München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.104: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

SOLPS simulations for alternative configurations in the future upper divertor in ASDEX Upgrade — •Ou Pan1,2, Tilmann Lunt1, Marco Wischmeier1, David Coster1, Ulrich Stroth1,2, and the ASDEX Upgrade Team11Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany — 2Physik-Department E28, Technische Universität München, 85747 Garching, Germany

High heat loads on the plasma facing components of tokamak divertors impose serious constraints on the achievable performance of future fusion reactors. ASDEX Upgrad recently decided to modify the upper divertor [1] to study alternative divertor configurations which are currently discussed as a possible solution for the power exhaust problem. In this work, we report on SOLPS simulations for a low-field side snow-flake minus (LFS SF-) divertor configuration [2] where the geometrical splitting of the scrape-off layer as well as the enhanced connection length and divertor volume would help to reduce the maximum heat flux. Compared to a standard single null configuration with the same external input parameters, upstream profiles and impurity concentration at the separatrix, the LFS SF- configuration shows significantly higher impurity radiation and volumetric recombination, which lead to a divertor detachment at a lower impurity seeding rate. In addition to this, the first SOLPS-ITER simulation for such a LFS SF- configuration with fully activated drifts will also be shown and discussed. [1] T. Lunt, et al., Nucl. Mat. Energy 12 (2017) 1037 [2] D. Ryutov, et al., Plasma Phys. Control. Fusion 54 (2012) 124050

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