SMuK 2021 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 17: Poster II
P 17.21: Poster
Freitag, 3. September 2021, 14:00–16:00, P
Updates on The He/Ne beam diagnostic for line ratio spectroscopy in the Island Divertor of Wendelstein 7-X — Erik Flom1, Tullio Barbui1,2, Oliver Schmitz1, Marcin Jakubowski3, Frederik Henke3, Carsten Killer3, Maciej Krychowiak3, Ralf Koenig3, Stuart Loch4, Jorge Munoz-Burgos5, John Schmitt4, and •The W7-X Team3 — 1University of Wisconsin-Madison, Madison, WI — 2Princeton Plasma Physics Laboratory, Princeton, NJ — 3Max Planck Institute for Plasma Physics, Greifswald, Germany — 4Auburn University, Auburn, AL — 5Astro Fusion Spectre, San Diego, CA
A line-ratio spectroscopy system based on thermal helium and neon collisional radiative models (CRM) has been implemented and successfully shown to enable measurement of ne and Te above the horizontal divertor targets in two in the standard divertor configuration magnetically connected modules of the Wendelstein 7-X optimized stellarator. In this work, modeling results are presented for standard attached and detached conditions in the divertor of Wendelstein 7-X to show the helium and neon emissivity as a function of radial position above the divertor target. This work also includes first in-situ measurements of gas cloud atomic density distribution from an gas injector identical to the one utilized at W7-X. Also shown are comparisons between helium beam data and multipurpose manipulator probe data using a novel flux coordinate system, an improvement over previous field-tracing methods for diagnostic comparison within the 5/5 island chain.