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P: Fachverband Plasmaphysik

P 16: Poster Session Plasma Physics

P 16.103: Poster

Donnerstag, 19. März 2026, 13:45–15:45, Redoutensaal

Electric Field Reconstruction via Impurity-Induced Rotation in Wendelstein 7-X — •Thomas Wegner, Henning Thomsen, Christian Brandt, and the W7-X Team — Max-Planck-Institute for Plasma Physics, Greifswald, Germany

In stellarators, a self-generated radial electric field arises to fulfill ambipolarity and strongly shapes neoclassical transport by modifying particle orbits through the resulting (E × B) drift. In this contribution, we present an experimental method to infer the radial electric field from the dynamics of impurities injected via laser blow-off and analyzed through tomographic inversion of line-integrated soft-X-ray measurements. The analysis of the poloidal motion of the resulting radiation pattern, driven by the (E × B) drift, enables a reconstruction of the radial electric field. This method is applied and compared across similar plasma scenarios with forward and reversed magnetic field configurations.

Keywords: electric field; impurity injection; poloidal rotation