Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 17: Poster Session II
P 17.37: Poster
Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Quantification and analysis on the formation of a secondary strike line in the Wendelstein 7-X stellarator — •Sebastian Dräger1, Thierry Kremeyer1, Yu Gao1, Robert Wolf1,2, and Felix Reimold1 — 1Max Planck Inst. for Plasma Physics, 17491 Greifswald, Germany — 2Technical University of Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany
In future magnetic confinement fusion reactors, efficient particle exhaust is essential for sustained operation. Helium ash, generated during fusion reactions, and other impurities must be removed to enable steady-state fusion and maintain plasma stability. Since ionized particles are confined by magnetic fields, their removal requires neutralization. For this purpose, Wendelstein 7-X (W7-X) employs an island divertor system. Magnetic islands intersect with target plates, where particles neutralize upon contact, allowing their exhaust. These interactions form high-intensity regions known as strike lines. The divertor plates are meticulously engineered to endure the plasma’s heat flux. However, unexpected shifts in heat flux topology pose a significant risk to their integrity.
Recent observations at W7-X have revealed under certain operational conditions the formation of a secondary strike line [1].
This phenomenon, identified through infrared imaging and Hα photon emission, represents a notable change in the heat flux pattern.
A precise quantification of the secondary strike line and an analysis of its dependence on plasma parameters is presented.
[1] Yu Gao et al 2024 Nucl. Fusion 64 076060
Keywords: Divertor Physics; Wendelstein 7-X