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Global Instability Structure in a Linear Beam Confinement System

Kojiro SEKIGUCHI, Takahiro URANO, Shuya IWATA, Gaku SAKAI, Ryo MATSUMOTO and Toshiki TAKAHASHI

Graduate School of Science and Technology, Gunma University, Kiryu 376-8515, Japan

(Received 28 September 2018 / Accepted 9 December 2018 / Published 24 January 2019)

Abstract

We investigate instabilities of electron beam particles confined in a cylindrical chamber using a 3- dimensional full particle simulation. The global structure of electron beam plasma changes within 1 μs, and deforms to those formed by the instabilities such and the sausage and kink instabilities. The azimuthal mode of the electron density on the midplane of beam plasma is analyzed and the amplitude of mode number of 1 or more increases at 0.2 μs. It was also found that the temporal change of the electron density on the geometric axis is caused by the plasma oscillation.

Copyright (c) 2019 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

full particle simulation, electron density, Fourier analysis, azimuthal mode, plasma oscillation

DOI: 10.1585/pfr.14.2401018

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