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Magnetic Field Dependence of Transition to High Electron Density Phase in a Linear Plasma Device NUMBER

Hiroki HACHIKUBO, Atsushi OKAMOTO, Takaaki FUJITA, Hideki ARIMOTO, Ryosuke OCHIAI, Minami SUGIMOTO and Kento IIZUKA

Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan

(Received 6 January 2020 / Accepted 10 May 2020 / Published 2 July 2020)

Abstract

High electron density discharge mode was observed in the downstream of a magnetic beach, so called test region in a linear plasma device with an electron cyclotron resonance source. A model for formation of the high density phase based on electron motion along the field line was proposed. The model reproduced the tendency that the duration of the high density phase was longer for the higher magnetic field in the test region in the experiment. Some discrepancies between the experiment and the model were newly found in the experiment with detailed scan in the magnetic field in the test region with the modified time evolution of the magnetic field.

Copyright (c) 2020 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

linear plasma device, electron cyclotron resonance, ion saturation current, magnetic mirror effect

DOI: 10.1585/pfr.15.2401042

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