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P: Fachverband Plasmaphysik

P 17: Poster II

P 17.15: Poster

Friday, September 3, 2021, 14:00–16:00, P

Challenges in the tomographic reconstruction of radiation distributions of high temperature plasmas in Wendelstein 7-X stellarator — •Henning Thomsen, Christian Brandt, Sara Vaz Mendes, Kian Rahbarnbia, and Jonathan Schilling — MPI f. Plasmaphysics, Wendelsteinstr 1, 17491 Greifswald

The spatial-temporal dynamics of plasma radiation in the soft-X ray range is studied by means of the tomography diagnostic system (XMCTS) in Wendelstein 7-X stellarator. The radiation in this energy range originates mainly from Bremsstrahlung of the confined plasma. The quality tomographic inversion, the reconstruction of the radiation distribution in the plane spanned by the pinhole cameras from the line-integrated measurements, is strongly dependent on an accurate modelling of the diagnostic geometry. In this contribution we study the effect of the 3D shaped plasma in the observation volume. This effect is potentially more relevant in stellarators than in other magnetic confinement devices with simpler flux surfaces (like tokamaks).