[Table of Contents]

Plasma and Fusion Research

Volume 9, 3403134 (2014)

Regular Articles

Three-Dimensional Numerical Analysis of Pressure Driven Mode in RMP-Imposed LHD Plasma
Katsuji ICHIGUCHI1,2), Yasuhiro SUZUKI1,2), Masahiko SATO1), Yasushi TODO1,2), Satoru SAKAKIBARA1,2), Satoshi OHDACHI1,2) and Yoshiro NARUSHIMA1,2)
1)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
2)
The Graduate University of Advanced Study, Department of Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
(Received 15 November 2013 / Accepted 24 July 2014 / Published 17 September 2014)

Abstract

Property of pressure driven modes in Large Helical Device (LHD) plasmas with a resonant magnetic perturbation (RMP) is numerically studied. Particularly, we analyze three-dimensional (3D) RMP effects on the linear magnetohydrodynamic (MHD) stability of the modes. For this purpose, 3D numerical codes are utilized for both calculations of an equilibrium including an RMP generating an m = 1/n = 1 magnetic island and the stability of the perturbations resonant at the ι = 1 surface. Here, m and n are the poloidal and the toroidal mode numbers, respectively, and ι denotes rotational transform. Owing to the RMP, the pressure driven mode is localized around the X-point of the island. The type of the mode structure changes from the interchange type to the ballooning type. This property is attributed to the fact that the equilibrium pressure gradient is larger at the X-point than at the O-point.

Keywords

MHD stability, resonant magnetic perturbation (RMP), Large Helical Device (LHD), magnetic island, pressure driven mode

DOI: 10.1585/pfr.9.3403134

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This paper may be cited as follows:

Katsuji ICHIGUCHI, Yasuhiro SUZUKI, Masahiko SATO, Yasushi TODO, Satoru SAKAKIBARA, Satoshi OHDACHI and Yoshiro NARUSHIMA, Plasma Fusion Res. 9, 3403134 (2014).