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Analysis of Frequency Shift Due to Lorentz Detuning in TESLA Cavities with Tuners

This report presents the findings from tests conducted on January 29, 2011, focusing on the frequency shift variations in TESLA cavities (C4/Z109, MHI-06) caused by Lorentz detuning. We examined cryomodules with different tuners including blade and slide-jack types, under varying electric fields (29 MV/m and 38 MV/m). The analysis included performance metrics such as rise time and flat top compensation using motor and piezo tuners, highlighting detuning factors affecting acceleration gradients. Results indicate significant variations in detuning across different setups, informing future cavity design.

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Analysis of Frequency Shift Due to Lorentz Detuning in TESLA Cavities with Tuners

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  1. Frequency shift due to Lorentz detuning C4/Z109 (29MV/m) A2/MHI-06 (38MV/m) FB/on, Piezo/off FB/on, Piezo/off 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 2011, January 29

  2. 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 2011, January 29

  3. 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 2011, January 29

  4. Comparison of Detuning Frequency by LFD TESLA cavity Blade tuner TESLA cavity Saclay tuner Tesla-like cavity Slide-jack tuner D AES004 ACC011 Z108 Z109 MHI-05 MHI-07 MHI-06 MHI-09 FNAL DESY KEK 2011, January 29

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