Mainz 2022 – scientific programme

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P: Fachverband Plasmaphysik

P 19: Poster II

P 19.17: Poster

Thursday, March 31, 2022, 16:00–17:30, P

Ion mass ratio impact on the collisional closure in the SOLPS-ITER Scrape-off layer simulations — •Sergei Makarov¹, David Coster¹, and Vladimir Rozhansky² — ¹Max-Planck-Institut für Plasmaphysik, D-85748 Garching, Germany — ²Peter the Great St.Petersburg Polytechnic University, 195251, St.Petersburg, Russia

Impurity transport in the Scrape-off layer of a tokamak is an important and challenging problem. 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-Zhdanov 21N-moment method should be used for the transport coefficients estimation. This approach takes into account realistic 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. New approach is implemented into the SOLPS-ITER code for multiple ion parallel transport description in collisional plasmas. Previously, the sufficient change in the impurity transport is found when the realistic mass ratio between different ion species is taken into account. Here we explore the origin of this impact. The mass ratio between different species is artificially increased in the collisional terms calculation. The improved approach turns into the standard SOLPS-ITER model, for artificially increased mass ratio.