Abstract

A fast and real time luminosity monitor system will be used in the BEPC-II (Beijing Electron Positron Collider, China). Photons generated in radiative Bhabha scattering at the interaction point are transformed into charged particles, and then the luminosity of each bunch pair is measured through collecting the Cherenkov light produced by charged particles in fused silica. The whole process happening in the detector is simulated. The physics acceptance and detection threshold with the monitor accuracy of 1% are set based on the simulation spectra of photoelectron yield calibrated by e− beam data.

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