Self-consistent modeling of disrupted plasma and runaway electrons using the coupled DTRAN/CQL3D codes

CompX is developing an integrated code, in which kinetic 2V-1.5D Fokker-Planck code CQL3D is coupled to new macroscopic transport code DTRAN (Disruption TRANsport). Here we report on progress in development of DTRAN as multispecies, 1.5D magnetic-flux-surface averaged plasma parameters, diffusive-convective transport code, which 1) solves a system of many strongly coupled equations for plasma densities/temperatures, ionization states of impurity species, neutral atoms, molecules, and for magnetic fluxes and electric currents; 2) incorporates quasi-static magnetic geometry evolution based on GSE; 3) solves equations for impurity pellet propagation, ablation, and assimilation of an emergent impurity cloud by the thermal plasma, and for the subsequent MGI pulses. The modeled disruption mitigation scenario causes radiative collapse of plasma down to a few eV and lower, changes magnetic configuration, enhances PMI processes, modifies parallel electric field, and can result in a highly non-Maxwellian time-dependent RE distribution calculated by CQL3D featuring a relativistic RE tail, which in turn affects the plasma current, radiation and ionization degree. Initial results on these comprehensive coupled processes modeling with DTRAN/CQL3D will be presented and discussed. Research supported by DOE grant DE-FG02-04ER54744