北京正负电子对撞机中的束流光电子不稳定性研究

高能储存环中的正电子束流辐射出光子,打在束流管道壁上产生光电子并形成电子云;多束团正电子束流与电子云相互作用,有可能发生的不稳定性,称为束流光电子不稳定性.这种不稳定性有可能在下一代高能正负电子对撞机的束流中发生,因此对这种束流不稳定性的研究,也有很重要的实际意义.文章讨论了在北京正负电子对撞机(BEPC)上开展的束流光电子不稳定性实验和模拟分析研究.

Study on Beam Photoelectron Instability in BEPC

A beam photoelectron instability may arise in high energy storage rings when 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 important for the particle factories as there are strong multi bunch positron beams to be operated. The experimental observations are carried out in the Beijing Electron Positron Collider (BEPC) under the cooperation between IHEP, China and KEK, Japan, and the simulation studies are presented in this paper.