Rep-rate operation of a 300 kV, high-power microwave sealed-tube vircator

Jonathan M. Parson, Curtis F. Lynn, James William B. Bragg, Patrick Kelly, Mark Taylor, David Barnett, Shad Holt, James C. Dickens, Andreas A. Neuber, John J. Mankowski, Michael C. Scott, Steve E. Calico

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

1 Scopus citations

Abstract

Thermal limitations of anode materials are known to impose limits on rep-rate operation of cold-cathode high-power microwave (HPM) sources. This study focuses on performance of pyrolytic graphite (PG) anodes at a 500 Hz burst-mode operation in a reflex-triode virtual-cathode-oscillator (vircator). In most experiments, a 42 J, 300 kV pulse forming network (PFN) based Marx generator with an approximate pulse width of 50 ns full-width-half-max (FWHM), was utilized to drive the vircator. Rep-rated operation of the vircator exacerbates the problems already experienced in single-pulsed mode where vircators are plagued by plasma formation on the anode and cathode followed by plasma/gas expansion that causes degradation of anode materials. Hence, for frequency-stable, repetitive operation, vircators require the use of thermally robust electrode materials and ultra-clean vacuum surfaces, leading to repeatable diode operation. This contribution presents thermal modeling of anode heating and experimental electrical behavior of vircator rep-rate operation.

Original languageEnglish
Title of host publicationProceedings of the 2014 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2014
EditorsAllen L. Garner
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages326-328
Number of pages3
ISBN (Electronic)9781467373234
DOIs
StatePublished - Oct 1 2015
EventIEEE International Power Modulator and High Voltage Conference, IPMHVC 2014 - Santa Fe, United States
Duration: Jun 1 2014Jun 5 2014

Publication series

NameProceedings of the 2014 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2014

Conference

ConferenceIEEE International Power Modulator and High Voltage Conference, IPMHVC 2014
CountryUnited States
CitySanta Fe
Period06/1/1406/5/14

Keywords

  • Anodes
  • Cathodes
  • High power microwave generation
  • Thermal stability
  • Vircator

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    Parson, J. M., Lynn, C. F., Bragg, J. W. B., Kelly, P., Taylor, M., Barnett, D., Holt, S., Dickens, J. C., Neuber, A. A., Mankowski, J. J., Scott, M. C., & Calico, S. E. (2015). Rep-rate operation of a 300 kV, high-power microwave sealed-tube vircator. In A. L. Garner (Ed.), Proceedings of the 2014 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2014 (pp. 326-328). [7287274] (Proceedings of the 2014 IEEE International Power Modulator and High Voltage Conference, IPMHVC 2014). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/IPMHVC.2014.7287274