Efficiency enhancement of A 1.5-MW, 110-GHz gyrotron with a single-stage depressed collector

E. M. Choi, A. J. Cerfon, I. Mastovsky, M. A. Shapiro, J. R. Sirigiri, R. J. Temkin

Research output: Contribution to journalArticlepeer-review


We report new experimental results from a 1.5-MW, 110-GHz gyrotron with a single-stage depressed collector. The gyrotron was operated in the TE 22,6 mode with 3-μs pulse duration. An internal mode converter, which consists of a launcher and four mirrors, has been installed and tested. A highly Gaussian-like output beam was observed. A single-stage depressed collector has been operated for the study of efficiency enhancement using the same cavity V-2005 as was used in a previous experiment in the axial configuration, in which the output microwave beam propagated through a circular waveguide that also served as a collector. Output power of 1.5 MW, corresponding to 50% efficiency, was measured at 97 kV of beam voltage and 42 A of beam current at 25 kV of collector depression voltage. The results are compared between the axial configuration and the internal mode converter configuration.

Original languageEnglish (US)
Pages (from-to)334-339
Number of pages6
JournalFusion Science and Technology
Issue number2
StatePublished - Aug 2007


  • Electron cyclotron heating
  • Gyrotrons
  • High-power microwave sources

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • General Materials Science
  • Mechanical Engineering


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