Cerenkov relativistic oscillators of coherent electromagnetic radiation with multimode sectioned electrodynamic systems

The results of the investigation of some versions of relativistic microwave devices with oversized electrodynamic systems are given. The coherence of the output radiation in the oversized system was achieved by the selective feedback In generators and the selective modulation of the electron beam in amplifiers. In all the versions studied a section of a wide-band TWT was used to amplify the power.