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P: Fachverband Plasmaphysik
P 6: Plasma Wall Interaction I
P 6.3: Talk
Tuesday, March 17, 2026, 11:45–12:00, KH 01.020
Characterization of the strike lines in the Wendelstein 7-X stellarator — •Sebastian Dräger1,2, Thierry Kremeyer1, Yu Gao1, Felix Reimold1, and Robert Wolf1,2 — 1Max Planck Inst. for Plasma Physics, 17491 Greifswald, Germany — 2Technical University of Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany
Magnetic confinement fusion power plants need for sustaining operation an efficient plasma exhaust. After heating the plasma, removal of fusion products is necessary or a steady-state can't be maintained. Even for today's experiments, density control via particle removal is valuable. Inside a device like Wendelstein 7-X (W7-X), the ionized particles of the plasma are confined by the magnetic field. An exhaust can only be accomplished after their neutralization. Therefore, in a divertor system, diverted field lines carry plasma away from the confining toroid onto target plates. Such a diversion can be achieved through X-points, -lines, or -loops. At W7-X, X-loops are created through a resonance on rational rotational transform surfaces, resulting in magnetic islands. The field lines of these islands, especially their separatrix, are intersected by the divertor target plates. At the intersection the ionized particles neutralize. Strike lines, high-intensity regions, emerge on the target surface. Here the divertor needs to sustain the incoming plasma heat flux. Unexpected changes in the flux topology may lead to a reduction in the exhaust efficiency or a risk of the divertor's integrity. To better understand and predict the strike lines behavior a set of experiment programs were evaluated. A full characterization of the strike lines dimensions and magnitudes was accomplished.
Keywords: Strike lines; Divertor; Halpha photon flux; Heat flux