Hannover 2020 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 10: Poster Session 2

P 10.5: Poster

Dienstag, 10. März 2020, 16:30–18:30, Empore Lichthof

Tomographic inversion analysis of current-driven MHD col- lapses in Wendelstein 7-X stellarator plasmas — •Henning Thomsen, Christian Brandt, Yu Gao, Sara Mendes, Kian Rahbarnia, Jonathan Schilling, Torsten Stange, and Marco Zanini — MPI f. Plasmaphysik, Wendelsteinstr 1, 17491 Greifswald

The X-ray tomography system XMCTS has been operated in the recent campaign of Wendelstein 7-X stellarator. The diagnostic consists of 20 cameras inside the plasma vessel and enables tomographic image reconstruction from more than 300 lines of sight. Problems in the camera shutter setup were identified and are considered in the tomographic inversion procedures. Tomogram series of intervals with high time resolution are used to visualize fast internal MHD plasma events in order to understand the underlying instability mechanisms. One important data analysis tool for post-processing is the filtering of the spatio-temporal data with the singular value decomposition. This technique can be used to remove the background radiation distribution of the tomograms. We apply these methods to X-ray data recorded during experiment programs with toroidal electron cyclotron current drive, in which fast collapses of the central plasma temperature profile have been observed.