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P: Fachverband Plasmaphysik

P 12: Poster II

P 12.21: Poster

Dienstag, 27. Februar 2024, 16:30–18:30, ELP 6: Foyer

Plasma-neutrals fluid turbulence modeling in the tokamak edge — •Konrad Eder, Wladimir Zholobenko, Andreas Stegmeir, and Frank Jenko — MPG-IPP, Garching, Germany

Predictive studies of the plasma edge in prospective fusion reactors require self-consistent modeling of the turbulent transport involving an interplay of plasma, neutral gas, and impurity dynamics.

We present extensions to the edge turbulence code GRILLIX, which implements a drift-fluid plasma model and a diffusive neutral gas model. The latter has been upgraded to a 3-moment fluid, i.e. neutral gas density, momentum, and pressure. Furthermore, we show a scheme to implement neutrals recycling for the Flux-Coordinate-Independent (FCI) approach, on which GRILLIX is based and which enables it to handle complex diverted geometries.

The updated model is validated against ASDEX-Upgrade L-mode discharge #36190, demonstrating improved agreement in the divertor profiles of density and electron temperature. We note that: first, the recycling boundary conditions allow for a more realistic in-homogeneous neutrals distribution at the divertor. Second, the evolution of neutrals temperature allows it to decouple from the ion temperature, causing significant change in the poloidal morphology.

Simulations of a density ramp in AUG are carried out, which aim to reproduce detached divertor regimes observed in experiments. Finally, in fully detached conditions, we perform simulations with an X-point radiator to study its impact on turbulent transport, paving the way for predictive reactor simulations of ELM-free regimes.

Keywords: Tokamak physics; Plasma edge; Plasma-neutrals fluid turbulence; Divertor detachment; X-point radiator