Integrated core–SOL simulations for SPARC tokamak with the COREDIV code

Abstract

This work describes integrated numerical modelling applied to SPARC tokamak scenarios with tungsten wall and divertor using the COREDIV code, which self-consistently solves 1D radial transport equations of plasma and impurities in the core region and 2D multi-fluid transport in the SOL. The model is self-consistent with respect to both the effects of impurities on the α-power level and the interaction between seeded neon (Ne) and intrinsic impurities (tungsten (W), helium (He)). The effect of the impurity seeding on fusion performance and SOL/divertor parameters has been investigated for baseline scenario characterized by Ip=8.7 MA, Btor=12.2 T, with different auxiliary heating powers: 11 MW, 13 MW, 15 MW and 20 MW and with neon seeding. For the case with plasma density ne=3.1×1020 m−3 the L–H power threshold is PLH≈30 MW and a possibility of the work in H - mode has been found for the auxiliary heating higher than 13 MW.