Erlangen 2026 – scientific programme
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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.104: Poster
Thursday, March 19, 2026, 13:45–15:45, Redoutensaal
Localized probe measurements across magnetic islands: implications for divertor operation in W7-X — •Alice Bonciarelli1, Carsten Killer1, Olaf Grulke1, Alexander Knieps1,2, Yu Gao1, Sebastian Thiede1, Marcin Jakubowski1, Arun Pandey1, and W7-X Team1 — 1Max-Planck-Institut für Plasmaphysik, Wendelsteinstr. 1, 17491 Greifswald, Germany — 2Forschungszentrum Jülich GmbH, Institute of Fusion Energy and Nuclear Waste Management, Plasma Physics, 52425 Jülich, Germany
The optimized stellarator Wendelstein 7-X (W7-X) employs an island divertor. In this configuration, the scrape-off layer (SOL) is organized by a chain of resonant magnetic islands, which intersect the divertor targets placed accordingly. The latter act as a heat and particle exhaust system. The energy and particle transport processes are particularly challenging to disentangle in the complex three-dimensional magnetic geometry of the island divertor SOL. To investigate these complex edge regions, a suite of diagnostics is used, including a multi-user platform for reciprocating Langmuir probe measurements, that provides highly localized measurements of electron temperature and density as well as floating potential with high temporal resolution. The measurements indicate a complex distribution of plasma parameters in the island SOL, with well-localized features that presumably correlate to the island geometry and connection length distribution. By tracing magnetic field lines from the reciprocating probe sampling region to the divertor targets, local SOL measurements can be directly linked to divertor heat fluxes and plasma parameters.
Keywords: Fusion; Stellarator; Magnetic Islands; Scrape-off layer; Langmuir Probes