Mechanism of Electron Cloud Clearing with Electrodes

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Abstract

Clearing electrodes have been successfully used to remove the ion from the vacuum chamber in many electron accelerators, especially in electron synchrotron light source. Electron cloud caused beam instabilities and vacuum pressure rise are becoming more and more important with the increasing beam intensity in recent years. In this paper we have explored the mechanism to clear the electron cloud by using the clearing electrode in case of the Spallation Neutron Source (SNS) accumulator ring, where strong multipacting could happen at median clearing fields.