SMuK 2023 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: HEPP VII

P 18.2: Vortrag

Donnerstag, 23. März 2023, 16:10–16:35, CHE/0091

Grad-Zhdanov multi-ion collisional closure for fluid edge codes — •Sergei Makarov and David Coster — Max-Planck-Institut für Plasmaphysik, D-85748 Garching, Germany

Moments of the distribution function form an infinite sequence of fluid equations. For the specific cases, this system can be cut to the finite amount of equations. For doing this we use, so called closure. In collisonal plasmas, which can be observed in the Edge and Scrape-off layer (SOL) in fusion magnetic devices, a collisional closure can be applied. 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, for ions with close masses the Grad-Zhdanov 21N-moment method should be used for the transport coefficients estimation. It is necessary, for example, when He plasmas or D-T plasmas are considered. This approach takes into account masses of ions for kinetic coefficients calculation. It is the major improvement in comparison to the previous approach applied for the SOLPS-ITER code. Only hydrogen isotope plasma with heavy impurities could be treated by SOLPS-ITER versions prior to 3.0.8. This approach is implemented into the SOLPS-ITER code for multiple ion parallel transport description in collisional plasmas. The particular approach is discussed in. The complete multi-ion generalization of the SOLPS-ITER code has been preformed without explicit separation between main and impurity species. The new code is tested for the He and D-T mixtures. The new effects coming from the improved multi-ion treatment are analyzed.