Stability of localized MHD perturbations in confinement systems with closed magnetic field lines |
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Authors: | V. V. Arsenin |
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Affiliation: | (1) Institute of Nuclear Fusion, Russian Research Centre Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182, Russia |
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Abstract: | Conditions are determined for the stability of a finite-pressure plasma against perturbations localized near a magnetic field line in a magnetic confinement system without average minimum-B. The marginal stability (ω2=0) is achieved at the pressure profile p∝U ?5/3 (where $U = oint {frac{{dl}}{B}}$ ), provided that the pressure is lower than a certain critical value above which an unstable incompressible mode in which the displacement as a function of the coordinate along the field line has zeros appears at some magnetic field line. |
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