Parameters of High-Temperature Diffusion and Evaporation of Alloying Elements of Thermal Emission Cathodes

In a joint statement, nonlinear thermal and diffusion problems are solved by a numerical method to analyze the processes of heat and mass transfer and evaporation of activators of thermal emission cathodes for high-current plasma systems. For the two-dimensional diffusion problem, the boundary conditions are strictly formulated and nonlinear temperature dependences of the diffusion coefficients and evaporation rates of emissive and alloying elements are considered. Various mechanisms of activator diffusion are also studied together with the main regularities of heat and mass transfer and activator evaporation as functions of the system parameters.