E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 1 Lorentz Force Detuning Eiji Kako (KEK, Japan)

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Presentation transcript:

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 1 Lorentz Force Detuning Eiji Kako (KEK, Japan)

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 2 Outline Observation of Lorentz force detuning Compensation results of LFD Tuner performance in S1-G Summary

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 3 Z107 Cavity, Saclay Tuner, Eacc = 35 MV/m AC81 Cavity, Saclay Tuner, Eacc = 35 MV/m Z86 Cavity, Blade Tuner, Eacc = 23 MV/m  f = -650 Hz Flat-top = 0.8 ms  f = -800 Hz  f = -300 Hz A) B) C) Eacc = 31.5 MV/m, Flat-top = 1.0 ms for ILC, (QL = 3. x 10 6 ) A)  f = Hz,  = - 72 o B)  f = Hz,  = - 75 o C)  f = Hz,  = - 74 o Observation of Lorentz Force Detuning L. Lilje (DESY) C. Pagani (INFN)

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 4 L. Lilje (DESY)  f = 500~700 Hz Flat-top = 0.8 ms Observation of Lorentz Force Detuning at DESY

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 5 Pre-detuning of +350Hz by motor tuner Compensation of -315Hz by piezo tuner TESLA CavityTESLA-like Cavity Comparison of Detuning Frequency (  f ) Eacc = 31.5 MV/m Flat-top = 1.0 ms Observation of Lorentz Force Detuning at STF Experiment at STF-1

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 6 Cryomodule-6 (DESY) Compensation results of LFD at DESY  f = 50 Hz cav5 ? L. Lilje (DESY)  f = 50 ~ 150 Hz (Eacc > 30 MV/m)

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 7 Optimization of Piezo Drive Pulse 1. Waveform 2.Amplitude 3.Frequency 4.Delay time  f < +/- 50 Hz in wide parameters Compensation of Lorentz Force Detuning at STF  f < +/- 30 Hz in best case

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 8 K. Yamamoto (KEK) Stability of LFD compensation at STF  f = -40 Hz

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 9 Compensation of Lorentz Force Detuning Z107 Cavity, Saclay Tuner, Eacc = 35 MV/m AC81 Cavity, Saclay Tuner, Eacc = 35 MV/m Flat-top = 0.8 ms A) B) Z86 Cavity, Blade Tuner, Eacc = 23 MV/m Flat-top = 0.8 ms  f = ~ 30 Hz C)  f = ~ 30 Hz  f = ~ 50 Hz C. Pagani (INFN) L. Lilje (DESY)

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 10 Recent LFD control results at FNAL Y. Pischalnikov (FNAL) W. Schappert (FNAL) This method is under preparation for studies of Lorentz force detuning in S1-G cryomodule.

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 11 S. Noguchi (KEK) Error of Lorentz detuning compensation QL = 2. ~ 3. x % reduction ;  f < 20~30 Hz 2% reduction ;  f < 30~50 Hz

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 12 Error of Lorentz detuning compensation Shin Michizono (KEK)

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 13 S1-Global Cryomodule 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 (KEK)

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort , July Tuner performance tests in collaboration with INFN / FNAL / KEK Low RF power tests in S1-Global

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 15 Hysteresis of Piezo Tuner (Cryo-C/A) Tuner performance tests in collaboration with INFN / FNAL / KEK

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 16 Single pulse response (Cryo-C/A) Tuner performance tests in collaboration with INFN / FNAL / KEK

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 17 Piezo stroke by pulse response  f = 300~ MV/m  f = 700~ MV/m Blade TunerSaclay TunerSlide-Jack Tuner

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 18 Mechanical Vibration Modes (Cryo-C/A) Difference is very clear. 1.TESLA cavity + Blade tuner 2.TESLA cavity + Saclay tuner 3.Tesla-like cavity + Slide-jack tuner KEK DESY FNAL Q L = 3. x 10 6

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 19 Propagation of Mechanical Vibration Pt  Vpiezo Pt  Vpiezo  A1/A2 (KEK) C3/C4 (DESY) C1/C2 (FNAL) A3/A4 (KEK) 10 o /div. 250Hz, 40V 200Hz, 40V 330Hz, 400V 535Hz, 400V A1 A2 C3C1 A3 A4 C2C4 100ms/div. 1 o /div.

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 20 Q L of Variable Input Coupler 3. X 10 6 Cryomodule - CCryomodule - A Q L = 2.0 ~ 8. x 10 6 (FNAL) Q L = 1.3 ~ 4. x 10 6 (DESY) Q L = 2.0 ~ 4. x 10 6 (KEK)

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 21 List of studies in S1-G cryomodule tests High gradient performance Observation of Lorentz force detuning Compensation of Lorentz force detuning Dynamic heat loss measurement LLRF control in 8-cavity operation DRFS Sept. ~ Dec. in 2010 ; LLRF control with LFD compensation in 8-cavity operation

E. KAKO (KEK) 2010' Sept. 10 KEK Global Design Effort 22 SUMMARY In the horizontal tests of one-cavity operation, LFD compensation error of  f < 50 Hz was demonstrated in different types of piezo tuner. Results of the piezo-tuner performance will be directly compared in high power tests of the S1-G cryomodule, very soon.