Plasma and Fusion Research

Volume 12, 1203039 (2017)

Rapid Communications

Impacts of External Momentum Torque on Impurity Particle Transport in LHD
Masanori NUNAMI1,2), Masahiko SATO1), Motoki NAKATA1,2), Shinichiro TODA1), Hideo SUGAMA1,2), Masayuki YOKOYAMA1,2) and Hiroyuki YAMAGUCHI1)
1)
National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
2)
The Graduate University for Advanced Studies, Toki, Gifu 509-5292, Japan
(Received 14 July 2017 / Accepted 26 August 2017 / Published 16 October 2017)

Abstract

Particle transport processes of impurity ions in a multi-ion-species plasma in the Large Helical Device are investigated by neoclassical transport simulations. While the quasi-linear gyrokinetic analyses indicate that the anomalous contribution of the impurity particle transport is radially inward-directed, it is found that the external momentum sources can cause the existence of the electron root with positive radial electric field and outward-directed neoclassical particle flux of the impurity ion.

Keywords

impurity transport, Large Helical Device, neoclassical transport

DOI: 10.1585/pfr.12.1203039

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