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P: Fachverband Plasmaphysik

P 9: Poster I

P 9.9: Poster

Dienstag, 29. März 2022, 16:00–17:30, P

Simulation of the neutral gas pressure in the subdivertor region of Wendelstein 7-X with ANSYS — •Victoria Haak¹, Hugo Cu Castillo², Dirk Naujoks¹, Uwe Wenzel¹, Georg Schlisio¹, and W7-X Team¹ — ¹Max-Planck Institute for Plasma Physics, Greifswald, Germany — ²University of Greifswald, Greifswald, Germany

For low neutral gas pressures, the behaviour of the neutral gas in the subdivertor region of Wendelstein 7-X is governed by molecular flow conditions, i.e. collisions between particles can be neglected. After hitting the walls in the subdivertor region, the particle flux is emitted according to Lambert's cosine law. These similarities between particle flow in the molecular regime and radiation transport are used in order to simulate the neutral gas pressure in the subdivertor region with the steady-state thermal analysis module in ANSYS. This module uses the angular coefficient method to calculate the radiation flux on the individual surfaces. Using the analogy between particles and radiation, the heat flux can be converted into neutral gas pressure by a so-called scaling factor. The distribution of the neutral gas pressure on the walls of the subdivertor region as well as the influence of pumps and leaks can be studied. The results are compared to other simulation results, e.g. from EMC3-EIRENE and to experimental results obtained from neutral gas pressure measurements during OP1.2b using neutral gas pressure gauges.