Nonstationary theory of a relativistic carcinotron with an additional feedback

The effect of an additional feedback due to wave reflection at the ends of a corrugated waveguide on the dynamics of microwave excitation by a relativistic electron flux is investigated theoretically. It is shown that the introduction of an additional feedback in a system consisting of a relativistic electron flux and a backward electromagnetic wave gives rise to a self-modulation oscillation regime, with the amplitude field distribution of the excited wave along the interaction space length being a wave process. It is further shown that the starting current of the self-modulation regime in a system with an additional feedback is lower than in a completely self-consistent system.