Greifswald 2024 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 25: Poster III

P 25.24: Poster

Donnerstag, 29. Februar 2024, 16:30–18:30, ELP 6: Foyer

heat conduction in the vicinity of an island — •Gregor Pechstein and Per Helander — Max-Planck-Institut für Plasmaphysik, Wendelsteinstraße 1, 17491 Greifswald

In magnetically confined fusion plasmas, energy is transported across flux-surfaces toward the plasma edge and the surrounding vessel. It is a challenge to control and limit the wall loads since the tolerable energy flux onto plasma facing component is limited by a number of technical constraints. In order to control and reduce the loads, tokamaks and stellarators exploit divertor magnetic fields guide the heat flux onto target plates, and try to maximise radiation from the edge plasma. When the radiative losses are particularly high, the plasma sometimes ``detaches'' from the walls and the energy flux to the latter drops dramatically.

The key feature of plasma energy transport that allows for the use of a divertor is the fact that the transport is highly anisotropic. As a result, if the magnetic field is shaped in such a way that different field lines have different topology, the the heat flux can vary greatly across any surface across which the topology changes. We consider anisotropic heat conduction and radiation in the simplest possible mathematical setting in which the field lines change topology, namely, in the geometry of a single chain of magnetic islands. The aim is to shed light on the basic question of how a variation in field-line topology affects the location and amount of plasma radiation.