Sawteeth stabilization by energetic ions in tokamaks
The aim of this paper is to present the basic mechanisms involved in sawtooth stabilisation and the related experimental programme of the Tore Supra device. After a brief introduction to fusion in tokamaks and to the experimental evidence of sawtooth behaviour, the tearing mode destabilisation process and its control by suprathermal ions is examined. A recent kinetic analysis has led to a better understanding of this problem, allowing the identification of a class of particles which are especially efficient, and the calculation of stability thresholds. The analytical and numerical results are in qualitative agreement with the experiment, and this model will be used in the near future to optimise the heating scenarios in tokamaks.
Bibliographic Reference: Paper presented: Physiques en Herbe 92, Marseille (FR), July 5-10, 1992
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Record Number: 199310107 / Last updated on: 1994-11-29
Original language: en
Available languages: en