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Onset of Resistive Interchange Mode in the Large Helical Device

Satoru SAKAKIBARA, Kiyomasa WATANABE, Hiroshi YAMADA, Yoshiro NARUSHIMA, Taiki YAMAGUCHI¹⁾, Kazuo TOI, Satoshi OHDACHI, Kenji TANAKA, Tokihiko TOKUZAWA, Kazumichi NARIHARA, Kazuo KAWAHATA, Akio KOMORI and LHD Experimental Group

National Institute for Fusion Science

1)

The Graduate University for Advanced Studies

(Received 31 May 2006 / Accepted 28 August 2006 / Published 31 October 2006)

Abstract

The relationship between magnetohydrodynamic (MHD) modes and the linear stability boundary has been investigated by controlling the pressure gradient in the Large Helical Device. Edge plasma pressure was varied by inserting a pump limiter into the plasma, and the onsets of MHD modes were determined. A quantitative comparison between mode onsets and a linear stability index of the resistive interchange mode was performed under the condition of a specific magnetic Reynolds number. The experimental results are consistent within a factor of 2 with a rough estimation of the stability boundary of a resistive low-n mode.

Copyright (c) 2006 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

MHD stability, LHD, movable limiter, resistive interchange mode, magnetic Reynolds number

DOI: 10.1585/pfr.1.049

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References

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This paper may be cited as follows:

Satoru SAKAKIBARA, Kiyomasa WATANABE, Hiroshi YAMADA, Yoshiro NARUSHIMA, Taiki YAMAGUCHI, Kazuo TOI, Satoshi OHDACHI, Kenji TANAKA, Tokihiko TOKUZAWA, Kazumichi NARIHARA, Kazuo KAWAHATA, Akio KOMORI and LHD Experimental Group, Plasma Fusion Res. 1, 049 (2006).