Abstract
The possibility of parallel amplification of various wave modes in the case of their synchronism with a single electron beam is analyzed theoretically. The specific features and the basic characteristics of this process are studied with the use of an elementary model of a relativistic Cherenkov traveling-wave tube in which two waves with counterclockwise and clockwise rotation of the transverse structure interact with an electron beam. It is demonstrated that, in the case of sequential electrodynamic coupling of operating waves, this approach can be used to achieve a high gain in a relativistic traveling-wave tube and retains typical values of other parameters (electronic efficiency, amplification band, etc.).
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