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P: Fachverband Plasmaphysik
P 17: Poster Session II
P 17.9: Poster
Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG
Assessment of Radiation Asymmetries employing the new Imaging Bolometer diagnostic at W7-X — •Kevin Andrea Siever1, Gabriele Partesotti1, Felix Reimold1, Glen Wurden2, Fabio Federici3, Byron Jay Peterson4, and Kiyofumi Mukai4 — 1Max-Planck Institute for Plasma Physics, Greifswald, Germany — 2Los Alamos National Lab, New Mexico, United States — 3Oak Ridge National Lab, Tennessee, United States — 4National Institute for Fusion Science, Toki, Japan
Estimation of the plasma radiation distribution is a key aspect in the context of power exhaust optimization. This is particularly demanding in Stellarators due to the intrinsically 3D plasma geometry. The InfraRed Video Bolometer (IRVB) diagnostic provides wide spatial coverage both in the poloidal and toroidal directions, enabling direct observation of the emission gradients in the divertor region. Here we combine its data with that from the resistive bolometry systems to quantify the emissivity asymmetries at Wendelstein 7-X. First of all, the thermal properties of the bolometer foil need to be calibrated to allow correct inference of the impinging power. Using synthetic simulations of the calibration process allows to identify the optimal procedure and settings.
Given the IRVB measurements, we then employ the 2D radiation patterns obtained from the resistive bolometers to generate reference patterns with constant emissivity along the field lines. Comparing with the latter allowed us to isolate better the features of interest and to assess the toroidal gradients in the plasma emissivity
Keywords: stellarators; fusion; radiation