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P: Fachverband Plasmaphysik

P 12: Magnetic Confinement / Plasma Wall Interaction I

P 12.1: Vortrag

Mittwoch, 30. März 2022, 14:00–14:15, P-H12

Experimental observation and modelling of heat loads in W7-X and implications for transport — •David Bold, Felix Reimold, Holger Niemann, Yu Gau, Marcin Jakubowski, Carsten Killer, and the W7-X team — Max-Planck-Institut für Plasmaphysik, Greifswald, Germany

Modelling the scrape-off layer of a stellarator is challenging due to the complex magnetic 3D geometry. The here presented study analyses simulations of the scrape-off layer (SOL) of the stellarator Wendelstein 7-X (W7-X) using the EMC3-EIRENE code. Comparing with experimental observations, the transport model is validated.

Based on the experimentally observed strike line width, the anomalous transport coefficients, used as input to the code are determined to around 0.2 m²/s. This is however in disagreement with upstream measurements, where such small cross-field transport leads to temperatures higher than measured experimentally. Agreement can be improved by using spatially varying transport coefficients.

Even with spatially varying transport coefficients, differences remain, for example the toroidal heat flux distribution or the hollow temperature profile is not reproduced. Some of the differences could be explained by drifts. The future implementation of drifts into the transport model is expected to help overcome the discrepancies, and thus the development of SOL transport models including drifts is a necessary next step to study the SOL transport of the W7-X stellarator.