Experimental study of a 1.5 MW, 110 GHz gyrotron with a single-stage depressed collector

Eunmi Choi, Antoine J. Cerfon, Ivan Mastovsky, William Mulligan, Michael A. Shapiro, Jagadishwar R. Sirigiri, Richard J. Temkin

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

Abstract

A single-stage depressed collector has been installed on a 1.5 MW, 110 GHz gyrotron and tested in 3 microsecond pulse operation at 96 kV and 40 A. The overall efficiency with the depressed collector was 50 % at 1.5 MW of output power with a voltage depression of 25 kV. Theory predicts up to 35 kV of depressed voltage for these operating conditions. The discrepancy between the experiment and the theory has been explained by the effect of an aftercavity interaction (ACI). In this paper a theoretical study using MAGY code will be compared with the experimental results. Low frequency oscillations due to reflected electrons bouncing in the adiabatic trap are identified on the 3 microsecond pulse, for accelerating voltages in the range of 45 kV to 90 kV, with observed oscillation frequencies between 100 MHz and 170 MHz. A characterization of the oscillations is performed, through the scaling of the oscillation frequency with cathode voltage and beam current. The experimental results are compared with existing theories.

Original languageEnglish (US)
Title of host publicationIRMMW-THz2007 - Conference Digest of the Joint 32nd International Conference on Infrared and Millimetre Waves, and 15th International Conference on Terahertz Electronics
Pages98-99
Number of pages2
StatePublished - Dec 1 2007
EventJoint 32nd International Conference on Infrared and Millimetre Waves, and 15th International Conference on Terahertz Electronics, IRMMW-THz2007 - Cardiff, United Kingdom
Duration: Sep 3 2007Sep 7 2007

Publication series

NameIRMMW-THz2007 - Conference Digest of the Joint 32nd International Conference on Infrared and Millimetre Waves, and 15th International Conference on Terahertz Electronics

Other

OtherJoint 32nd International Conference on Infrared and Millimetre Waves, and 15th International Conference on Terahertz Electronics, IRMMW-THz2007
CountryUnited Kingdom
CityCardiff
Period9/3/079/7/07

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Keywords

  • Depressed collectors
  • Gyrotrons
  • High power microwave sources
  • Trapped electrons

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Cite this

Choi, E., Cerfon, A. J., Mastovsky, I., Mulligan, W., Shapiro, M. A., Sirigiri, J. R., & Temkin, R. J. (2007). Experimental study of a 1.5 MW, 110 GHz gyrotron with a single-stage depressed collector. In IRMMW-THz2007 - Conference Digest of the Joint 32nd International Conference on Infrared and Millimetre Waves, and 15th International Conference on Terahertz Electronics (pp. 98-99). [4516411] (IRMMW-THz2007 - Conference Digest of the Joint 32nd International Conference on Infrared and Millimetre Waves, and 15th International Conference on Terahertz Electronics).