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  • 1
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    Ballooning stability of axisymmetric plasmas with sheared equilibrium flows (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A WKB theory is formulated for large-n ballooning modes in axisymmetric, toroidal plasmas with sheared equilibrium flows. The validity of the standard ballooning respresentation is severely restricted in the presence of sheared toroidal flow, despite the fact that to leading order in (1/n), where n is the azimuthal number, the eigenmode equation contains only derivatives along a field line. Necessary and sufficient conditions for stability are obtained in a high-beta ordering for rigid toroidal rotation as well as field-aligned flows.
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids B (ISSN 0899-8221); 1; 2207-221
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Ballooning stability of anisotropic, rotating plasmas (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The linearized equation of motion is given in a Lagrangian representation for a rotating plasma with anisotropic pressure. A WKB theory is developed for large-n ballooning modes in an axisymmetric configuration with field-aligned and rigid toroidal flows. In the presence of field-aligned flows, it is shown that a resonance occurs which is strongly suggestive of a generalized mirror instability. In the presence of toroidal rotation, a possible stabilizing effect is identified for P(normal) greater than P(parallel). Finally, as a special case of the theory, the necessary and sufficient conditions for stability in a static, anisotropic plasma are obtained.
    Keywords: PLASMA PHYSICS
    Type: Physics of Fluids B (ISSN 0899-8221); 2; 2346-235
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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