Plasma and Fusion Research

Volume 14, 3402129 (2019)

Regular Articles

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 SEKI1,2), Kunihiro OGAWA1,2), Mitsutaka ISOBE1,2), Masayuki YOKOYAMA1,2), Takeo NISHITANI1), William W. HEIDBRINK1,3), Masaki OSAKABE1,2) and LHD Experiment Group1)
National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan
University of California, Irvine, Irvine, CA 92697, USA
Oak Ridge Institute for Science and Education, Oak Ridge, TN 37830, USA
(Received 10 January 2019 / Accepted 9 May 2019 / Published 11 July 2019)


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.


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

DOI: 10.1585/pfr.14.3402129


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