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Access to second stability region for coupled peeling-ballooning modes in tokamaks

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JournalPhysics of Plasmas
DatePublished - Mar 1999
Issue number3
Volume6
Number of pages4
Pages (from-to)873-876
Original languageEnglish

Abstract

The peeling mode restricts access to the second stability region of the ideal ballooning mode at the tokamak plasma edge. Using a two-dimensional, high toroidal mode number eigenmode code employing a model tokamak equilibrium, it is shown that a window to second stability exists for a sufficiently deep magnetic well. The different mode structures of the various eigenmode branches are studied. In particular, when access to second ballooning stability exists, a ballooning mode perturbation at the first stability boundary can extend deep into the plasma core, and then instability is likely to result in large scale loss of plasma energy. (C) 1999 American Institute of Physics. [S1070-664X(99)02703-2].

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