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P: Fachverband Plasmaphysik
P 16: Poster Session Plasma Physics
P 16.18: Poster
Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal
Profile Analysis of the Midplane Helium Beam for Scrape-off Layer Characterization at Wendelstein 7-X — •Foisal B.T. Siddiki1,2, Oliver Schmitz1, Maciej Krychowiak2, Frederik Henke2, Dorothea Gradic2, and Miklos Vecsei2 — 1University of Wisconsin-Madison, Madison, USA — 2Max Planck Institute for Plasma Physics, Greifswald, Germany
Optimizing the heat and particle exhaust system of Wendelstein 7-X (W7-X) requires a quantitative understanding of scrape-off layer (SOL) transport, informed by measurements of the electron temperature (Te) and density (ne). To investigate SOL transport, a new helium-beam system was installed at the midplane of W7-X and operated during the OP2.2 and OP2.3 experimental campaigns. The midplane helium-beam diagnostics consist of a controlled gas injection system and a high-resolution spectrometer, from which Te and ne are inferred using helium line ratios based on a collisional radiative model of atomic helium. In this work, we present the first results from the midplane helium beam and benchmark them against co-located alkali-beam measurements. Initial analysis of the midplane profiles reveals two distinct SOL transport regimes. SOL characteristic decay lengths and heat-flux width scaling derived from these profiles will also be presented.
Keywords: Wendelstein 7-X (W7-X); Scrape-Off Layer; Island Divertor; Nuclear Fusion; Helium Line Ratio Spectroscopy