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Abstract

Numerical calculations are presented to show the influence of finite pressure on the vertical stability of shaped tokamaks. High values of epsilon.beta(p) improve the vertical stability of dee-shaped tokamaks but are destabilising for an inverse dee. For highly elongated cross-sections, the pressure effect is well described by a linear dependence of the maximum value of stable internal inductance on epsilon.beta(p), with a coefficient that depends on the geometry and increases with triangularity. Stability diagrams are shown in terms of l(i,crit) versus epsilon.beta(p) for TCV- and DIII-D-like cross-sections. The effects of pressure are significant even in the absence of a surrounding wall. Current profile effects depend critically on the wall configuration: low values of l(i) increase the driving force of the instability, but are stabilising if the wall is sufficiently close.

Additional information

Authors: WARD D J, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);BONDESON A, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);HOFMANN F, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Report: LRP 468/92 EN (1992) 24 pp.
Availability: Available from Confédération Suisse, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, 21 avenue des Bains, 1007 Lausanne (CH)
Record Number: 199310241 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: en
Available languages: en
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