Erlangen 2026 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.17: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
Asymmetric scrape-off layer plasma parameter changes and their implications for diagnostic comparability in W7-X — •F Scharmer1, A von Stechow1, C Killer1, SG Baek2, S Ballinger2, Y Gao1, O Grulke1,3, S Hörmann1, M Jakubowski1, E Maragkoudakis1, S Thiede1, A Tsikouras1, M Vecsei1, and the W7-X Team1 — 1MPI for Plasma Physics, Greifswald (Garching), Germany — 2MIT PSFC, Cambridge, USA — 3Department of Physics, TU Denmark, Lyngby, Denmark
The Wendelstein 7-X stellarator experiment uses the island divertor concept for power and particle exhaust. To characterize the scrape-off layer (SOL), different diagnostics view different magnetic islands. The five-fold toroidal symmetry is typically used to combine measurements of separate quantities from different islands. The gas puff imaging (GPI) diagnostic observes complex drift flow patterns in the islands. These flow patterns and SOL profiles are strongly dependent on the magnetic geometry of the island and discharge parameters, such as power and density. GPI measurements show sudden shifts in light emission and fluctuation parameters, indicating changes in plasma conditions. These transitions are not reflected in global core plasma parameters. In addition, divertor heat flux measurements and further SOL diagnostics viewing different islands show that these sudden transitions are often isolated to just one of the five islands. In this contribution, we investigate the prevalence and asymmetry of these SOL plasma parameter changes, as well as their implications for the comparability of physical quantities in different islands.
Keywords: Island divertor; Wendelstein 7-X; Gas puff imaging