Optical fiber Cherenkov detector for beam current monitoring

The results obtained in the calculation of an optical fiber Cherenkov detector for accelerated beam current monitoring are presented. The technique of beam parameter monitoring is based on Cherenkov radiation excitation by accelerated electrons in the optical fiber. The formulas for calculation of the optical power and time dependence of Cherenkov radiation pulses are given. The detector sensitivity and time resolution dependence on the fiber material characteristics are investigated. Parameters of a 10- mu m one-mode quartz optical fiber detector for the free electron laser photoinjector are calculated. The structure of a monitoring system with the optical fiber Cherenkov detector is considered. Possible applications of this technique are discussed, and some recommendations are given.<>