Simulation of Double-Null Divertor Plasmas with the UEDGE Code

Abstract

We describe recent modifications to the UEDGE code for simulation of full double-null magnetic configurations. We present simulation results for magnetically balanced double nulls, with and without asymmetries due to divertor recycling and cross-field drifts. Up/down electron temperature asymmetries due to recycling are weak for attached plasmas. Cross-field drifts due to radial electric fields produce strong ion particle fluxes through the private flux regions that drive up/down plasma asymmetries. Electrical currents through grounded divertor plates are sensitive to both recycling-driven and drift-driven asymmetries.