Tungsten divertor plasma simulation with bundled charge state model by SOLPS-ITER on EAST

This work focuses on the comparisons of several bundledcharge state models of W and the all W ion model in low and high recycling divertor operational regimes. It is found that bundled chargestate models have a pronounced effect on the reduction of computational time and computer memory and provide an improved marked codespeed by a factor of more than five.

In the low recycling regime, compared to the full W charge state model, the differences in the plasmaparameters at both divertor targets are within 15% for different bundling schemes. In the high recycling regime, no significant differencebetween bundled charge state models and the all charge state model is observed due to the very low W concentration (∼10 −6 ). It, therefore,indicates thatbundled charge state models ofW can describe divertorparameters well to aconsiderable degree.