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P: Fachverband Plasmaphysik
P 10: Poster Session I
P 10.50: Poster
Tuesday, April 1, 2025, 16:15–18:15, ZHG Foyer 1. OG
MHD equilibrium reconstructions for Wendelstein 7-X stellarator including soft x-ray emission data — •Edith Hausten1, Kian Rahbarnia1, Henning Thomsen1, Christian Brandt1, Charlotte Büschel1, Sara Vaz Mendes1, and Samuel Lazerson2 — 1Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany — 2Gauss Fusion GmbH, Parkring 29, 85748 Garching bei München, Germany
In fusion experiments such as the Wendelstein 7-X Stellarator, knowledge about the plasmas MHD equilibrium is of crucial importance for the interpretation of measurements and to obtain several quantities that are not measured directly. The equilibrium can be reconstructed from experimental data by using the STELLOPT code [S. Lazerson 2015 Nucl. Fusion 55]. It uses an optimization algorithm to find the equilibrium that best matches measured target values of various diagnostics. Currently, the code is being enhanced to incorporate measurements of the XMCTS camera system, a diagnostic measuring the plasmas soft x-ray emissivity within a poloidal plane. The aim is to improve the quality of reconstructions, especially with respect to the Shafranov shift, which can be inferred from soft x-ray observations as previously demonstrated. The Shafranov shift is the outward shift of the magnetic axis compared to the vacuum field, and is increasing in strength with rising plasma beta. First results of reconstructions employing the new STELLOPT feature are presented with a focus on high energy discharges and the obtained Shafranov shift size is compared to analytical estimations as well as pure experimental measurements.
Keywords: stellarator; Wendelstein 7-X; equilibrium; x-ray; Shafranov shift