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P: Fachverband Plasmaphysik
P 17: Poster II
P 17.39: Poster
Freitag, 3. September 2021, 14:00–16:00, P
Experimental Survey of Plasma-Terminating Events in the Wendelstein 7-X Stellarator — •Jonathan Schilling, Henning Thomsen, Christian Brandt, Kian Rahbarnia, Ekkehard Pasch, Marc Beurskens, Sergey Bozhenkov, Hannes Damm, Golo Furchert, Evan Scott, Matthias Hirsch, Neha Chaudhary, Karsten Ewert, Udo Höfl, Johan Willem Oosterbeek, Torsten Stange, Gavin Weir, Jens Knauer, Tsuyoshi Akiyama, Kai Jacob Brunner, Tamara Andreeva, Ulrich Neuner, Oliver Ford, Sehyun Kwak, Andera Pavone, Jakob Svensson, Marco Zanini, and the W7-W Team 1 — Max-Planck-Institute for Plasma Physics, Greifswald, Germany
An experimental data survey is conducted with a focus on global fast plasma-terminating events in the Wendelstein 7-X stellarator. These events associated with significant current drive may pose a risk for machine safety and need to be understood for reliable plasma operation in a future fusion power plant. Several such events were observed in recent campaigns of Wendelstein 7-X. Tomographic reconstruction of the soft X-ray emission pattern from the plasma allows to assess the spatio-temporal dynamics of these events with the necessary high resolution (fs = 2 MHz; Δ R = Δ Z = 4 cm). Those results are subsequently compared to experimental data from the Thomson scattering diagnostic (ne, Te profiles), the electron cyclotron emission diagnostic (Te profile) and the single-channel interferometer (∫ne dl).