CQL3D Fokker-Planck modelling of runaway electrons in the DIII-D tokamak at reactor-relevant electron temperatures

In this contribution, we model the formation of Runaway-Electrons (REs) in the DIII-D tokamak at reactor-relevant electron temperatures (1-12 keV) using the Bounce-Averaged Fokker-Planck (FP) code CQL3D. Thermal Quench (TQ) events are initiated with Ar pellet injection to create REs where the TQ times are taken from recent DIII-D experiments [1]. FP calculations are coupled to the Ampere-Faraday (AF) equations to study the self-consistent conversion of pre-disruption thermal current to RE current as a function of the pre-disruption electron temperature. The impact of these results are discussed together with future steps towards improved FP modelling of RE production via pellet injection in tokamak plasmas.



[1] C. Paz-Soldan et al 2020 Nucl. Fusion 60 056020