SMuK 2021 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Poster I
P 5.17: Poster
Dienstag, 31. August 2021, 14:00–16:00, P
Challenges and expectations for the magnetic diagnostics during high-performance experiments at Wendelstein 7-X — •K Rahbarnia1, S Vaz Mendes1, J Schilling1, H Thomsen1, J Schmitt2, M Khokhlov1, T Bluhm1, B B Carvalho3, M Zilker1, and Wendelstein 7-X Team1 — 1Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany — 2Auburn University, Auburn, AL, USA — 3Instituto de Plasmas e Fusao Nuclear Instituto Superior Tecnico, Lisbon, Portugal
During the last experimental campaign at the Wendelstein 7-X stellarator the magnetic diagnostics were successfully operated. That involves equilibrium sensors, such as Rogowski coils, diamagnetic and saddle loops as well as Mirnov coils. The latter were used to study magnetohydrodynamic activity, which was mainly found within the frequency range up to 400 kHz and is of Alfvénic nature. Identifying their driving mechanism is crucial to understand the influence on plasma confinement properties. The measured data of the equilibrium sensors are suitable for equilibrium reconstructions, which are also relevant for the previously mentioned studies. In addition plasma energy and current measurements are directly embedded in machine safety systems, like the plasma heating interlock, and will in future campaigns also be integrated in the quench detection system. Fast and potentially critical plasma collapses are tracked and the impact on the main magnetic field coil system can be analysed. For future high-performance experiments electrical and mechanical improvements were implemented including an upgrade of the DAQ systems.