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  • Stabilization of axisymmetric modes and the effects of plasma deformability in elongated tokamak plasmas using active feedback coils inside and outside the vacuum vessel

Abstract

The feedback stabilisation of the vertical instability in a highly elongated (k = 3) TCV plasma is studied using a combination of active coils inside and outside the vacuum vessel. The axisymmetric stability is calculated using the NOVA-W code. It is found that the deformation of the eigenfunction plays a crucial role in the feedback system. The deformation resulting from a particular choice of active coils decides the choice of magnetic measurements needed to determine the vertical displacement. A large number of magnetic measurements distributed around the plasma can be much less effective than a small number of well placed measurements.

Additional information

Authors: 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)
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 36863 ORA
Record Number: 199210699 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en