Numerical predictions for the HT-7U divertor

HT-7U is a superconducting tokamak under construction in China. Its magnetically balanced double-null divertor is designed to accommodate the heat load due to a total heating power of 7.5 MW. In order to increase the degree of closure, the divertor structure is designed to consist of vertical targets, tightly fitting side baffles and dome baffles. To predict the details of the scrape-off layer and divertor plasma in different operational regimes and to assess the effects of the divertor geometry, two dimensional numerical calculations with the B2-EIRENE code package have been performed taking into account the real geometry of the HT-7U divertor. The results of the numerical predictions for the HT-7U divertor are to be described in this paper.