Numerical studies on JT-60 divertor plasma characteristics

The characteristics of divertor plasma in JT-60 were numerically studied both for Joule heated plasma and for high power heated one. The effects of parameters related to divertor plasma or main plasma on these characteristics were analyzed. The former parameters include divertor chamber shape, divertor configuration, width of scrape-off layer, effective pumping speed, radiation loss and so on. The latter parameters include main plasma density, input power, particle diffusion coefficient and safety factor. The dominant parameters on divertor plasma characteristics and the conditions required to produce cold and dense divertor plasma were clarified. In order to investigate the above subject, a new simulation model was developed by which both divertor plasma and main plasma can be consistently analyzed. (author)