Non-stationary theory of relativistic carcinotron with additional feedback

Consideration is given to results of theoretical study of the influence of additional feedback due to wave reflection on the faces of corrugated waveguide on dynamics of excitation of high-frequency oscillations by relativistic electron beam. Self-consistent system of equations describing nonlinear dynamics of beam interaction with corrugated waveguide segment is obtained. Numerical analysis of this system of equations is conducted for different values of beam current and reflection coefficients. It is shown that introduction of additional feedback in the beam-backward wave system leads to formation of self-modulation mode of oscillation generation. It is established that starting current of self-modulation in the system with additional feedback is lower as compared to completely consistent system. The optimal mode of wave excitation from the viewpoint of achieving the maximal efficiency is determined. 14 refs.; 6 figs