SOLPS modelling of edge plasma and impurity transport in EAST

The newly developed SOLPS-ITER code package has been used to investigate the effects of drifts on the in-out/up-down asymmetry of divertor heat/particle fluxes in EAST. Characteristics of the divertor heat/particle fluxes in a double null (DN) discharge with BxΔB points to the upper and lower directions have been investigated by SOLPS-ITER calculations. It is found that the classical drifts will directly affect the parallel plasma flow velocity, and thus affect the divertor asymmetry of particle fluxes. The divertor heat fluxes can also be affected, but not so evidently as that for the divertor particle fluxes. Besides, the influences of classical drifts on the transport properties of W impurity have been investigated by performing the coupled SOLPS-DIVIMP modeling, finding that the leakage of the W impurity from the divertor region to the core will be greatly affected, due to the fact that friction force exerted on the impurity ions has been greatly affected. (author)