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Abstract

This paper investigates the ideal MHD stability limits of a tokamak device of aspect ratio 10 and circular cross-section, superimposed on a L = 3 external helical field, in order to reduce the plasma current required to sustain the rotational transform at the plasma edge at finite beta. This combination gives access to the second stable regime, where both the ballooning modes and the n = 1 external modes are stabilised. For values of beta(*) greater than 1.5 %, the limit imposed by the external modes is closely aligned with a Shafranov shift of half the minor radius. An important difference from conventional tokamak second stability operation is that a second stable window for the n = 1 modes is demonstrated here with a wall for the plasma.

Additional information

Authors: COOPER W A, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);TROYON F, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Paper presented: 20th EPS Conference on Controlled Fusion and Plasma Physics, Lisboa (PT), July 26-30, 1993
Availability: Available from (1) as Paper EN 37361 ORA
Record Number: 199311174 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: en
Available languages: en
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