Double-mode O-type oscillator-amplifier with inclined focusing field

Resonant O-type oscillator-amplifier with prolonged interaction is considered. Conditions of the simultaneous excitation of the oscillations on the surface and bulk waves are implemented in this device. Theoretical analysis is performed on the basis of nonlinear multidimensional theory of the beam-wave interaction. It is shown that focusing field incline results in efficiency enhancement in the surface wave mode and bulk waves mode on the harmonics of electron beam bunching frequency.