Electromechanical System for Lorentz Force Compensation

摘要

The cavity is the main element of each linear accelerator used for high-energy physics purpose. The resonant frequency of cavities depends on its shape. Due to the pulse operation they are deformed by dynamic Lorentz force caused by accelerating electromechanical field. The paper will describe the recent developments of tuning system dedicated for cavity shape compensation. The system base on multilayer piezoelectric stacks. The active elements will work at temperature of 2K, high vacuum and irradiated environment. Hitherto, the performed experiments shows that the actuators might successfully work in such a demanding surrounds for requested lifetime of 10~(10) cycles. The presented detuning system is not only strongly desirable but also mandatory when the superconducting cavities will be operated with accelerating field gradient above 25MV/m. The experiments of the system are done in linear accelerator VU-V FEL which is founded at DESY-Hamburg, Germany. The results of work will be used also for next generation of superconducting linear colliders as X-FEL and ILC.