Divertor power spreading in the Divertor Tokamak Test facility for a full power scenario with Ar and Ne seeding

Abstract

This work describes integrated numerical modelling applied to DTT scenarios with tungsten wall and divertor in single null configuration 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. COREDIV code simulations have been performed and compared to the already published solutions from JETTO done for DTT full power discharges with Ar seeding. The influence of the particle transport on the fueling and flux to the plate are analysed. The main conclusion from the performed simulations, is that Ne and Ar radiate effectively in the SOL and no difference was found in the fueling properties between them. The fueling increases with increasing of radial transport in the core region. It has been found that the rise in the diffusion in core plasma have a small influence on the several global
plasma parameters: plasma radiation, impurity concentration, fluxes to divertor plate, but have strong effect on the fueling. The fueling and deuterium flux to the plate decrease almost linearly with decreasing plasma density, keeping ⟨ne⟩/nesep = constant.