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P: Fachverband Plasmaphysik
P 10: Poster Session I
P 10.42: Poster
Dienstag, 1. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Analysis of the electrostatic potential distribution and drifts in island divertor geometries using fluid turbulence simulations — •Tobias Tork1, Felix Reimold1, David Bold1, Brendan Shanahan1, Sergei Makarov1, Peter Manz2, and the W7-X Team1 — 1Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany — 2Institute of Physics, University of Greifswald, 17489 Greifswald, Germany
In fusion devices, particle and heat exhaust pose a significant challenge. The island divertor concept was developed to address the exhaust problem. In this concept, the magnetic field is perturbed and forms magnetic islands at rational flux surfaces. These islands are intersected by target plates and divert particle and heat fluxes to the targets. In the island divertor of the stellarator Wendelstein 7-X, large poloidal ExB-velocities have been observed. These velocities are expected to significantly contribute to the transport of particle and energy. Current state of the art stellarator simulations are not incorporating drift effects. There is thus little knowledge about the electrostatic potential distribution and hence the ExB-drifts in an island divertor. To address this issue, the 3D-turbulence model Hermes-2 is used. It is applied to simplified geometries that mimic the island divertor topology. As Hermes-2 is a hot-ion drift reduced fluid model, it contains the electrostatic potential and thus the drift effects. The latter will be analyzed on mean field solutions to understand the electrostatic potential distribution and the impact of drifts and currents on the plasma parameters and the transport in the island.
Keywords: stellarator; island divertor; drifts