München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.117: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

SOLPS Modeling of Impurity Seeded Plasmas in ASDEX Upgrade — •Ferdinand Hitzler1,2, Marco Wischmeier1, Felix Reimold3, Matthias Bernert1, Arne Kallenbach1, David Coster1, the ASDEX Upgrade Team4, and the EUROfusion MST1 Team51IPP Garching, Germany — 2TU München, Garching, Germany — 3IPP Greifswald, Germany — 4See author list in "A. Kallenbach et al., 2017 Nucl. Fusion 57 102015" — 5See author list in "H. Meyer et al 2017 Nucl. Fusion 57 102014"

In future fusion devices like ITER or DEMO, parallel power fluxes in the order of several GWm−2 at the midplane have to be reduced to perpendicular divertor target loads below 5−10 MWm−2 to prevent severe damage of plasma facing components. To avoid sputtering of target material also the electron temperature at the target needs to be limited. This can be achieved by controlled impurity seeding which leads to radiative power dissipation. To provide a sufficient reduction of the power flux and target temperature while at the same time minimizing the impact on the confined plasma, it will be crucial to identify an “optimum” seeding recipe. SOLPS modeling of an ASDEX Upgrade H-mode discharge is used to investigate how different mixtures of argon and nitrogen seeding influence the radiation patterns, which depend on the radiation efficiencies and impurity density distributions. Following the analysis of the underlying mechanisms it is discussed which mixture of seeding species could be most promising for future experiments. Finally, a validation of the results using experimental data and an outlook on the impact of fluid drifts on the result will be given.

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