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P: Fachverband Plasmaphysik
P 5: Poster I
P 5.41: Poster
Dienstag, 31. August 2021, 14:00–16:00, P
Impurity parallel transport in ITER using improved collisional closure in the SOLPS-ITER code — •Sergei Makarov1, D Coster1, V Rozhansky2, E Kaveeva2, I Veselova2, S Voskoboynikov2, I Senichenkov2, A Stepanenko3, V Zhdanov3, and X Bonnin4 — 1Max-Planck-Institut für Plasmaphysik, Garching, Germany — 2SPbPU, St.Petersburg, Russia — 3MEPhI, Moscow, Russia — 4TER, St-Paul-Lez-Durance Cedex, France
Impurity transport in the Scrape-off layer of a tokamak is a challenging problem. Impurities occur in fusion plasmas naturally, for instance helium ash as a product of the D-T reaction, and artificially, for instance noble gasses are seeded into the tokamak for additional radiation and divertor target protection. When the impurity mass is significantly larger than the mass of the main ions the multispecies extension of the single ion Braginskii approach can be applied. However, usually impurity/main ion mass ratio can not be assumed infinitely large, and the Grad's 21N-moment method should be used for the transport coefficients estimation. This approach takes into account masses of ions are present in the plasma for coefficients calculation. It is the major improvement in comparison to the previous approach applied for the SOLPS-ITER code. This approach is implemented into the SOLPS-ITER code for multiple ion parallel transport description in collisional plasmas. The change in the impurity transport behavior in ITER is studied using improved method and taking into accout masses of ions. Significant differences are found in the ion transport, where the masses of ions are not sufficiently different.