Düsseldorf 2007 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 14: Magnetischer Einschluss

P 14.2: Vortrag

Mittwoch, 21. März 2007, 14:50–15:05, 6B

A model for transport of heat through magnetic islands — •Abhinav Gupta, Xavier Loozen, Mikhail Tokar, and Robert Wolf — Institut fuer Energieforschung, Forschungszentrum Juelich GmbH, EURATOM Association, Trilateral Euregio Cluster, 52425 Juelich, Germany

On application of small resonant magnetic field perturbations non-overlapped magnetic island chains can be formed, where transport is enhanced due to radial component of transport along field lines. Such a modification of the heat transport is relevant for ELMs suppression and, moreover, can be helpful to get information about transport along field lines being of importance in stochastic plasmas and during ELMs. In the present work a model for transport of heat through magnetic islands has been developed. Contrary to previous approaches, by considering the continuity of heat flux we avoid assumptions on the temperature profile in the island based on the profile shape without island. Transport along different paths with sections parallel and perpendicular to the field lines is considered. The effective heat conduction through the island is determined as that along optimal paths with the smallest temperature difference. The model predicts that heat is mainly transported near the island separatrix and provides the variation of the effective heat conductivity with field perturbation level.