DETAILED RADIATIVE TRANSPORT MODELING OF A RADIATIVE DIVERTOR

An effective radiative divertor maximizes the utilization of atomic pr ocesses to spread out the energy deposition to the divertor chamber wa lls and to reduce the peak heat flux. Because the mixture of neutral a toms and ions in the divertor can be optically thick to a portion of r adiated power, it is necessary to accurately model the magnitude and d istribution of line radiation in this complex region. To assess their importance we calculate the effects of radiation transport using CRETI N, a multi-dimensional, non-local thermodynamic equilibrium simulation code that includes the atomic kinetics and radiative transport proces ses necessary to model the complex environment of a radiative divertor . We also include neutral transport to model radiation from recycling neutral atoms. This paper presents a case study of a high-recycling ra diative divertor with a typical large neutral pressure at the divertor plate to estimate the impact of H line radiation on the overall power balance in the divertor region with consideration for line opacities and atomic kinetics.