[Table of Contents]

Plasma and Fusion Research

Volume 3, S1014 (2008)

Regular Articles

Observation of Toroidal Flow on LHD
Mikirou YOSHINUMA, Katsumi IDA, Masayuki YOKOYAMA, Kenichi NAGAOKA, Masaki OSAKABE and the LHD Experimental Group
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, 502-5292, Japan
(Received 14 November 2007 / Accepted 29 February 2008 / Published 1 August 2008)

Abstract

In order to investigate the formation of toroidal flow in helical systems, both NBI driven flow and spontaneous toroidal flow were observed in Large Helical Device (LHD). The toroidal flow driven by NBI is dominant in plasma core while its contribution is small near plasma edge. The spontaneous toroidal flow changes its direction from co to counter when the radial electric field is changed from negative to positive at plasma edge. The direction of the spontaneous toroidal flow due to the radial electric field near plasma edge is observed to be opposite to that in plasma core where the helical ripple is small.

Keywords

toroidal flow, spontaneous flow, charge exchange spectroscopy

DOI: 10.1585/pfr.3.S1014

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This paper may be cited as follows:

Mikirou YOSHINUMA, Katsumi IDA, Masayuki YOKOYAMA, Kenichi NAGAOKA, Masaki OSAKABE and the LHD Experimental Group, Plasma Fusion Res. 3, S1014 (2008).