Greifswald 2024 – scientific programme

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P: Fachverband Plasmaphysik

P 12: Poster II

P 12.8: Poster

Tuesday, February 27, 2024, 16:30–18:30, ELP 6: Foyer

Tomographic localization of turbulent density fluctuations in the Wendelstein 7-X stellarator — •Christian Brandt, Thomas Wegner, Charlotte Büschel, Sara Vaz Mendes, Kian Rahbarnia, Henning Thomsen, and and the W7-X Team — Max-Planck-Institute for Plasma Physics, Greifswald, Germany

The soft X-ray tomography system in the Wendelstein 7-X stellarator is suited to spatially localize turbulence activity by elaborating X-ray radiation fluctuations, which are the results of turbulent density fluctuations. The amplitude of fluctuations investigated in poloidal-radial mappings of temporal evolving tomographic inversions suggests a connection to the flux surface geometry, especially to the flux surface compression. This effect is investigated for different plasma scenarios in terms of heating and density, which enable a variation of turbulent fluctuation levels as generally known from other measurements. The presented diagnostic approach as well as the link to the driving mechanism of turbulence are discussed.

Keywords: tomography; turbulence; flux surface compression; transport; fluctuations