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NBI Beam Ion Distributions in the Presence of Magnetic Islands in Helical Plasmas

Hiroyuki YAMAGUCHI and Sadayoshi MURAKAMI

Department of Nuclear Engineering, Kyoto University, Kyoto 615-8530, Japan

(Received 30 November 2015 / Accepted 18 April 2016 / Published 30 June 2016)

Abstract

Neutral beam injection (NBI) heating simulations of Large Helical Device (LHD) plasma in the presence of magnetic islands are performed using a drift kinetic equation solver, GNET. A magnetic perturbation that causes a magnetic island with poloidal and toroidal mode numbers (m, n) = (1, 1) is considered. It is found that the spatial distribution of beam ions for counter-tangential NBI is significantly modified near the magnetic island, exhibiting a strong dependency on the mode phase of the island. The changes in the velocity space distribution and orbits of the transition particles imply an enhancement in the ripple transport of beam ions near the magnetic island.

Copyright (c) 2016 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

Large Helical Device, magnetic island, energetic particle, simulation, Monte Carlo, GNET

DOI: 10.1585/pfr.11.2403094

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