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Vortical, toroidal and compressible motions in 3D MHD simulations of LHD

Published online by Cambridge University Press:  20 December 2006

H. MIURA ,
N. NAKAJIMA ,
T. HAYASHI  and
M. OKAMOTO
H. MIURA
Affiliation:
Theory and Computer Simulation Center, National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan Department of Fusion Science, The Graduate University for Advanced Studies (SOKENDAI), 322-6 Oroshi, Toki, Gifu 509-5292, Japan
N. NAKAJIMA
Affiliation:
Theory and Computer Simulation Center, National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan Department of Fusion Science, The Graduate University for Advanced Studies (SOKENDAI), 322-6 Oroshi, Toki, Gifu 509-5292, Japan
T. HAYASHI
Affiliation:
Division of Theory and Data Analysis, National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan Department of Fusion Science, The Graduate University for Advanced Studies (SOKENDAI), 322-6 Oroshi, Toki, Gifu 509-5292, Japan
M. OKAMOTO
Affiliation:
Theory and Computer Simulation Center, National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan Division of Theory and Data Analysis, National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292, Japan
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Abstract

Direct numerical simulation of fully three-dimensional, compressible and nonlinear magnetohydrodynamic equations in the Large Helical Device is carried out in combination with the passive particle simulation. In the simulation, strong vortical motions are excited by the pressure-driven instability and form the mushroom-like structures of pressure. It is shown by the passive particles analysis that the fluid volumes around the resonant magnetic surfaces experience finite compressibility and toroidal deformation, which are both excited by the strong vortical motions. The passive particles simulation helps us to investigate local structures even for low Fourier wavenumber modes.

Type
Papers
Information
Journal of Plasma Physics , Volume 72 , Issue 6 , December 2006 , pp. 1095 - 1099
Copyright
2006 Cambridge University Press

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