Current characteristics of quasi-planar vacuum diodes with explosive-emission cathodes made of various materials at a high-voltage pulse duration of a few nanoseconds

K. V. Afanas'ev, M. I. Vagner, O. P. Kutenkov, I. V. Pegel, G. A. Pribytkov, V. V. Rostov, V. P. Tarakanov

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The currents of 5-ns pulsed high-current electron beams produced in a planar vacuum diode with explosive-emission cathodes made of various materials with no external magnetic field at an average electric field strength in the gap of about 300 kV/cm have been measured and time-integrated observation of the optical luminescence of the cathode surface have been performed. Cathodes with a ceramic bushing and spring metal contacts, with ceramic plates set in a magnetic iron matrix, with blades made of stamped exfoliated graphite (Graflex), with blades made of foil fiberglass plastic, and a composite cathode made of crystalline boron and copper powders were tested. The current carried by one emission center has been estimated to range between 5 and 20 A for various cathodes. For the metal-dielectric cathode, the velocity of expansion of the cathode plasma over the ceramic surface has been estimated as 2·107 cm/s. The lifetimes of the cathodes at a pulse repetition rate of 50 Hz have been investigated.

Original languageEnglish
Pages (from-to)772-780
Number of pages9
JournalRussian Physics Journal
Volume55
Issue number7
DOIs
Publication statusPublished - 1 Dec 2012

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high voltages
pulse duration
cathodes
diodes
vacuum
ceramics
blades
bushings
pulse repetition rate
electric field strength
glass fibers
metals
high current
electric contacts
foils
boron
plastics
graphite
electron beams
luminescence

Keywords

  • cathode plasma
  • composite cathode
  • explosive emission
  • high-current nanosecond electron beam
  • metal-ceramic cathode
  • Vacuum diode

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Current characteristics of quasi-planar vacuum diodes with explosive-emission cathodes made of various materials at a high-voltage pulse duration of a few nanoseconds. / Afanas'ev, K. V.; Vagner, M. I.; Kutenkov, O. P.; Pegel, I. V.; Pribytkov, G. A.; Rostov, V. V.; Tarakanov, V. P.

In: Russian Physics Journal, Vol. 55, No. 7, 01.12.2012, p. 772-780.

Research output: Contribution to journalArticle

Afanas'ev, K. V. ; Vagner, M. I. ; Kutenkov, O. P. ; Pegel, I. V. ; Pribytkov, G. A. ; Rostov, V. V. ; Tarakanov, V. P. / Current characteristics of quasi-planar vacuum diodes with explosive-emission cathodes made of various materials at a high-voltage pulse duration of a few nanoseconds. In: Russian Physics Journal. 2012 ; Vol. 55, No. 7. pp. 772-780.
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