SMuK 2023 – scientific programme

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P: Fachverband Plasmaphysik

P 11: Poster I

P 11.23: Poster

Wednesday, March 22, 2023, 14:00–15:30, HSZ EG

Mode analysis of high performance discharges at Wendelstein 7-X during OP 1.2 — •Charlotte Büschel, Kian Rahbarnia, Sara Vaz Mendes, Henning Thomsen, Christian Brandt, Ralf Kleiber, Axel Könies, and Wendelstein 7-X Team — Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany

During the last operational phase, the optimized stellarator Wendelstein 7-X achieved so-called high performance up to 1.1 MJ of diamagnetic energy. In most experiments the high energy phase only lasted for about 200 ms following a series of pellet injections. During the discharges Alfvén Eigenmodes (AEs) were recognized which show dynamic behaviour throughout the pulse. The AE activity is investigated in detail to determine the type of the AEs and their possible impact on the often abrupt ending of the high energy phase. To identify relevant frequencies with high precision the parametric model stochastic system identification is used. Additionally poloidal mode number spectra are calculated with the use of a nonuniform Fourier Transformation. Experimental findings are compared to theoretical predictions of Alfvén continua calculated by the 3D ideal MHD code CONTI.