Hannover 2020 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 10: Poster Session 2
P 10.6: Poster
Dienstag, 10. März 2020, 16:30–18:30, Empore Lichthof
Plasma beta effects on the island divertor of Wendelstein 7-X — •Alexander Knieps1, Yunfeng Liang1, Yasuhiro Suzuki2, Carsten Killer3, Olaf Grulke3, Marcin Jakubowski3, Holger Niemann3, Yu Gao3, Olaf Neubauer1, Guruparan Satheeswaran1, Philipp Drews1, Dirk Nicolai1, Joachim Geiger3, Michael Endler3, and W7-X Team1,2,3 — 1Forschungszentrum Jülich, Jülich, Germany — 2National Institute for Fusion Science, Toki, Japan — 3Institut für Plasmaphysik, Greifswald, Germany
The Wendelstein 7-X (W7-X) stellarator relies on an island divertor for heat- and particle-exhaust. It aims to demonstrate long-pulse operation in fusion relevant performance regimes, aiming at a plasma beta of around 5%. At such performance levels, pressure-gradient-driven currents can modify the structure of the edge magnetic field. W7-X is a multi-configuration machine, and there are strong differences between the individual configurations’ responses to high plasma pressure. This work presents simulations of pressure-related magnetic field changes in multiple configurations, obtained using the HINT code. The beta-induced changes of the heat-fluxes onto the divertor targets are simulated using fieldline-diffusion and compared to experimental data obtained during the divertor campaigns of W7-X in 2017 and 2018.