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A particle beam from accelerator such as synchrotron has been applied not only to physics experiments but also medical applications. In the slow extraction which extract beam from a synchrotron during a large number of turns, the accelerated beam is blown up and slowly deflect and separate the beamwith the electrostatic septum. The electrostatic septum consists of electrode and septum for separating the electric field between extraction and circulating beam. Generally, the wire or plate is used for septum. In this case, the beam loss hit by septum is inevitable. Consequently, the limitation of the extraction efficiency and the beam power caused by suppressing the radioactivation of devices. We propose the nondestructive electrostatic septum. The multiple electrodes arrange surround the beam and produce the electric field for separation and deflect the beam. There are no materials in the beam orbit area. This method is referred to ionization profile monitor. This will be reported introduction of our proposed non-destructive electrostatic septum.

Proposal of Non-destructive Device for Slow Extraction