A mechanism for the reconnectingm= 2N=1 instability inq>1 shearless equilibrium
- 1 June 1996
- journal article
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
- Vol. 38 (6) , 803-810
- https://doi.org/10.1088/0741-3335/38/6/003
Abstract
A model for the ballooning mode destabilization in the presence of a sufficiently large island is developed. This model may explain the fast MHD activity (sawtooth-like) observed on Tore Supra during LH current drive in shearless equilibrium regimes with a safety factor on axis of just less than two. A simple analytical stability criterion is derived which indicates whenever an equilibrium is stable or unstable against the ballooning mode. The model is supported by Tore Supra experimental data and may also apply in other tokamaks exhibiting nearly flat q-profiles.Keywords
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