Simulated Lorentz Force Detuning Compensation With A Double Lever Tuner On A Dreassed ILC/1.3 GHz Cavity At Room Temperature

Abstract

Pulsed SRF linacs with high accelerating gradients ex-perience large frequency shifts caused by Lorentz force detuning (LFD). A piezoelectric actuator with a resonance control algorithm can maintain the cavity frequency at the nominal level, thus reducing the RF power. This study uses a double lever tuner with a piezoelectric actuator for compensation and another piezoelectric actuator to simulate the effects of the Lorentz force pulse. A double lever tuner has an advantage by increasing the stiffness of the cavity-tuner system, thus reducing the impact of LFD. The tests are con-ducted at room temperature and with a dressed 1.3 GHz 9-cell cavity.