[Table of Contents]

Plasma and Fusion Research

Volume 8, 1402123 (2013)

Regular Articles

Rotation of Interchange Instability in the Large Helical Device
Yuki TAKEMURA, Satoru SAKAKIBARA1), Kiyomasa WATANABE1), Katsuji ICHIGUCHI1), Katsumi IDA1), Yasuhiro SUZUKI1), Satoshi OHDACHI1), Yoshiro NARUSHIMA1), Ichihiro YAMADA1), Kenji TANAKA1), Hiroshi YAMADA1) and LHD Experiment Group1)
The Graduate University for Advanced Studies, Gifu 509-5292, Japan
1)
National Institute for Fusion Science, Gifu 509-5292, Japan
(Received 5 March 2013 / Accepted 17 June 2013 / Published 26 September 2013)

Abstract

The rotation of resistive interchange instabilities excited in the periphery of plasmas compared to plasma flows under various plasma conditions in the Large Helical Device. The observed magnetohydrodynamic modes exhibit nominal rotation in the electron diamagnetic direction in the laboratory frame. We assumed that the ion (electron) flows consist of the E × B and ion (electron) diamagnetic drift flows. These drift flows were individually evaluated and geometrically compensated using a finite beta equilibrium. Experiments with different neutral beam injection conditions and different electron densities show that the frequencies of the observed modes were quantitatively consistent with those of the electron flow.

Keywords

interchange instability, helical plasma, mode frequency, plasma flow, heliotron

DOI: 10.1585/pfr.8.1402123

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This paper may be cited as follows:

Yuki TAKEMURA, Satoru SAKAKIBARA, Kiyomasa WATANABE, Katsuji ICHIGUCHI, Katsumi IDA, Yasuhiro SUZUKI, Satoshi OHDACHI, Yoshiro NARUSHIMA, Ichihiro YAMADA, Kenji TANAKA, Hiroshi YAMADA and LHD Experiment Group, Plasma Fusion Res. 8, 1402123 (2013).