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Abstract

The aim of this ideal MHD stability study is to clarify the operational limits imposed by vertical, kink and ballooning stability for tokamaks with elongation from 2 to 3. It is found that the beta limit of highly elongated tokamaks increases with triangularity. As a function of elongation, the limit shows a maximum for k values close to 2.5. The n = 1 and ballooning limits fall weakly at higher elongation. However, vertical stability for high elongation requires operation at low inductance and this causes a more significant decrease of the n = 1 beta limit. At high elongation, the beta limit is set entirely by n = 0 and n = 1 stability. Finite pressure is clearly favourable for vertical stability at high elongation.

Additional information

Authors: ERIKSSON G, Uppsala University (SE);BONDESON A, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH);WARD D J, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH);HOFMANN F, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH);VILLARD L, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH)
Bibliographic Reference: Paper presented: 19th EPS Conference on Controlled Fusion and Plasma Physics, Innsbruck (AT), June 29 - July 3, 1992
Availability: Available from (1) as Paper EN 36864 ORA
Record Number: 199210700 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en