Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.13: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
Island divertor studies in 3D using GRILLIX — •Barnabas Csillag1, Andreas Stegmeir1, Christoph Pitzal1, Konrad Eder1, Miguel Madeira2, Marion Finkbeiner1, and Frank Jenko1 — 1MPI for Plasma Physics, Garching, Germany — 2MPI for Plasma Physics, Greifswald, Germany
Understanding and predicting heat exhaust properties is one of the main challenges on the path towards a stellarator power plant. The island divertor is a key feature in the Scrape-Off Layer of most current stellarator reactor designs, and it is also experimentally investigated in the Wendelstein 7-X (W7-X) stellarator. Numerical modeling of island divertors usually relies on transport codes. However, discrepancies between these predictions and experimental data highlight the need for more sophisticated approaches.
In this work, we employ the transcollisional fluid turbulence code GRILLIX to simulate a simplified island divertor geometry. The configuration involves a helically perturbed circular toroidal magnetic field, generating a magnetic island chain at a rational surface. These islands are intersected by discrete target plates aligned with the island chain, mimicking the divertor topology of W7-X. Such model enables the investigation of general island divertor phenomena, including the structure of the electrostatic potential, and the influence of sheared poloidal flows. By analyzing these features, we advance our understanding of island divertor physics in tractable geometries - an essential step before tackling more complex geometries, like W7-X.
Keywords: stellarator; island divertor; Scrape-Off Layer; fluid turbulence; modelling