Göttingen 2025 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 22: Plasma Wall Interaction/HEPP
P 22.3: Vortrag
Donnerstag, 3. April 2025, 17:10–17:35, ZHG102
Engineering tool for the mitigation of target loads at leading edges in multi-configuration island divertors — •Antara Menzel-Barbara1,2, Joris Fellinger2, Rudolf Neu1,3, Dirk Naujoks2, and Michael Endler2 — 1TUM, Munich, Germany — 2IPP, Greifswald, Germany — 3IPP, Garching, Germany
The Wendelstein 7-X divertor is designed to intersect magnetic field lines at shallow angles. Because of inevitable steps between divertor components, small exposed areas called *leading edges* can be intersected almost perpendicularly by magnetic field lines and thus receive highly increased heat fluxes. Traditionally, mitigating leading edges involves tilting the divertor target or chamfering the problematic edges. However, as W7-X is capable of operating various magnetic configurations, this can lead to particle fluxes impinging from opposing directions on the same target surface, exposing new leading edges when mitigating one. The tool presented here allows to demonstrate that while such overlapping particle deposition patterns are manageable, achieving good separation is essential for relaxed tolerances and reduced manufacturing complexity. Furthermore, methods for achieving this separation are explored via field-line tracing creating divertor geometries from scratch for single configurations. By maintaining incidence angles below critical thresholds, overloads can be avoided. By identifying shadowed regions, divertor targets can be designed for compatibility with multiple configurations, while eliminating overlapping leading edges. It is envisioned to use this tool to explore divertor solutions optimized for particle exhaust, cost and ease of installation.
Keywords: Divertor; Leading edges; Optimization; Heat load; W7-X