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Numerical Simulation for Enhancement of H⁻ Production in the DC Arc-Discharge Hydrogen Negative Ion Source for Medical Use

Shota YAMADA, Hisashi KITAMI¹⁾, Shinji NOMURA¹⁾, Yasushi AOKI¹⁾, Kazuo HOSHINO and Akiyoshi HATAYAMA

Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan

1)

Sumitomo Heavy Industries, Ltd., 19 Natsushima, Yokosuka, Kanagawa 237-8555, Japan

(Received 9 January 2019 / Accepted 9 September 2019 / Published 29 October 2019)

Abstract

A multi-cusp DC arc-discharge hydrogen negative ion (H⁻) source has been developed for proton cyclotron, which is used for Boron Neutron Capture Therapy (BNCT). The purpose of this study is to understand the dependence of H⁻ production on the operation parameters and optimize H⁻ production in the source. In this paper, we focus on the effect of magnetic filter field on H⁻ volume production. The H⁻ density in the extraction region has been numerically estimated in the three patterns of magnetic filter field by using 3D electron transport code and 0D rate equations. The result suggests that the magnetic filter field which is localized in the vicinity of the extraction region is suitable for the efficient H⁻ volume production.

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

Keywords

boron neutron capture therapy, hydrogen negative ion source, volume production, magnetic filter field, 3D electron transport simulation, 0D rate equation

DOI: 10.1585/pfr.14.3401160

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