[Table of Contents]

Plasma and Fusion Research

Volume 10, 3402053 (2015)

Regular Articles

Study of Nonlinear Behavior of Low-Frequency MHD Mode Caused by Transition of Radial Electric Field in LHD
Chanho MOON, Katsumi IDA, Tokihiko TOKUZAWA, Kenji TANAKA, Mikirou YOSHINUMA, Tatsuya KOBAYASHI, Shigeru INAGAKI1), Kimitaka ITOH and LHD Experiment Group
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi 509-5292, Japan
1)
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
(Received 1 December 2014 / Accepted 1 April 2015 / Published 26 May 2015)

Abstract

The response of low-frequency magnetic fluctuations in a transition of radial electric field (Er) is investigated in the edge region of LHD plasmas. Consequently, the amplitude of a magnetic fluctuation with f ≈ 2 - 5 kHz is suddenly enhanced at the transition timing of Er, and then disappeared after the transition of Er. Furthermore, it is found that the amplitude of Hα signals is enhanced, corresponding to the abrupt diminishing of the magnetic fluctuation with f ≈ 2 - 5 kHz.

Keywords

MHD mode, magnetic fluctuation, density fluctuation, radial electric field, LHD

DOI: 10.1585/pfr.10.3402053

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This paper may be cited as follows:

Chanho MOON, Katsumi IDA, Tokihiko TOKUZAWA, Kenji TANAKA, Mikirou YOSHINUMA, Tatsuya KOBAYASHI, Shigeru INAGAKI, Kimitaka ITOH and LHD Experiment Group, Plasma Fusion Res. 10, 3402053 (2015).