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Study on Fast Deuteron Diagnostics Method Using Fast ³He Visible Spectra in the Large Helical Device Deuterium Plasma

Kento KIMURA, Hideaki MATSUURA, Chujo ITOH, Yasuko KAWAMOTO¹⁾, Tetsutaro OISHI^1,2), Motoshi GOTO^1,2), Kunihiro OGAWA^1,2), Takeo NISHITANI³⁾, Mitsutaka ISOBE^1,2) and Masaki OSAKABE^1,2)

Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan

1)

National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan

2)

Department of Fusion Science, The Graduate University for Advanced Studies, SOKENDAI, 322-6 Oroshi-cho, Toki 509-5292, Japan

3)

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

(Received 1 July 2022 / Accepted 1 December 2022 / Published 30 January 2023)

Abstract

Fast ion diagnostic is one of the most crucial plasma diagnostics for nuclear fusion investigation. A new diagnostic method for fast ions has been proposed using visible spectra of ³He produced by a deuteron-deuteron reaction. This diagnostic method has a better energy resolution than methods using neutron/γ-ray and is superior to conventional spectroscopy in measuring high energy (MeV order) ions. This diagnostic method has been predicted using numerical analysis for ITER, but no verification experiments have been performed yet. In this study, we examined the measurability of this diagnostic method in the large helical device (LHD) deuterium plasma. Although very dependent on the measurement geometry and the spectrometer performance, it may be possible to measure the fast ³He visible spectrum.

Copyright (c) 2023 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

large helical device, deuterium plasma, velocity distribution function, charge-exchange spectroscopy, visible light spectra

DOI: 10.1585/pfr.18.1403002

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