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P: Fachverband Plasmaphysik

P 17: Poster Session II

P 17.42: Poster

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

Divertor island studies with GRILLIX — •Barnabas Csillag, Andreas Stegmeir, Christoph Pitzal, Marion Finkbeiner, and Frank Jenko — Max Planck Institute for Plasma Physics, Garching, Germany

The global, electromagnetic, drift-reduced, trans-collisional Braginskii fluid turbulence code GRILLIX has been recently adapted to stellarator geometry. However, in order to perform comprehensive simulations of the Wendelstein 7-X Scrape-Off Layer (SOL) plasma, it is necessary to reconsider the treatment of boundary conditions in the model. So far the Immersed Boundary Approach (IBA) has been applied in GRILLIX, and using that the code was able to produce high fidelity tokamak edge-SOL simulations in diverted geometry. Nevertheless, the 3D geometry of the W7-X island divertors could present an insurmountable obstacle with such approach.

To examine the effects of boundary condition treatments in GRILLIX, a simplified divertor island geometry is investigated. In this test environment a circular toroidal magnetic field is applied with helical perturbations superimposed on it, creating the magnetic islands at a rational surface. In this model the magnetic islands can be intersected with poloidal target plates that are following the helical shape of the islands, similarly to the divertor plates of Wendelstein 7-X. Such setup is suitable to test the boundary condition treating methods, like the already implemented IBA, or if it is not found sufficient, for instance the Leg Value Fill scheme.

Keywords: stellarator; scrape-off layer; island divertor; fluid turbulence