Microwave devices with helically corrugated waveguides

V.L. Bratman, Adrian Cross, G.G. Denisov, Alan Phelps, S.V. Samsonov

Research output: Chapter in Book/Report/Conference proceedingConference contribution book


Helical corrugation of the inner surface of an oversized circular waveguide provides very flexible dispersion characteristic of an eigenwave. Under certain corrugation parameters, the eigenwave can possess a sufficiently high and almost constant group velocity over a wide frequency band in the region of close-to-zero axial wavenumber. This makes it attractive for broadband gyro-TWTs and gyro-BWOs with reduced sensitivity to electron velocity spread. Another set of parameters ensures an operating wave with a strong frequency dependant group velocity over a frequency band, which is sufficiently separated from any cutoffs. Such wave dispersion is favourable for frequency-chirped pulse compression at very high power levels. An overview of experiments on the helical-waveguide gyro-devices and the pulse compressor is presented.
Original languageEnglish
Title of host publicationQuasi-optical control of intense microwave transmission
EditorsJL Hirshfield, MI Petelin
Place of PublicationDordrecht
Number of pages9
ISBN (Print)9781402036361
Publication statusPublished - 2005
EventNATO Advanced Research Workshop on Quasi-Optical Control of Intense Microwave Transmission - Nizhny Novgorod, Russian Federation
Duration: 14 Feb 200417 Feb 2004

Publication series

NameNATO science series, series II: mathematics, physics and chemistry


ConferenceNATO Advanced Research Workshop on Quasi-Optical Control of Intense Microwave Transmission
Country/TerritoryRussian Federation
CityNizhny Novgorod


  • gyrotron-type devices
  • gyro-TWT
  • gyro-BWO
  • waveguide with helical corrugation
  • microwave pulse compression


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