[Table of Contents]

Plasma and Fusion Research

Volume 6, 2403123 (2011)

Regular Articles

MHD Equilibrium Analysis with Anisotropic Pressure in LHD
Yoshimitsu ASAHI1), Yasuhiro SUZUKI1,2), Kiyomasa WATANABE1,2) and Wilfred A. COOPER3)
1)
The Graduate University for Advanced Studies, 322-6 Oroshi-cho, Toki 509-5292, Japan
2)
National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
3)
Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas, Association Euratom-Suisse, CH1015 Lausannne, Switzerland
(Received 23 December 2010 / Accepted 9 May 2011 / Published 11 August 2011)

Abstract

The effects of anisotropic pressure on MHD equilibrium are investigated, particularly focused on the position of the magnetic axis. MHD equilibria are numerically calculated under anisotropic pressure conditions using an extension of the VMEC code which is widely applied to obtain three dimensional MHD equilibria. This code is called ANIMEC. A bi-Maxwellian model was invoked in this code in order to treat anisotropic pressure driven by energetic particles without any inconsistency. To investigate the properties of the plasma with p∥ > p⊥, numerical computations under various conditions are performed with a LHD magnetic configuration using the ANIMEC code. Comparisons of the plasma behavior between an analytical model that considers p∥ and p⊥ to be constant on each flux surface and ANIMEC numerical results will be discussed.

Keywords

MHD equilibrium, anisotropic pressure, high-beta plasma, LHD

DOI: 10.1585/pfr.6.2403123

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This paper may be cited as follows:

Yoshimitsu ASAHI, Yasuhiro SUZUKI, Kiyomasa WATANABE and Wilfred A. COOPER, Plasma Fusion Res. 6, 2403123 (2011).