SMuK 2023 – scientific programme
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P: Fachverband Plasmaphysik
P 16: Plasma Wall Interaction II/Codes and Modeling I
P 16.2: Talk
Thursday, March 23, 2023, 14:30–14:45, CHE/0091
Multi-staged ERO2.0 simulation of material erosion and deposition in recessed ITER mirror assemblies — •Sebastian Rode1, Juri Romazanov1, Sebastijan Brezinsek1, Andreas Kirschner1, Sven Wiesen1, Tom Wauters2, Lucas Moser2, and Richard Pitts2 — 1Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung, 52425 Jülich, Germany — 2ITER Organization, 13067 St Paul Lez Durance, France
The Monte-Carlo code ERO2.0 traces impurity particles throughout the volume of fusion devices providing the local erosion and deposition fluxes at plasma-facing components or recessed objects, delivering important information about sputtering or layer growth on those components. In recessed areas, e.g. mirror assemblies in the diagnostic first wall (DFW) of ITER, the code is approaching its limits. The necessary resolution of information on mirrors more than 50 cm away from the LCFS cannot be achieved with standard simulations as only a tiny fraction of impurity test particles and a large fraction of charge exchange hydrogenic neutrals (CXN) reaches this volume. Multi-staged ERO2.0 simulations are employed to overcome this challenge: Impurity particles from a global ERO2.0 simulation with its boundary close to the DFW are collected and subsequently injected into local simulations. The number of test particles representing the fluxes is scaled up, achieving far superior resolution. The results show that the sputtering is largely dominated by high energy CXN, with the patterns indicating a strong influence by the geometry of the assembly. Overall neglible deposition is expected on the mirrors for the full ITER operation time.