Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 20: Plasma Wall Interaction II - Poster
P 20.1: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Zelt West
3D global impurity transport modeling with WallDYN and EMC3-Eirene — •Lennart Bock1,2 and Klaus Schmid2 — 1Physik-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 impurity transport through the plasma. In WallDYN the impurity transport is described by the 2D code DIVIMP and thus 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 like poloidal limiters or modeling other devices like stellarators therefore requires switching to a full 3D impurity transport model. For WallDYN this means switching from the 2D code DIVIMP to the 3D code EMC3-Eirene.
In this contribution the implementation of EMC3-Eirene to WallDYN is described and impurity transport models of DIVIMP and EMC3-Eirene are compared with focus on their validity range.