München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.111: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

3D Impurity Migration in Fusion Experiments using WallDYN and EMC3-EIRENE — •Lennart Bock1,2, Klaus Schmid2, and Tilmann Lunt21Physik-Department E28, Technische Universität München, 85747 Garching, Germany — 2Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany

The wall of a fusion experiment is subject to bombardment by energetic ions from the plasma, which leads to sputtering of wall material and retention of incoming ions. Sputtered wall material is transported through the plasma and eventually redeposited on the wall. This process is called impurity migration and controls net erosion of the wall, impurity content in the plasma and retention of ions in the wall. The global impurity migration code WallDYN calculates the surface composition and impurity fluxes self consistently by combining models for implantation, erosion and reflection of impurities with a model for transport through the plasma. WallDYN has previously been coupled to the 2D code DIVIMP (WallDYN2D) and thus was limited to toroidally symmetric geometries. While for Tokamaks the plasma is essentially toroidally symmetric, the first wall is not. Including the effect of toroidally asymmetric wall features or modeling devices like Stellarators requires a full 3D impurity transport model. Therefore, WallDYN is now coupled to the 3D code EMC3-EIRENE (WallDYN3D). This contribution compares WallDYN3D in a toroidally symmetric geometry to results from WallDYN2D and demonstrates how WallDYN3D can describe impurity migration in a fully 3D geometry.

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