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Evaluation of an Energetic Particle Profile Using a Tangential-FIDA Diagnostic in the Large Helical Device

Yutaka FUJIWARA¹⁾, Shuji KAMIO¹⁾, Hiroyuki YAMAGUCHI¹⁾, Alvin V. GARCIA³⁾, Luke STAGNER⁴⁾, Hideo NUGA¹⁾, Ryosuke SEKI^1,2), Kunihiro OGAWA^1,2), Mitsutaka ISOBE^1,2), Masayuki YOKOYAMA^1,2), Takeo NISHITANI¹⁾, William W. HEIDBRINK^1,3), Masaki OSAKABE^1,2) and LHD Experiment Group¹⁾

1)

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

2)

SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan

3)

University of California, Irvine, Irvine, CA 92697, USA

4)

Oak Ridge Institute for Science and Education, Oak Ridge, TN 37830, USA

(Received 10 January 2019 / Accepted 9 May 2019 / Published 11 July 2019)

Abstract

A tangential Fast-Ion D Alpha (FIDA) diagnostic is applied to the Large Helical Device (LHD) in order to observe energetic distribution of toroidal circulating energetic particles which are produced by tangential Negative Neutral Beams (NNB). A perpendicular Positive NB (PNB) is used as the diagnostic probe beam of the tangential-FIDA diagnostic in this observation geometry. In order to assess the appropriateness of the tangential-FIDA diagnostic, the experimental result was compared with a Silicon-diode-based Fast Neutral Analyzer (Si-FNA) which was installed on the same line of sight. As a result of the comparison, the tangential-FIDA and the Si-FNA experimental data obtained good linearity in the energy region from 60 keV to 180 keV. In addition, an enhanced FIDASIM was applied for analyzing the FIDA on the three-dimensional magnetic configuration fusion device.

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

Keywords

energetic particle, FIDA, FIDASIM, LHD, three-dimensional magnetic configuration

DOI: 10.1585/pfr.14.3402129

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