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The low (beta) stability of a toroidal circular cross-section tokamak is reanalysed. Although the structure of the unstable modes can be considerably modified by toroidal coupling, the overall stability picture is well represented by the so-called straight tokamak model, with the major exception that the internal kink, although stabilised by toroidal effects, still has a free-boundary counterpart, the toroidal kink mode. The toroidal kink is unstable for q(o) < q(c) < = 1 and is destabilised by toroidal coupling, having a growth rate that scales with inverse aspect ratio a/R to the power 2q(s), where q(s) is the integer part of the edge safety factor q(s).

Additional information

Authors: TURNBULL A D, General Atomics, P.O. Box 85608, San Diego, California 92138-5608 (US);TROYON F, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne, avenue des Bains, 21, 1007 Lausanne (CH)
Bibliographic Reference: Report: LRP 379/89 EN (1989)
Availability: Available from Confédération Suisse, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, 21 avenue des Bains, 1007 Lausanne (CH)
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