Experimental studies of long-lifetime cold cathodes for high-power microwave oscillators

Aleksandr V. Gunin, Vladimir F. Landl, Sergei D. Korovin, Gennady A. Mesyats, Igor V. Pegel, Vladislav V. Rostov

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Operation of explosive-emission cold cathodes made from various materials was studied at a large number of pulses at current densities of approx. 104 A/cm2. The cathode voltage and the beam current were approx. 500 kV and 5 kA, respectively, with a pulsewidth of approx. 20 ns. At a small number of pulses (≤103), cathodes of like geometry (even made from different materials) demonstrated similar emission properties. For most of the materials tested, with a large number of pulses (≥103), the current risetime increased to the fullwidth of the voltage pulse and the maximum current of the vacuum diode decreased. When using a graphite cathode, the maximum current remained invariant until 108 pulses. Mass losses were measured for a series of cathode materials. The results obtained offered the possibility to realize long-lived operation of an X-band relativistic backward-wave oscillator with an almost invariant output power of 350-400 MW during 108 pulses at a pulse repetition rate of 100-150 p.p.s.

Original languageEnglish
Pages (from-to)537-541
Number of pages5
JournalIEEE Transactions on Plasma Science
Volume28
Issue number3
DOIs
Publication statusPublished - 1 Jun 2000
Externally publishedYes

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microwave oscillators
cold cathodes
life (durability)
pulses
cathodes
backward waves
pulse repetition rate
electric potential
beam currents
superhigh frequencies
graphite
diodes
oscillators
current density
vacuum
output
geometry

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Experimental studies of long-lifetime cold cathodes for high-power microwave oscillators. / Gunin, Aleksandr V.; Landl, Vladimir F.; Korovin, Sergei D.; Mesyats, Gennady A.; Pegel, Igor V.; Rostov, Vladislav V.

In: IEEE Transactions on Plasma Science, Vol. 28, No. 3, 01.06.2000, p. 537-541.

Research output: Contribution to journalArticle

Gunin, Aleksandr V. ; Landl, Vladimir F. ; Korovin, Sergei D. ; Mesyats, Gennady A. ; Pegel, Igor V. ; Rostov, Vladislav V. / Experimental studies of long-lifetime cold cathodes for high-power microwave oscillators. In: IEEE Transactions on Plasma Science. 2000 ; Vol. 28, No. 3. pp. 537-541.
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