Relativistic microwave devices with postacceleration of an electron beam in the interaction space

We analyzed the possibility of improving the efficiency of microwave device s operating with relativistic electron beams in systems with particle posta cceleration in the interaction space. The fundamental feature of this appro ach is the formation of the accelerating-potential profile with the inheren t electric field of a high-current electron beam. It is shown that the use of the space-variant beam-potential sag helps raise the estimated efficienc ies of relativistic Cherenkov TWT and BWO up to values of about 50%. (C) 20 00 MAIK "Nauka/Interperiodica".