Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Magnetic Confinement - Poster
P 12.2: Poster
Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal
Completion of magnetic diagnostics and bootstrap current studies at the stellarator Wendelstein 7-X — •K Rahbarnia1, T Andreeva1, T Bluhm1, B B Carvalho2, M Endler1, D Hathiramani1, J Geiger1, N Lauf1, U Neuner1, J Schilling1, H Thomsen1, Y Turkin1, M Zilker1, and W7-X Team1 — 1Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, 17491 Greifswald, Germany — 2Instituto de Plasmas e Fusao Nuclear Instituto Superior Tecnico, Lisbon, Portugal
About 90% of the magnetic diagnostic system at Wendelstein 7-X (W7-X) has been put into operation during the second operational phase OP1.2a, August-December 2017. The diagnostic system consists of 3 diamagnetic loops, 6 Rogowski coils arrangements, 40 saddle coils and 125 Mirnov coils, distributed in all 5 modules of W7-X. Data recording and storing of raw signal streams into the W7-X archive database has been fully automatized via the central operation control system. Automatized data analyzing software, implemented in the MINERVA framework, calculates magnetic fluxes of all sensors, as well as the compensated diamagnetic energy and plasma current. The pre-analyzed data is written into the W7-X archive database directly after each plasma pulse. Plasma pulse duration of up to 20 s in combination with plasma density feedback control allows detailed studies of the bootstrap current. The experimental results are complemented by theoretical predictions. The minimization of bootstrap currents in dedicated magnetic field configurations, which are optimized for low plasma current and future long pulse operation, has been confirmed.