Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 11: Helmholtz Graduate School - Poster
P 11.14: Poster
Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal
SOLPS Modeling of Partially Detached Plasmas in ASDEX Upgrade — •Ferdinand Hitzler1,2, Marco Wischmeier1, Felix Reimold3, Matthias Bernert1, Xavier Bonnin4, Arne Kallenbach1, the ASDEX Upgrade Team1, and the EUROfusion MST1 Team5 — 1IPP Garching, Germany — 2TU München, Garching, Germany — 3Forschungszentrum Jülich, Jülich, Germany — 4ITER Organization, St. Paul-lez-Durance, France — 5See author list "H. Meyer et al 2017 Nucl. Fusion 57 102014"
Power exhaust will be a critical issue for future tokamak fusion devices. The unmitigated power loads at the divertor targets can easily exceed the foreseen material limit of 10 MWm−2. To prevent severe damage of plasma facing components these power loads have to be reduced significantly. This can be achieved by increased fueling and controlled seeding of impurity species like nitrogen or argon. The resulting high densities and low target temperatures lead to the so-called detachment state, which is characterized by strongly reduced target power fluxes.
In this contribution impurity seeding of nitrogen and argon is investigated via SOLPS modeling. The radiation efficiencies of the seeded impurities are discussed and compared to expectations from atomic databases. It can be observed, that the effective radiation efficiencies in the simulation are enhanced due to impurity transport which leads to a deviation from the coronal equilibrium. The code results will be validated with selected ASDEX Upgrade H-mode discharges with a particular focus on the comparison of the impurity radiation patterns using spectroscopic data and synthetic diagnostics in the simulation.