The interaction of an electron beam with the field of the electrodynamic system of a relativistic carcinotron is analyzed in a linear approximation. Consideration is given not only to the interaction of the electron flux with the field of the (-1 )th space harmonic of a backward wave, but also to the field of the 0th space harmonic of a forward wave. The presence of this wave is due to the carcinotron design, where the microwave energy is taken out towards the electron collector. The effect of interaction with the forward wave on the starting conditions of the oscillator is demonstrated by an example of a concrete mock-up of a relativistic backward-wave tube.
Department of Physical Electronics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia