To the non-linear self-consistent theory of the EH-Ubitron type three-waves parametric amplifier

Linear and non-linear stages of interaction in the EH-ubitron type three-waves parametric amplifier have been investigated. It was shown, that the influence of vortex electric field of pump leads to increasing of electron beam modulation on the linear stage of interaction. On the nonlinear stage of interaction, influence of vortex electric field leads to the realization of the partial compensation of electron beam energy effect. This effect is accompanied by non-linear stabilization of non-coordination phase. Two isochronical high effective models of EH-ubitron type three-waves parametric amplifier have been investigated.