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It has been found that ideal ballooning modes can impose very restrictive volume average beta limits in torsatrons much below the typical values close to 5% that are required to be economically realisable as reactor systems and it has been shown that externally applied toroidal currents that are peaked can destabilise the Mercier criterion in this type of configuration. We will show here that if the applied currents are hollow, they can stabilise the ballooning modes without triggering Mercier instabilities and as a result raise the limiting beta(*) from 2% to 5%.

Additional information

Authors: COOPER W 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. 241-246
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