Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 17: Poster Session II

P 17.33: Poster

Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Investigation of perpendicular transport effects in W7-X divertor islands using 2D plasma parameter measurements with MANTIS. — •Joey Louwe, Felix Reimold, Valeria Perseo, Victoria Winters, Henry Greve, Thomas Klinger, Michael Griener, and W7-X team — Max Planck Institute for Plasma Physics, 17491 Greifswald/85748 Garching, Germany

To enhance the performance of fusion experiments, such as Wendelstein 7-X (W7-X), the divertor concept is employed to efficiently exhaust plasma particles, impurities and heat from the plasma. Both stellarators and tokamaks employ divertors, though their designs differ. W7-X implements the Island Divertor, which utilizes magnetic islands to divert and guide particles and heat along magnetic field lines to target plates. Compared to typical tokamak divertors, the stellarator divertor field lines have a significantly lower pitch angle, making perpendicular transport effects more significant. This study aims to characterize these perpendicular transport effects utilizing the Multispectral Advanced Narrowband Tokamak Imaging System (MANTIS) being build for the W7-X reactor. By integrating MANTIS with active gas puff imaging and helium impurity injections, we can measure specific spectral lines to create 2D images of electron density and temperature of the divertor islands. Additionally, the EMC3-EIRENE simulation code is employed in the determination of optimal helium injection positions, identifying six strategic locations for effective coverage of the divertor island region.

Keywords: Wendelstein 7-X (W7-X); MANTIS; Active gas puff imaging; Island Divertor