Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 11: Helmholtz Graduate School - Poster
P 11.28: Poster
Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal
SOLPS modelling for future snowflake- and X-divertor configurations in ASDEX Upgrade — •Ou Pan1,2, Tilmann Lunt1, Marco Wischmeier1, David Coster1, and The ASDEX Upgrade Team1 — 1Max-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. Instead of a standard single null (SN), an alternative divertor configuration such as snowflake- (SF) [1] or X-divertor (XD) [2] may mitigate these problems. Here we focus on a LFS SF- configuration where a secondary X-point is located at the low field side scrape-off layer (SOL) near the primary one. The geometrical splitting of the SOL as well as the enhanced divertor volume may help to reduce the maximum heat flux. The XD could enhance the divertor thermal capacity through a flaring of the field lines only near the divertor plates. In this work, the SOLPS code package is used to model the L-mode edge plasma for LFS SF- and XD configurations of ASDEX Upgrade upper divertor that will be upgraded in the near future [3]. With sufficient input power and nitrogen gas puff, simulations predict lower heat fluxes to the targets and higher radiative fractions in the LFS SF- case than that in the SN case with similar impurity concentrations at the separatrix. [1] D. Ryutov, et al., Plasma Phys. Control. Fusion 54 (2012) 124050 [2] M. Kotschenreuther, et al., Phys. Plasmas 14 (2007) 072502 [3] T. Lunt, et al., Nucl. Mat. Energy 12 (2017) 1037