEK) Blade Tuner (FNAL) Saclay Tuner (DESY) Comparison of Performance TTF-III Coupler (DESY/FNAL) STF-II Coupler (KEK) TTC meeting, Milano Global Design Effort

  7. Vertical Test Results of 8 Cavities 2 cavities from FNAL 2 cavities from DESY 4 cavities from KEK 8 Cavities for S1-Global (ave. 30 MV/m) TTC meeting, Milano Global Design Effort

  8. Comparison of cavity performance ave. Eacc,max VT : 30 MV/m 1 cav : 27 MV/m 7 cav : 26 MV/m C D D AES004 ACC011 Z108 Z109 MHI-05 MHI-07 D : Detune C : Coupler MHI-06 MHI-09 FNAL DESY KEK TTC meeting, Milano Global Design Effort

  9. Comparison of cavity performance Cryomodule - C Cryomodule - A Degradation of Eacc,max Tuner Trouble Coupler Vacuum Tuner Trouble C1 C2 C3 C4 A1 A2 A3 A4 U X-ray M X-ray D X-ray Up-stream Down-stream TTC meeting, Milano Global Design Effort

  10. Comparison of cavity performance Degradation of Eacc,max A1 A2 C1 C2 at 25MV/m A3 C4 A4 C3 at 25MV/m TTC meeting, Milano Global Design Effort

  11. Qo values measured by dynamic loss 7 cav. C4 A2 A2 4 cav. C1 A3 Dynamic loss at input coupler (Detuning at 32 MV/m) TTF-III : 0.5 W / 4 couplers STF-II : 4.6 W / 4 couplers TTC meeting, Milano Global Design Effort

  12. Frequency shift due to Lorentz detuning C4/Z109 (29MV/m) A2/MHI-06 (38MV/m) Pre-detuning by motor tuner & piezo tuner with DC voltage Rise Time Rise Time Flat Top Flat Top Compensation by piezo tuner in pulsed operation 200~500 Hz FB/on, Piezo/off 2~3 kHz FB/on, Piezo/off TTC meeting, Milano Global Design Effort

  13. Frequency shift due to Lorentz detuning Cryomodule-C Cryomodule-A TESLA cavity + Blade tuner Tesla-like cavity + Slide-jack tuner Total : D f = -0.90, -0.83 (Eacc)2 Rise Time : D f = -0.46, -0.31 (Eacc)2 Flat Top : D f = -0.43, -0.51 (Eacc)2 Total : D f = -0.70, -0.66 (Eacc)2 Rise Time : D f = -0.56, -0.49 (Eacc)2 Flat Top : D f = -0.14, -0.17 (Eacc)2 TTC meeting, Milano Global Design Effort

  14. Frequency shift due to Lorentz detuning Cryomodule-C Cryomodule-A TESLA cavity + Saclay tuner Tesla-like cavity + Slide-jack tuner Total : D f = -1.22, -1.00 (Eacc)2 Rise Time : D f = -0.49, -0.41 (Eacc)2 Flat Top : D f = -0.73, -0.59 (Eacc)2 Total : D f = -0.69, -0.79 (Eacc)2 Rise Time : D f = -0.55, -0.50 (Eacc)2 Flat Top : D f = -0.14, -0.29 (Eacc)2 TTC meeting, Milano Global Design Effort

  15. Comparison of Detuning Frequency by LFD TESLA cavity Blade tuner TESLA cavity Saclay tuner Tesla-like cavity Slide-jack tuner AES004 Z108 Z109 MHI-05 MHI-07 ACC011 MHI-06 MHI-09 FNAL DESY KEK TTC meeting, Milano Global Design Effort

  16. Mechanical Vibration Modes by Piezo Sensors 1.5 ms, 5 Hz, operation A1/MHI-05 20 MV/m A2/MHI-06 33 MV/m A3/MHI-07 A4/MHI-09 33 MV/m 18 MV/m TTC meeting, Milano Global Design Effort

  17. 4-Cavity Operation in Cryomodule-A FB/on, Piezo/off, ave. Eacc = 28.4 MV/m Dominant mechanical vibration mode 540Hz 220Hz 325Hz 210Hz A1/MHI-05 A2/MHI-06 A3/MHI-07 A4/MHI-09 Eacc = 23.7 MV/m 25.6 MV/m 31.1 MV/m 23.0 MV/m TTC meeting, Milano Global Design Effort

  18. Mechanical Vibration Modes kicked by Piezo tuner (Low RF Power meas.) Vpiezo = +40V, 1 kHz (1 pulse) C1/AES004 C2/ACC011 179Hz 204Hz 509Hz 345Hz 356Hz 260Hz 245, 252Hz C3/Z108 C4/Z109 322Hz 313Hz 448Hz 436Hz TTC meeting, Milano Global Design Effort

  19. 4-Cavity Operation in Cryomodule-C FB/on, Piezo/off, ave. Eacc = 22.5 MV/m Dominant mechanical vibration mode 179Hz 204Hz 260Hz 245Hz C1/AES004 C2/ACC011 C3/Z108 C4/Z109 Eacc = 24.6 MV/m 21.3 MV/m 16.8 MV/m 27.0 MV/m TTC meeting, Milano Global Design Effort

  20. Required rf power for 8-cav. operation Stable operating Eacc (individual cavity) Calc.ave. Eacc C : 25 MV/m A : 29 MV/m C&A : 27 MV/m 38 MV/m 33 MV/m 29 MV/m 26 MV/m 24 MV/m 23 MV/m 18 MV/m 20 MV/m AES004 ACC011 Z108 Z109 MHI-05 MHI-07 MHI-06 MHI-09 FNAL DESY KEK TTC meeting, Milano Global Design Effort

  21. 7-cavity operation in Cryomodule-C&A Ave. Eacc = 26.2 MV/m ; FB/on, Piezo/on, 1299.900 MHz C : ave. 25 MV/m 100Hz/div 100Hz/div 100Hz/div C2 : Detune A : ave. 27 MV/m 200Hz/div 200Hz/div 100Hz/div 100Hz/div C1 : 26 MV/m C3 : 18 MV/m C4 : 30 MV/m A1 : 16 MV/m A2 : 39 MV/m A3 : 34 MV/m A4 : 22 MV/m TTC meeting, Milano Global Design Effort

  22. Stability of Detuning Frequency Cryomodule - C Piezo/on C1 C2 (Detune) C3 C4 12.4Hz (rms) 33.2Hz (rms) 38.6Hz (rms) 2h Cryomodule - A A1 A2 A3 A4 Piezo/on 4.6Hz (rms) 7.3Hz (rms) 7.3Hz (rms) 9.9Hz (rms) TTC meeting, Milano Global Design Effort

  23. SUMMARY • Ave. Eacc of 26 MV/m was successfully demonstrated • in the 7-cavity operation by the vector-sum control. • Two cavities showed the performance degradation of • the Eacc,max from vertical tests to cryomodule tests. • The x-rays radiation levels were higher than others. • Two frequency tuning systems did not work correctly. • Qo values measured by dynamic rf losses were lower • than 1x1010 in each cavity. This cause might be due to • electron loading with strong x-rays radiation. • Frequency shifts by Lorentz detuning in the KEK cavities • were much less than those in the TESLA-type cavities. • This is due to the stiff structure in the KEK cavities. • Stability of the detuning frequency in the KEK cavities • was much better than those in the TESLA-type cavities. TTC meeting, Milano Global Design Effort

  24. END TTC meeting, Milano Global Design Effort

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