The Department "plasma Physics" MEPhI has developed a simple model for screening the plasma facing materials of tokamaks evaporated substance. Problems of interaction of the plasma with the surface of the walls of future fusion reactors occupy a key position in the ongoing program of controlled thermonuclear fusion. It is now known that during ELMs on the wall of the tokamak affects a huge pulsed heat loads, that can not only melt but also vaporize its surface layer. The vaporized material remains some time near the surface. Ionizes, he turns into a cloud of plasma consisting of heavy wall material and decrease the amount falling on the wall energy by conduction and re-emission.

In the theoretical group of the Department №21 the work on the development of an adequate theory of shielding. A recently developed simple model, from which it is visible, that with growth falling to wall energy share absorbed in the plasma goes to saturation. This effect is observed experimentally on equipment of the CPMS type. Calculations according to the developed model enabled to explain some of the experimental dependence. It is interesting, for example, that the saturation energy is determined mainly by the properties of the wall material, its thermal conductivity and the energy of evaporation. In this case, the radiative transfer and the dynamics of the cloud of evaporated material is logarithmically weak effect on the amount of energy saturation.