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Effects of the Stochasticity on Transport Properties in High-β LHD

Yasuhiro SUZUKI, Kiyomasa WATANABE, Hisamichi FUNABA, Satrou SAKAKIBARA, Noriyoshi NAKAJIMA, Nobuyoyshi OHYABU and LHD experiment group

National Institute for Fusion Science, Toki 509-5292, Japan

(Received 22 December 2008 / Accepted 27 May 2009 / Published 13 July 2009)

Abstract

Effects of the stochasticity of magnetic field lines on transport properties are investigated. In a high-β LHD plasma, the structure of field lines in the peripheral region becomes stochastic by finite-β effects but the finite pressure gradient exists in that region. The radial diffusion coefficient and the Kolmogorov length of stochastic field lines are estimated. In the stochastic region, the radial diffusion of stochastic field lines becomes large and the Kolmogorov length becomes short due to increasing β. In that region, the radial heat transport becomes large due to the stochasticity of field lines.

Copyright (c) 2009 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

LHD, high-β, HINT2, stochasticity, radial heat diffusivity

DOI: 10.1585/pfr.4.036

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This paper may be cited as follows:

Yasuhiro SUZUKI, Kiyomasa WATANABE, Hisamichi FUNABA, Satrou SAKAKIBARA, Noriyoshi NAKAJIMA, Nobuyoyshi OHYABU and LHD experiment group, Plasma Fusion Res. 4, 036 (2009).