A Self-Consistent Analysis of Impurity Radiation by SOL-PSI Model

A model of scrape-off layer (SOL)-plasma surface interaction (PSI) coupling is presentedfor divertor operation. This model can treat the interrelation between impurity productionand impurity radiation self-consistently. The model is based on a ’two-point’ model and a 0-Dsteady state impurity particle balance model. The fraction of power radiated in SOL is calculatedas a function of the line average density. Compared to the former simple coupling model,this model takes into account the wall-produced impurities that are sputtered by charge-exchange(CX) neutrals. A simple retention factor is also added in this model. A comparison with theexperiments is made. The simulation results show the same trend upon the plasma density asshown in experiments. Reasonable qualitative agreement is reached between the results by usingthe model and those from experiments through the adjustment of the fitted factor.