SMuK 2021 – scientific programme

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P: Fachverband Plasmaphysik

P 17: Poster II

P 17.26: Poster

Friday, September 3, 2021, 14:00–16:00, P

Divertor optimization for the stellarator experiment W7-X — •Amit Kharwandikar, Dirk Naujoks, Thomas Sunn Pedersen, Felix Reimold, and The W7X Team — Max Planck Institute for Plasma Physics, Greifswald, Germany

The Wendelstein 7-X (W7-X) is an advanced stellarator device operated in Greifswald, to provide the proof of principle that the stellarator concept can meet the requirements of a future fusion reactor. To fulfil this goal, several experimental campaigns have been conducted over the years. In the recent OP1.2 campaign, ten adiabatically loaded divertor units (Test Divertor Units (TDU)) have been installed in the plasma vessel together with baffles, toroidal/poloidal closures, etc. During the experiments, high heat loads onto in-vessel components have been observed, that exceed the specified limits under certain conditions. This immediate concern and the need to transition to fusion reactor relevant material (e.g. Tungsten) for plasma facing components (PFC) to achieve the long-term goals, motivate the need for a new divertor design. This poster discusses the investigation of the physics basis for such a new divertor concept with the objectives as heat load reduction and high gas exhaust. The important technical constraints are specified as well as the main modelling tools to be used, namely the Field Line Transport (FLT) code and EMC3-Eirene. As a current activity, example applications of FLT for studying erosion-redeposition and certain baffle overload scenarios have been described. Finally, the main conceptional ideas to achieve the desired optimized plasma facing surface for the W7-X divertor and baffle are presented.