Heat and particle flow distribution and possibility of helium separation in the divertor channel of a tokamak reactor

The stationary plasma parameter distribution in the divertor layer of a tokamak reactor is investigated. The distributions of plasma density, electron and ion temperatures as well as the longitudinal and transverse heat and particle fluxes are found as functions of neutral-atom re-cycling and the conditions of secondary electron emission from the collector plates. The possibility of helium separation in the divertor channel due to the different backflow conductivities of the channel for hydrogen and helium atoms is considered. The values of the relative helium concentration in the divertor volume are obtained for different plasma and channel parameters. (author)