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P: Fachverband Plasmaphysik

P 19: Poster II

P 19.6: Poster

Donnerstag, 31. März 2022, 16:00–17:30, P

Analytical investigation of heat conduction of plasmas in a magnetic field with an island — •Gregor Pechstein and Per Helander — Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald

In a hot plasma that is magnetically confined in a fusion device, heat is transported across flux--surfaces towards the plasma vessel. In the W7-X stellarator, the plasma edge consists of a magnetic island chain. The magnetic islands function as Scrape--Off Layer (SOL), directing the plasma to a divertor. Radiative cooling through collisions with impurities such as carbon can play an important role in reducing the heat loads on the plasma-facing components.

We investigate a heat conduction equation with a loss term describing radiation in and around a magnetic island. The full 2D heat conduction problem can be reduced to a 1D description in the limit of large parallel heat conduction. We focus our investigation on understanding heat transport in three regions: the island center (the ``O-point''), the seperatrix, and the region far away from the island. Far away from the magnetic island, the heat conduction given by our model reduces to the perpendicular heat conduction across flux surfaces without an island. The effective heat conduction coefficient reaches a maximum at the seperatrix. The influence of this heat conduction coefficient on the position of the radiation front is also discussed.