| National Institutes of Natural Science, National Institute for Fusion Science Department of Helical Plasma Research, Fundamental Physics Simulation Research Division |
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 NIFS WEB |
| National Institutes of Natural Science, National Institute for Fusion Science Department of Helical Plasma Research, Fundamental Physics Simulation Research Division |
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| NIFS WEB |
Influences of the pressure-driven instability on plasma confinement in
LHD is studied by means of the direct numerical simulation of the compressible,
nonlinear and fully three-dimensional MHD equations. Green surface represents
the isosurface of the pressure. The pressure contours are shown on a poloidal
cross-section. The thin lines represent the stream lines. The vortical
motions associated with the pressure-driven instability deform the pressure
and form the mushroom-like struc-tures of the pressure. Since the streamlines
are inclined into the toroidal direction, the toroi-dal flow is excited
as strong as the poloidal (vortical) motions.