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Stabilization of the resistive shell mode in tokamaks

R. Fitzpatrick and A.Y. Aydemir

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The stability of current-driven external-kink modes is investigated in a tokamak plasma surrounded by an external shell of finite electrical conductivity. According to conventional theory, the ideal mode can be stabilized by placing the shell sufficiently close to the plasma, but the non-rotating `resistive shell mode`, which grows as the characteristic L/R time of the shell, always persists. It is demonstrated, using both analytic and numerical techniques, that a combination of strong edge plasma rotation and dissipation somewhere inside the plasma is capable of stabilizing the resistive shell mode. This stabilization mechanism is similar to that found recently by Bondeson and Ward (1994), except that it does not necessarily depend on toroidicity, plasma compressibility or the presence of resonant surfaces inside the plasma. The general requirements for the stabilization of the resistive shell mode are elucidated

PACS

52.55.Tn Ideal and resistive MHD modes; kinetic modes

52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)

52.25.Fi Transport properties

52.55.Fa Tokamaks, spherical tokamaks

52.35.Py Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)

52.40.Hf Plasma-material interactions; boundary layer effects

Subjects

Plasma physics

Dates

Issue 1 (January 1996)



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