Electron-Cloud Dynamics in High-Intensity Rings

Electron cloud is one of the main limitations in high-intensity rings. Electrons generated and accumulated inside the beam’s pipe form an "electron cloud" that interacts with the circulating charged-particle beam. With a sizeable number of electrons, these interactions can cause instability, loss of the beam, and the growth of emittance. At the same time, the vacuum pressure will rise due to the desorption of electrons. This presentation gives an overview of the mechanism and dynamics of typical electron multipacting in various magnetic fields, and suggests mitigation measures for different beams.