| Paper | Title | Page |
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WEPPD035 |
Distributed Beam Loss Monitor Based on Cherenkov Radiation in Optical Fiber | |
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| A distributed beam loss monitor based on Cherenkov effect for both electron and positron accelerators was developed. The main advantage of a distributed monitor compared to conventional ones is that a long optical fiber section can be used instead of a large number of conventional local beam loss monitors. This type of beam loss monitor operation is based on detection of Cherenkov radiation generated in optical fiber by secondary electrons and positrons from electromagnetic shower. In our experiments Cherenkov light was detected by photomultiplier tube (PMT). The signal arrival time shows the location of losses. Monitor spatial resolution is limited by signal lengthening due to intermode dispersion in optical fiber. The distributed beam loss monitor has just been started to use at VEPP-5 linac lattice. In the experiments with 20 m long optical fiber we achieved spatial resolution of 2 m. In order to improve spatial resolution additional collimator is needed to select photons with different propagating angles. It will allow to achieve spatial resolution of 0.5 m. Moreover, the collimator will make it possible to use longer optical fiber sections. We also suggest similar techniques for detection of electron (or positron) losses due to Touschek effect in storage rings. | ||