Proposal of Non-destructive Device for Slow Extraction

Abstract

Particle beams from accelerators such as synchrotrons have been used in physics experiments and in medical applications. In a slow extraction scheme that extracts beams from a synchrotron over many turns, the accelerated beam is slowly blown up, deflected, and separated by an electrostatic septum. The electrostatic septum creates an electric field and separates an extraction beam using electrodes and a septum. Generally, a wire or plate is used for the septum and beam loss caused when passing through it is inevitable. Consequently, the extraction efficiency and beam power are limited because of the beam loss and the device's radio-activation. We newly propose a non-destructive electrostatic septum, where multiple electrodes are arranged surrounding the beam and produce an electric field that deflects and separates the beam. This device does not involve any materials in the beam orbit area. We introduce our proposed non-destructive electrostatic septum and discuss a few simulation studies.