Study on beam photoelectron instability in BEPC

A beam photoelectron instability may arise in high energy storage rings whe n the multibunch positron beam interacts with the photoelectrons which are produced in the beam tube by synchrotron radiation. This instability gives rise to a big interest for the accelerator physicists in recent years as a new mechanism has been involved in this phenomenon study. It is very import ant for the particle factories as there are strong multi-bunch positron bea ms to be operated. The experimental observations art carried out in the Bei jing Electron Positron Collider (BEPC) under the cooperation between IHEP, China and KEK, Japan, and the simulation studies are presented in this pape r.