Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
Regular Articles
Analysis of NB Fast-Ion Loss Mechanisms in MHD Quiescent LHD Plasmas
Hideo NUGARyohsuke SEKIKunihiro OGAWAShuji KAMIOYutaka FUJIWARAHiroyuki YAMAGUCHIMasaki OSAKABEMitsutaka ISOBESadayoshi MURAKAMIMasayuki YOKOYAMA
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2021 Volume 16 Pages 2402052

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Abstract

Neutral beam (NB) fast-ion loss mechanisms in the large helical device (LHD) are investigated by the combination of the neutron measurement, the classical slowing-down simulation, and the neo-classical guiding center orbit following simulation. It is found that the neo-classical transport provides little contribution to the loss of tangentially injected NB fast-ions. For perpendicularly injected NB fast-ions, the neo-classical transport has more than 40% contribution to the NB fast ion loss. These results indicate that there are other loss mechanisms dominant in LHD plasmas. The charge exchange loss is one of the plausible candidates for the loss mechanism.

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© 2021 by The Japan Society of Plasma Science and Nuclear Fusion Research
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