EMC3-EIRENE modelling of 3D impurity transport in argon seeded EAST discharges

The transport property of impurities in the edge plasma is one of the most critical issues for the operation and performance of the fusion devices. The radiation of impurities during penetration into the confinement region of the plasma would lead to the degradation of energy confinement and even the termination of plasma discharge, which imposes constraints on routine operation of fusion facilities. Moreover, transport of eroded impurities leads to the build-up of tritium-rich layers in the shadowed and remote areas, which has a stringent limit on the viability of a future reactor due to safety and economy considerations. However, on the positive side, a good control of the edge impurity radiation would lead to a strong reduction of power load on divertor target plates. Therefore, studies of edge impurity transport are important to obtain a better understanding of the underlying mechanisms of impurity screening and detached divertor plasma.