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Abstract

The phenomenon of major disruptions in tokamaks is well known. Despite detailed experimental studies, the theoretical understanding has remained poor. In this paper numerical simulations are presented, as well as a theoretical model for major disruptions triggered by exceeding the density limit. The model contains as its main elements non-linear mode coupling induced by the presence of a large amplitude m=2/n=1 mode and non-linear interaction involving primarily the 2/1, 1/1 and 3/2 modes. The model is consistent with the experimental observation that a major disruption takes place in two steps. The simulations on which the model is based use the reduced-MHD equations together with an equation for the electron temperature including ohmic heating, radiation losses and highly anisotropic thermal conduction. The radiation losses are prescribed so as to match measurements on JET during a density limit disruption, and a neoclassical formula is used for the resistivity. A more detailed account of these simulations is given.

Additional information

Authors: BONDESON A, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH);PARKER R D, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH);HUGON M, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Article: Proceedings of the 18th European Conference on Controlled Fusion and Plasma Physics, Vol. 15C (1991) Part II, pp. 41-44
Record Number: 199210099 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en
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