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(THP2/09) Resistive edge modes, a scenario for the L-H transition due to heat flux

J. Weiland and H. Nordman

Department of Electromagnetics, Chalmers University of Technology, EURATOM-NFR Association, S-412 96 Göteborg, Sweden

R. Singh
Institute for Plasma Research, Bhat, Gandhinagar 382424, India

Abstract.  A scenario for the L to H mode transition in tokamaks due to heat flux is presented. The mechanism is stabilization of a strongly ballooning resistive edge mode by the ion diamagnetic drift. We find that this stabilization may occure before that of poloidal rotation as a function of increasing ion temperature gradient at the edge. We have also found a new type of toroidal condensation instability which is found to dominate transport in the H-mode edge of tokamak plasmas when the temperature gradient is steeper than the density gradient. A particle pinch develops at the edge in agreement with experimental observations and the transport can be dominated by the ion or electron channel.

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IAEA 2001