Hannover 2020 – scientific programme

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P: Fachverband Plasmaphysik

P 5: Poster Session 1

P 5.13: Poster

Monday, March 9, 2020, 16:30–18:30, Empore Lichthof

Soft X-ray survey of high-performance experiments in Wendelstein 7-X — •Jonathan Schilling, Henning Thomsen, Christian Brandt, Sehyun Kwak, Jakob Svensson, and the W7-X - Team — Max-Planck-Institut für Plasmaphysik

Soft X-ray radiation emitted from a high-temperature plasma can be used to infer local information about the plasma temperature and density. The soft X-ray tomography diagnostic XMCTS in the superconducting stellarator Wendelstein 7-X has been used in the latest operational phases OP1.2a and OP1.2b to measure the soft X-ray radiation from the plasma in one plane of constant toroidal angle. Recent upgrades of the diagnostic model made it possible to compute tomographic inversions of the soft X-ray emissivity throughout the whole available dataset from OP1.2a and OP1.2b, even though significant influence of diagnostic effects have to be modelled along with the tomography. On this poster, a survey of the soft X-ray data focused on the high-performance experiments conducted in Wendelstein 7-X is presented. One aspect of this dataset is the direct measurement of the Shafranov shift due to high plasma pressure and quantitative comparison against theoretical predictions from equilibrium reconstructions.