SMuK 2023 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 11: Poster I

P 11.21: Poster

Mittwoch, 22. März 2023, 14:00–15:30, HSZ EG

Overview of MHD mode observations during the recent operational phase at the Wendelstein 7-X stellarator — •Kian Rahbarnia, Sara Vaz Mendes, Charlotte Bueschel, Christian Brandt, Henning Thomsen, Adrian von Stechow, Jan-Peter Baehner, Ralf Kleiber, Christoph Slaby, Axel Koenies, and Wendelstein 7-X Team — Max-Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany

In November 2022 the second operational phase (OP2) at Wendelstein 7-X (W7-X) started. Amongst many technical and diagnostic upgrades W7-X has been equipped with a fully water cooled high heat flux divertor, which in principle allows to operate high energy regimes for several minutes up to the envisaged half hour pulse. During the first part of the recent phase, OP2.1, a number of experiments have been conducted, specifically to investigate the role of magnetohydrodynamic (MHD) mode activity in high power heating scenarios involving neutral beam injection and electron cyclotron resonance heating. The obervation of various fluctuation diagnostics (Mirnov coils, soft X-ray tomography, phase contrast imaging, electron cyclotron emmission) are investigated and closely compared to findings of past operational campaigns. This contribution will mainly focus on Alfvén eigenmode activity, new insight concerning their driving mechanism and impact on high performance experiments.