A frequency stable vacuum-sealed tube high-power microwave vircator operated at 500 Hz

Jonathan M. Parson, Curtis F. Lynn, Mike C. Scott, Steve E. Calico, James C. Dickens, Vandreas A. Neuber, John J. Mankowski

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Operation of repetitive high-power microwave (HPM) sources is predominantly limited by thermal properties of anode and cathode materials. This letter presents a reflex-triode virtual cathode oscillator (vircator) capable of operating at 500 Hz at current densities between 100-200 A/cm2 for multiple burst durations of 1-2 s. Stable vircator operation under such a thermally punishing environment is facilitated by the use of a thin pyrolytic graphite anode. The results presented focus on two anode-cathode (A-K) gap spacings: 11 and 21 mm, which produce stable microwave radiation at 4.6 and 1.6 GHz, respectively. Characteristic voltage, current, and microwave waveforms in conjunction with short-time Fourier transforms, frequency spectrographs, and HPM power density data for 1000 and 500 pulses at 1.6 and 4.6 GHz, respectively, are presented.

Original languageEnglish
Article number7052371
Pages (from-to)508-510
Number of pages3
JournalIEEE Electron Device Letters
Volume36
Issue number5
DOIs
StatePublished - May 1 2015

Keywords

  • Anodes
  • Carbon fiber
  • Cathodes
  • Electron beam
  • High power microwave generation
  • Pyrolytic graphite
  • Vircator

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