Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 13: Magnetic Confinement

P 13.10: Poster

Dienstag, 14. März 2017, 16:30–18:30, HS Foyer

Completion of magnetic diagnostics at Wendelstein 7-X stellarator — •K Rahbarnia1, T Andreeva1, B B Carvalho2, M Endler1, D Hathiramani1, J Geiger1, S Lazerson3, U Neuner1, J Svensson1, H Thomsen1, A Werner1, M Zilker1, and W7-X Team11Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany — 2Instituto de Plasmas e Fusao Nuclear Instituto Superior Tecnico, Lisbon, Portugal — 3Princeton Plasma Physics Laboratory, Princeton, NJ 08540, USA

During the first operation phase (OP 1.1) of Wendelstein 7-X about 50% of the magnetic sensors, i.e. diamagnetic loops, Rogowski and saddle coils were commissioned. The measured diamagnetic energies and plasma currents are in reasonable agreement with theoretical predictions and results of other diagnostics (Thomson scattering, Bolometry) with respect to absolute values, confinement times and global energy balance. The completion of the equilibrium diagnostics in OP 1.2 (start summer 2017) allows a precise reconstruction of magnetic equilibria complemented by calculations using STELLOPT. Based on the diamagnetic flux measurement an interlock signal is generated to avoid damage of machine and diagnostics due to continued heating after a sudden plasma breakdown. Previous fluctuation measurements during OP 1.1 using 4 Mirnov coils clearly showed mode activity in the low kHz-range (∼ 7 kHz) as well as potential alfvénic behaviour in the 100 kHz-range. The completion of the Mirnov diagnostic (125 sensors) allows more detailed investigations and cross-comparisons to other fluctuation diagnostics, like reflectometry and soft X-ray tomography.

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