The design of a 390 GHz gyrotron based on a cusp electron gun

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

Abstract

A 390 GHz harmonic gyrotron based on a cusp electron gun was designed to operate on a TE 71 mode and the 7 th cyclotron harmonic of a large orbit electron beam. This beam is produced by a cusp electron gun with a voltage of 40 keV, a current of 1.5 A and an adjustable velocity ratio from 1 to 3. Smooth cylindrical waveguide was studied and built as the interaction cavity. The relationship between the cavity dimensions and cavity Q was optimized for output at the design mode. A simple linear output taper with moderate mode conversion was used in the gyrotron output. Both theoretical analysis and numerical simulation results (using the 3D PIC code MAGIC) of this gyrotron will be presented. When the beam thickness and beam spread were introduced into the simulation, competitive modes were observed in the simulation resulting in a drop in the output power. A high frequency (325-500 GHz) VNA was used to measure the millimeter wave properties of the gyrotron cavity and the results are presented in this paper.
Original languageEnglish
Title of host publication35th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2010)
PublisherIEEE
Number of pages2
ISBN (Print)9781424466559
DOIs
Publication statusPublished - 28 Oct 2010
Event35th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2010) - Rome, Italy
Duration: 5 Sep 201010 Sep 2010

Conference

Conference35th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2010)
CountryItaly
CityRome
Period5/09/1010/09/10

Keywords

  • cavity resonators
  • electron beams
  • helium
  • power generation
  • harmonic analysis
  • gyrotrons
  • terahertz wave detectors

Cite this

Li, F., He, W., Phelps, A. D. R., Donaldson, C. R., Zhang, L., Cross, A. W., & Ronald, K. (2010). The design of a 390 GHz gyrotron based on a cusp electron gun. In 35th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2010) IEEE. https://doi.org/10.1109/ICIMW.2010.5612375