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P: Fachverband Plasmaphysik

P 1: Magnetic Confinment Fusion/HEPP I

P 1.5: Vortrag

Montag, 31. März 2025, 15:30–15:55, ZHG102

Reduced kinetic modelling of shattered pellet injection in ASDEX Upgrade — •Peter Halldestam¹, Paul Heinrich¹, Gergely Papp¹, Mathias Hoppe², Matthias Hölzl¹, István Pusztai³, Oskar Vallhagen³, Rainer Fischer¹, and Frank Jenko¹ — ¹Max Planck Institute for Plasma Physics, Garching b. München, Germany — ²Royal Institute of Technology, Stockholm, Sweden — ³Chalmers University of Technology, Göteborg, Sweden

Plasma-terminating disruptions are a critical outstanding issue for reactor-relevant tokamaks. ITER will use Shattered Pellet Injection (SPI) as its disruption mitigation system to reduce heat loads, vessel forces, and to suppress the formation of runaway electrons. In this work we demonstrate that reduced kinetic modelling of SPI is capable of capturing the major experimental trends in ASDEX Upgrade SPI experiments, such as dependence of the radiated energy fraction on neon content, or the current quench dynamics. Simulations confirm the experimental observation of no runaway electron generation with neon and mixed deuterium-neon pellet composition. We also show that statistical variations in the fragmentation process only have a notable impact on disruption dynamics at intermediate neon doping, as was also observed in experiments.

Keywords: tokamak disruption modelling; shattered pellet injection; ASDEX Upgrade