Rombovsky M. Multiharmonic processes in the relativistic two-stream electron beams and systems on its base

The dissertation is devoted to a theoretical investigation of the multiharmonic processes in the relativistic two-stream electron beams and systems on its base.It is found out, that in a two-stream relativistic electron beam the realization of five different types of three-wave parametric resonance of beam waves is possible. Conditions are found out also, in which in a two-stream electron beam the realization of the multiharmonic modes of interaction is possible. It is shown, that the plural parametrical resonance effects of two kinds are realized, when the two-stream instability take place. The cubic nonlinear multiharmonic theory of the two-stream instability with allowance for plural parametrical resonances is constructed. Influence of these effects on formation of the broad abnormal spectrum is investigated. The nonlinear cubic theory of the electron-wave two-stream FEL with H ubitron pumping has been created. The analysis of saturation levels and satiation mechanisms has been made. Perspective of using of the given system as highly effective capacity amplifiers of mm-IR range with high level of monochromaticity has been proved.