AMPLIFICATION AND EXCITATION OF MICROWAVES BY AN ELECTRON BEAM IN A DISK-LOADED COAXIAL HYBRID WAVEGUIDE

We have presented the results of the extensive experimental investigations of the amplification and oscillation excitation by the electron beam in hybrid plasma waveguides (HPW). The structure used as HPW a coaxial line with the disk-loaded electrodes and the plasma-filled passage channel. We have examined characteristics of the oscillations excited by the beam. As the investigation of the video pulse passage through the slow-wave structure under the currents close to the start-up value indicates, the working gas pressure heightening in the bore results in extending the system transmission band because of the plasma densification. The measured microwave signal gain and beam minimum currents, to start with the value of which the amplification is possible in a beam-plasma system, are in good agreement with the corresponding parameters calculated. PACS: 52.40.Mj