The nature of energy exchange between a stream and a field in a surface wave generator is theoretically investigated in a high current relativistic electron stream with an electron energy of $\varepsilon_{0}=1$ MeV. It is shown that in systems which consist of sectors of smooth waveguides with periodic heterogeneities and transverse dimensions much greater than the working wavelength with the use of interaction between the stream and a field with a lower axially symmetrical mode at frequencies near the boundary of the transparency band it is possible to acquire an effect of cyclotron power amplification and an electron efficiency of interaction greater than 40%.
Ultrasonic Radiophysics Department, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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