high power tests in the s1-global cryomodule

E. KAKO (KEK) 2011' Feb 28 TTC meeting, Milano

Global Design Effort

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High Power Tests in the S1-Global Cryomodule



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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)

International Team for S1-Global



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Collaborative work for Cryomodule Assembly

Cavity string assembly (2010, Jan.)

Tuner assembly (2010, Feb.)

Coupler assembly (2010, Mar.)

KEK Cavity string assembly (2010, Mar.)



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Collaboration for Cryomodule Tests

Tuner performance tests (2010, July)

Cavity processing (2010, Sept.)

Lorentz detuning tests (2010, Oct.) Dynamic loss meas. (2010, Nov.)



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Outline• Cavity performance• Dynamic loss measurements• Lorentz detuning & Mechanical vibration• 7-cavity operation by one Klystron



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Blade Tuner (FNAL) Saclay Tuner (DESY)

Slide-Jack Tuner (KEK)

TTF-III Coupler (DESY/FNAL) STF-II Coupler (KEK)

TESLA Cavity (DESY/FNAL)Tesla-like Cavity (KEK)

Cavities, Tuners, Couplers in S1-G Cryomodule

Comparisonof

Performance



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2 cavities from FNAL 2 cavities from DESY

8 Cavities for S1-Global (ave. 30 MV/m)4 cavities from KEK

Vertical Test Results of 8 Cavities



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MHI-09MHI-07

MHI-06MHI-05AES004 ACC011 Z108 Z109

FNAL DESY KEK

Comparison of cavity performance ave. Eacc,max VT : 30 MV/m1 cav : 27 MV/m7 cav : 26 MV/m

D

C

D : DetuneC : Coupler

D



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UX-ray

Cryomodule - C Cryomodule - A

DX-ray

MX-ray

C1 C2 C3 C4 A1 A2 A3 A4

Degradationof Eacc,max

TunerTroubleTuner

Trouble

CouplerVacuum

Up-stream Down-stream

Comparison of cavity performance



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Comparison of cavity performanceDegradationof Eacc,max

C2

C3

C4

C1

A1 A2

A3A4

at 25MV/m

at 25MV/m



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Qo values measured by dynamic loss

Dynamic loss at input coupler

(Detuning at 32 MV/m)TTF-III : 0.5 W / 4 couplersSTF-II : 4.6 W / 4 couplers

C1 A3

A2

A2

C4

4 cav.

7 cav.



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Frequency shift due to Lorentz detuning

C4/Z109 (29MV/m) A2/MHI-06 (38MV/m)

FB/on, Piezo/off FB/on, Piezo/off

Pre-detuningby motor tuner& piezo tunerwith DC voltage

Compensationby piezo tuner inpulsed operation

Flat TopFlat Top

Rise Time Rise Time

200~500 Hz 2~3 kHz



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Cryomodule-C Cryomodule-A

Total : f = -0.90, -0.83 (Eacc)2

Rise Time : f = -0.46, -0.31 (Eacc)2

Flat Top : f = -0.43, -0.51 (Eacc)2

TESLA cavity + Blade tuner Tesla-like cavity + Slide-jack tuner

Total : f = -0.70, -0.66 (Eacc)2

Rise Time : f = -0.56, -0.49 (Eacc)2

Flat Top : f = -0.14, -0.17 (Eacc)2




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Cryomodule-C Cryomodule-ATESLA cavity + Saclay tuner Tesla-like cavity + Slide-jack tuner

Total : f = -1.22, -1.00 (Eacc)2

Rise Time : f = -0.49, -0.41 (Eacc)2

Flat Top : f = -0.73, -0.59 (Eacc)2

Total : f = -0.69, -0.79 (Eacc)2

Rise Time : f = -0.55, -0.50 (Eacc)2

Flat Top : f = -0.14, -0.29 (Eacc)2



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Comparison of Detuning Frequency by LFD

MHI-09MHI-07

MHI-06MHI-05AES004

ACC011Z108 Z109

FNAL DESY KEK

TESLA cavityBlade tuner

TESLA cavitySaclay tuner

Tesla-like cavitySlide-jack tuner

A2/MHI-06

A3/MHI-07 A4/MHI-09

Mechanical Vibration Modes by Piezo Sensors

A1/MHI-05

20 MV/m

18 MV/m33 MV/m

33 MV/m

1.5 ms,5 Hz,operation

E. KAKO (KEK) 2011' Feb 28

16TTC meeting, Milano Global Design Effort

4-Cavity Operation in Cryomodule-AFB/on, Piezo/off, ave. Eacc = 28.4 MV/m

A1/MHI-05 A2/MHI-06 A3/MHI-07 A4/MHI-09

23.7 MV/m 25.6 MV/m 31.1 MV/m 23.0 MV/m

540Hz 220Hz 325Hz 210Hz

Dominant mechanical vibration mode

Eacc =



345Hz179Hz

509Hz356Hz

204Hz

Vpiezo = +40V, 1 kHz (1 pulse)

260Hz

322Hz

448Hz

245, 252Hz

313Hz436Hz

C1/AES004 C2/ACC011

C3/Z108 C4/Z109

Mechanical Vibration Modes kicked by Piezo tuner

(Low RF Power meas.)



4-Cavity Operation in Cryomodule-CFB/on, Piezo/off, ave. Eacc = 22.5 MV/m

C1/AES004 C2/ACC011 C3/Z108 C4/Z109

24.6 MV/m 21.3 MV/m 16.8 MV/m 27.0 MV/m

179Hz 204Hz 260Hz 245Hz

Dominant mechanical vibration mode

Eacc =





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Required rf power for 8-cav. operation

MHI-09MHI-07

MHI-06MHI-05AES004 ACC011 Z108 Z109

FNAL DESY KEK

26 MV/m

24 MV/m

18 MV/m

29 MV/m

20 MV/m

38 MV/m

33 MV/m

23 MV/m

Stable operating Eacc (individual cavity) Calc. ave. EaccC : 25 MV/mA : 29 MV/mC&A : 27 MV/m



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7-cavity operation in Cryomodule-C&A

A1 : 16 MV/m A2 : 39 MV/m A3 : 34 MV/m A4 : 22 MV/m

C1 : 26 MV/m

C3 : 18 MV/m

C4 : 30 MV/m

C : ave. 25 MV/m

A : ave. 27 MV/m

Ave. Eacc = 26.2 MV/m ; FB/on, Piezo/on, 1299.900 MHz

100Hz/div 200Hz/div 200Hz/div 100Hz/div

100Hz/div 100Hz/div 100Hz/div

C2 : Detune



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Stability of Detuning Frequency Cryomodule - C

Cryomodule - A

Piezo/on

Piezo/on

C1 C4C2(Detune)

C3

A1 A2 A3 A4

33.2Hz(rms)

12.4Hz(rms)

38.6Hz(rms)

4.6Hz(rms)

7.3Hz(rms)

7.3Hz(rms)

9.9Hz(rms)

2h



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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.



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END

high power tests in the s1-global cryomodule

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