Modelling of runaway electron dynamics during argon-induced disruptions in ASDEX Upgrade and JET

Abstract Disruptions in tokamak plasmas may lead to the generation of runaway electrons that have potential damage plasma-facing components. Improved understanding process requires interpretative modelling experiments. In this work we simulate eight discharges ASDEX Upgrade and JET tokamaks, where argon gas was injected trigger disruption. We use a fluid framework with capability model through hot-tail, Dreicer avalanche mechanisms, as well electron losses. Using experimentally based initial values plasma current temperature density, can reproduce evolution using realistic assumptions about assimilation plasma. The results are similar for modelled JET. For Upgrade, comparatively high, had assume large fraction hot-tail were lost order measured evolution.