Erlangen 2026 – scientific programme
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.9: Poster
Thursday, March 19, 2026, 13:45–15:45, Redoutensaal
Fluid Turbulence Simulations in Geometries with Internal Magnetic Islands — •Miguel Madeira1, Andreas Stegmeir2, Christoph Pitzal2, Barnabas Csillag2, Felix Reimold1, and Peter Manz3 — 1Max-Planck-Institut für Plasmaphysik, Greifswald, Germany — 2Max-Planck-Institut für Plasmaphysik, Garching, Germany — 3University of Greifswald, Institute of Physics, Greifswald, Germany
Understanding edge turbulence is crucial for improving plasma confinement. Magnetic islands are especially relevant for the island divertor concept and their potential involvement in the formation of internal transport barriers. The plasma fluid turbulence code GrilliX now supports 3D geometries, including circular toroidal equilibria with magnetic islands and MGRID equilibria. The latter enables simulating the neoclassically optimized stellarator W7-X, with validation currently underway.
W7-X can operate in various magnetic configurations. In several limiter configurations, where the 5/5 islands lie inside the last closed flux surface, the plasma energy increases, peaking in the so-called FMM configuration. This study aims to validate Grillix's new capabilities and to investigate turbulence around W7-X's 5/5 magnetic island chain in limiter configurations. A critical island width for ExB flow around the islands is shown in a circular toroidal geometry consistent with previous studies. In the first W7-X simulations, the perpendicular plasma flow shape previously measured for the FMM configuration is reproduced, showing the characteristic "W" shape.
Keywords: Magnetic Islands; Radial Electric Field; Fluid Turbulence; Transport Barrier; Stellarator