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Tearing modes have recently attracted attention following theoretical successes in predicting the presence of magnetic islands with moderate poloidal m = 3,4 and toroidal n = 2,3 mode numbers during tokamak fusion test reactor supershots. In all theories, the crucial parameter which determines the stability from both the geometry and equilibrium profiles is Delta'. It is shown in the present study that the Delta' of the (m = 2, n =1) mode computed with PEST-3 code is virtually always positive. Saturation can nevertheless be achieved provided the symmetry breaking term of a current gradient is included in the resistive layer.

Additional information

Authors: PLETZER A, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH)
Bibliographic Reference: Article: Proceedings of the Joint Varenna-Lausanne International Workshop on 'Theory of Fusion Plasmas', Varenna (IT), August 26-30, 1996, pp. 259-266
Record Number: 199710330 / Last updated on: 1997-04-14
Original language: en
Available languages: en