Abstract
A semi-analytical model has been developed to describe the boundary region between the plasma and the wall in the presence of a moving neutral gas blanket. This study shows that the velocity of the gas blanket is determined by the particle and heat fluxes out of the plasma, the thickness of the neutral gas blanket and the cross field diffusion. In order for the gas blanket to be small, as required by reactor considerations, the gas blanket velocity has to be relatively large. The variation of the neutral gas blanket performance as a function of the plasma, wall and gas blanket parameters is examined and numerical examples are given.
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