In current-carrying fusion devices, the conversion of a large fraction of the plasma current to runaway electrons (RE) following the sudden loss of thermal energy poses a threat to the integrity of the plasma vessel. However, RE formation may be suppressed by massive material injection (MMI); a concept presently being investigated experimentally across various devices. To complement extrapolation to future devices, RE model development and validation is mandatory. In this talk, we present the 1.5D transport toolset ASTRA-STRAHL for the simulation of RE generation during MMI scenarios. The toolset is then applied in first-time integrated simulations of MMI, background plasma response, and RE generation in ASDEX Upgrade (AUG). Employing state-of-the-art models for RE generation considering the impact of partially ionized impurities, the evolution of key plasma parameters (plasma current decay, line integrated electron density, etc.) is calculated well in agreement with experimental observations of AUG. Considering instead commonly used formulae without the impact of these impurities, simulations cannot capture experimental trends, thus demonstrating the importance of these kinetic effects on RE generation.
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