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Abstract

Calculations show that the rotation of a tokamak plasma, coupled with a resistive wall, can stabilise the pressure-driven external kink mode and significantly raise the beta limit imposed by these modes. These results are obtained with two MHD stability codes (NOVA-X, a modification of the NOVA-W code, and MARS) which include a resistive wall in the vacuum calculation. The effect of rotation velocity and wall position on the stabilisation of external kinks for various equilibria is given. Two types of modes occur: those which are nearly locked to the wall and those which rotate with the plasma. For the wall-locked modes the stabilising effect of rotation increases with increasing wall distance. This leads to a window of stability between the threshold wall distance for a given rotation speed and the marginal wall position for the ideal mode. The coupling of the sound waves is found to increase considerably the magnitude of the stabilisation.

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)
Bibliographic Reference: Article: Bulletin of the American Physical Society, Vol. 38 (1993) No. 10, p. 2013
Record Number: 199311630 / Last updated on: 1994-11-28
Category: PUBLICATION
Original language: en
Available languages: en