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Abstract

Computations have been made with a three-dimensional reduced MHD model to investigate the triggering of disruptions in tokamaks. We have focussed attention on destabilization through nonlinear interaction between modes of different helicity. We confirm the rapid growth of m/n = 2/1, 3/2 and other modes for strongly unstable initial conditions, but find saturated final states which are not significantly different from the results of single helicity calculations. Such unstable starting points are anyway not inescapable: we show that much more stable profiles are well within experimental error bars. These factors lead us to conclude that dynamical mode interaction is by itself an insufficient trigger.

Additional information

Authors: EASTWOOD J W, CULHAM LABORATORY, ABINGDON (UK);ARTER W CULHAM LABORATORY, ABINGDON (UK), CULHAM LABORATORY, ABINGDON (UK)
Bibliographic Reference: WRITE TO THE LIBRARIAN, UKAEA, CULHAM LABORATORY, ABINGDON, OXON OX14 3DB (UK), MENTIONING REPORT CLM-P 735, 1985
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