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P: Fachverband Plasmaphysik

P 16: Poster Session Plasma Physics

P 16.99: Poster

Thursday, March 19, 2026, 13:45–15:45, Redoutensaal

Transient non-equilibrated plasma phases in the Wendelstein 7-X stellarator — •Christian Brandt, Charlotte Büschel, Edith Victoria Hausten, Kian Rahbarnia, Henning Thomsen, Sara Vaz Mendes, Tamara Andreeva, Martin Clifton Kelly, Ulrich Neuner, and Pedro Pons Villalonga — Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany

Selected Wendelstein 7-X stellarator plasmas are investigated far away from an equilibrium state in certain experimental scenarios. A stable plasma phase was actively perturbed, e.g. by heating power steps, the injections of cryogenic pellets or impurities. Moreover, internal events temporarily destabilized the plasma, triggered by MHD instabilities. Analysis of highly spatiotemporally resolved soft X-ray (SX) tomographic measurements help to understand these transient phases by studying the topologic evolution of the SX emissivity in a poloidal cross section. An experimental survey of several types of transient phases analyzed by SX tomography is presented. Besides details of the plasma startup phase – sometimes accompanied by mode activity – we focus on the stability of high energy plateau phases.

Keywords: x-ray, tomography, inversion, MHD; ECRH, NBI, LBO, TESPEL; modes, Alfvén waves, KBM; pellet, cryogenic, startup