Megavolt gyro-traveling-wave amplifier experiment at 35 GHz

S. H. Gold, D. A. Kirkpatrick, A. W. Fliflet, A. K. Kinkead, D. L. Hardesty, M. Sucy

Research output: Contribution to conferencePaperpeer-review


Summary form only given, as follows. An intense-beam gyro-traveling-wave amplifier (gyro-TWA) experiment has been carried out at 35 GHz, using a 1-MeV, 200-A beam from the VEBA pulseline accelerator. The experiment was carried out in a 10.8-mm-diameter drift tube and used a 6-mm-diameter solid electron beam with low initial traverse momentum and very low initial parallel velocity spread. The electron transverse momentum required by the gyro-traveling-wave interaction (β approximately 0.3-0.4) was induced by transit through a one-period untapered bifilar helical wiggler magnet with a 4-cm period. A 35-GHz signal was launched in the TE11 mode using a directional sidewall coupler. A massive iron collar (6-1/4-cm diameter, 6-cm long) was placed around the 1.27-cm outer diameter of the stainless-steel drift tube as a means to exclude the applied axial magnetic field and thus to control and vary the axial extent of the interaction. In experiments operating at 8 kG, near grazing incidence between the dispersion relations of the beam and waveguide modes, the the gyro-TWA demonstrated linear growth rates of approximately 2 dB/cm, total gain exceeding 30 dB, and an output power of ≳20 MW.

Original languageEnglish (US)
Number of pages1
StatePublished - 1990
Externally publishedYes
Event1990 IEEE International Conference on Plasma Science - Oakland, CA, USA
Duration: May 21 1990May 23 1990


Conference1990 IEEE International Conference on Plasma Science
CityOakland, CA, USA

ASJC Scopus subject areas

  • Engineering(all)


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