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P: Fachverband Plasmaphysik

P 9: Poster I

P 9.23: Poster

Tuesday, March 29, 2022, 16:00–17:30, P

Effect of W7-X divertor geometry modifications on PFC heat load distribution — •Amit Kharwandikar, Dirk Naujoks, Thomas Sunn Pedersen, Felix Reimold, and The W7X Team — Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany

Wendelstein 7-X (W7-X) is an advanced stellarator device operated in Greifswald, Germany, to provide the proof of principle that the stellarator concept can meet the requirements of a future fusion reactor. It employs the island divertor concept to handle the heat and particle fluxes. In the recent experimental campaign OP1.2, ten adiabatically loaded test divertor units (TDUs) were installed in the plasma vessel along with baffles, toroidal/poloidal closures, etc. where high heat loads were observed onto the in-vessel components. Particularly, in the high-mirror magnetic configuration, undesired level of heat loads appeared on the baffles that limited the operation of the device. In some previous studies, it has been shown that the relative position of the divertor targets and the baffle affects the heat load distribution. This poster discusses the investigation of such geometry modifications via modelling. The diffusive field line tracing (DFLT) code - modified to also mimic plasma counter-flows - is used to simulate heat transport to the plasma facing components (PFCs). The aim of this activity is to understand the effect of these simple modifications (in terms of the relative position of targets and baffles) and optimize the same for an acceptable heat load distribution.