Hannover 2020 – scientific programme

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P: Fachverband Plasmaphysik

P 10: Poster Session 2

P 10.9: Poster

Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof

Towards nonlinear simulations of mitigated disruptions in ASDEX Upgrade — •Fabian Wieschollek, Matthias Hölzl, and Sibylle Günter — Max Planck Institute for Plasma Physics, 85748 Garching bei München, Germany

Disruptions constitute a significant threat for large-scale tokamak devices due to associated massive heat loads and mechanical stresses. Hence, disruptions have to be studied extensively to improve detection, avoidance or mitigation schemes. One promising tool for disruption mitigation foreseen also for the ITER tokamak are shattered pellet injections (SPI), where pellets consisting of Deuterium or low-Z impurities like Neon or Argon are injected after shattering.

Simulations of mitigated disruptions in ASDEX Upgrade using the nonlinear MHD code JOREK are under preparation. We investigate SPI both into unperturbed plasmas and into configurations that exhibit disruption precursors, to understand the effectiveness of SPI depending on plasma dynamics. First results for deuterium SPI are shown. For realistic simulations of impurity-SPI, JOREK needs to be extended. We plan to trace each charge state of the impurities separately using a coronal model. First tests and further plans are shown.