Using the approximate theory of interaction between the electron flow and runing electromagnetic wave in large signals regime by the method of approaches succesive are carried out calculation of a main energetic characteristics of generator with rezonator as part of helix slow-wave system. Physical peculiazities of interaction elektrons with field of passing electromagnetic wave arl discussed. Dependences of main integral output characteristics of generator about electrodynamic system geometry and beam characteristics are obtained. The means of their essential improvement are found out.

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