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Author(s):
T. Yamagishi
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Title:
Kinetic Approach to Long Wave Length Modes in Rotating Plasmas
Date of publication:
Mar. 1992
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Key words:
Radial electric field, plasma rotation, electric potential, drift kinetic solution, electromagnetic perturbations, Krook collision term, ballooning mode, drift resistive ballooning mode, passing particles, trapped particles, energetic particles, centrifugal force, fluid flow shear, disspative trapped electron mode
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Abstract:
Stability of low frequency long wave length modes is studies by a kinetic approach in rotating Maxwellian plasmas. In the rigid rotator model, the centrifugal force due to the plasma rotation strongly destabilizes the ballooning modes particularly when the Mach number is close to unity. The fluid flow shear weakly stabilizes the ballooning mode. Energetic particles are effective to stabilize the ballooning mode particurarly in the high-beta region even in the rotating plasmas . The electric potential induced from the radial electric field increases the particle trapping rate for e Phi > 0. For Phi < 0 as in tokamaks, electron trapping rate increases, which destabilizes the dissipative trapped electron mode.
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