EXPERIMENTAL STUDY ON THE SLIDING SHORT CONTACTS AS A RESULT OF A THEORETICAL INVESTIGATION ON THE CHOPPER-500 COAXIAL RESONATOR

work we present the experimental study of the sliding short contacts used in the tuneable coaxial resonators, usually employed for particle beam choppering operations. In particular, the case of the Chopper-500 λ/4 coaxial resonator is considered. The frequency tuning is obtained by the movement of a sliding short circuit connecting the inner and outer conductors of the resonator. The current flowing in this sliding short is a limiting factor to the maximum voltage applied to the Chopper electrodes. Starting with the theoretical approach of the evaluation of the maximum current of this short, a simple experimental set-up has been developed to test the RF contacts. The experimental results of these test bench measurements and the simulation by a proper electromagnetic solver, will be provided in this paper.