SMuK 2023 – scientific programme

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P: Fachverband Plasmaphysik

P 12: Poster II

P 12.39: Poster

Wednesday, March 22, 2023, 17:30–19:00, HSZ EG

Modelling the effects of geometry modifications on the divertor heat loads of W7-X — •Amit Kharwandikar, Dirk Naujoks, Felix Reimold, Ralf Schneider, Thomas Sunn Pedersen, 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, unacceptably high heat loads limited the operation of the device. This immediate concern and the need to investigate a subsequent transition to fusion reactor relevant material (e.g. tungsten) for plasma facing components (PFCs) motivate the need for an improved divertor design. This poster discusses the investigation of such an optimized divertor via modelling. The simplified heat transport code, EMC3-Lite, is used as a fast tool to assess different design modifications of the current high-heat-flux (HHF) divertor. Moreover, using the functionalities of the code, a further reduced model for heat load calculations primarily depending on the inclination of magnetic field lines on the plasma-facing surface (PFS) and their connection lengths is derived. This new model introduces the possibility to gain insights into the main parameters determining heat loads and add more physics effects (e.g. radiation loss) in an attempt to fit with experiments. Finally, an iterative scheme for finding an optimum PFS is proposed.