Community Research and Development Information Service - CORDIS

Abstract

Despite the quality of confinement in tokamaks, some plasma flow is perpendicular to the magnetic field lines. This diffusion gives rise to a layer of disturbed plasma, the scrape-off layer, where the plasma comes up against obstacles to its predominant flow parallel to the magnetic field. For optimal design of limiters to remove the energy, it is essential to know how deep this layer is. The research objective was to determine a code to solve the heat transfer equation in the limiters, taking into account their real geometry and the exact magnetic configuration. To plot the temperature on the limiter surface during plasma shocks, an optical system linked to an infrared camera can be used. The code provides a means of interpreting these temperatures by accurately simulating measurements (of density excursions, current, toroidal field, additional power intake) so as to determine the depth, and the variations of this depth with the various plasma parameters. The experimental results are consistent with a simple theoretical model of the edge plasma.

Additional information

Authors: SEIGNEUR A, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);SCHLOSSER J, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: Troisième Congrès de la Société Française de Physique - Plasma, Nancy (FR), September 16-18, 1992
Availability: Available from (1) as Paper FR 37069 ORA
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