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Abstract

Ideal MHD instabilities grow on the fast time scale given by the Alfven wave transit time across the major radius, usually in the microsecond range. These instabilities are driven by the current and the pressure. In Tokamaks they lead to a current limitation and a pressure limit. The main results of the standard large aspect circular cross-section Tokamak theory are presented (internal and external kinks). The effect of toricity is then demonstrated with some numerical results. The most important new element is the appearance of ballooning of modes across magnetic surface and pressure destabilization of the long wavelength external kinks. A semi-empircal scaling law which gives the maximum pressure which can be confined in a Tokamak is presented with the supporting experimental status.

Additional information

Authors: TROYON F CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND), CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND)
Bibliographic Reference: COURSE AND WORKSHOP "BASIC PHYSICAL PROCESSES OF TOROIDAL FUSION PLASMAS", VARENNA (ITALY), AUG. 26-SEPT. 3, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32272 ORA
Availability: Can be ordered online
Record Number: 1989124011100 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en