Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 17: Poster Session II

P 17.11: Poster

Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Fluid Turbulence Modelling of Magnetic Islands in Stellarators — •Miguel Madeira, Sophia A. Henneberg, and Brendan Shanahan — Max-Planck-Institut für Plasmaphysik, Wendelsteinstr. 1, 17489 Greifswald, Germany

Understanding scrape-off layer (SOL) turbulence is crucial for advancing nuclear fusion technology, particularly in improving plasma confinement and performance. While extensive efforts have been dedicated to developing plasma fluid turbulence codes, most applications have focused on tokamak configurations. With the recent success of Wendelstein 7-X (W7-X) and the rising interest in stellarators, multiple codes have now been adapted for three-dimensional simulations and are ready to be leveraged for future physics studies.

This research aims to enhance the understanding of SOL turbulence around magnetic islands in stellarators, specifically focusing on W7-X, by utilizing two fluid turbulence codes, BSTING and GRILLIX. The flexible coil system of W7-X enables control over its magnetic islands' locations and sizes. Notably, when the 5/5 island chain is inside the last closed flux surface, a transition to improved electron transport has been observed. This state is characterized by higher plasma energy and periodic sawtooth crashes within the island region, known as island localized modes (ILMs). The frequency and amplitude of these crashes correlate with the island size.

Given the critical role of magnetic islands in improved confinement scenarios and the island divertor design for future stellarator reactors, this work explores how they influence turbulence behavior.

Keywords: Magnetic Islands; SOL; Plasma Turbulence; Plasma Simulation; Fusion Plasma