Emission properties of different cathodes at e≤105 V/cm

Ya E. Krasik, A. Dunaevsky, A. Krokhmal, J. Felsteiner, A. V. Gunin, I. V. Pegel, S. D. Korovin

Research output: Contribution to journalArticle

136 Citations (Scopus)

Abstract

We present results of the investigation of different types of cathodes operating in an electron diode powered by a high-voltage generator (300 kV, 250 ns, 84 Ω, ≤5 Hz). The cathodes which have the same emitting area of 100 cm2 are made of metal-ceramic, carbon fibers, carbon fabric, velvet, or corduroy. We also tested carbon fibers and carbon fabric cathodes coated by CsI. It was shown that for all types of cathodes the electron emission occurs from the plasma which is formed as a result of a flashover of separate emitting centers. The amount of the emitting centers and the time delay in the electron emission were found to depend strongly on the accelerating electric field growth rate. Experimental data concerning the uniformity of the light emission from the cathode surface and divergence of the generated electron beams are presented. Data related to the general parameters of the diode, namely its impedance, power, and energy are given as well. For all the cathodes investigated the observed diode impedance indicated the existence of a quasistationary cathode plasma boundary for electron current density ≤20 A/cm2. We present the dependencies of the average emitted electron current density and of the time delay in the electron emission on the number of generator shots. We also present data of the vacuum deterioration as a result of the tested cathodes operation. The obtained data are discussed within the framework of plasma formation as a result of cathode surface flashover.

Original languageEnglish
Pages (from-to)2379-2399
Number of pages21
JournalJournal of Applied Physics
Volume89
Issue number4
DOIs
Publication statusPublished - 15 Feb 2001
Externally publishedYes

Fingerprint

cathodes
electron emission
flashover
diodes
carbon fibers
time lag
impedance
current density
voltage generators
electrons
carbon
deterioration
shot
light emission
high voltages
divergence
generators
electron beams
ceramics
vacuum

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Krasik, Y. E., Dunaevsky, A., Krokhmal, A., Felsteiner, J., Gunin, A. V., Pegel, I. V., & Korovin, S. D. (2001). Emission properties of different cathodes at e≤105 V/cm. Journal of Applied Physics, 89(4), 2379-2399. https://doi.org/10.1063/1.1337924

Emission properties of different cathodes at e≤105 V/cm. / Krasik, Ya E.; Dunaevsky, A.; Krokhmal, A.; Felsteiner, J.; Gunin, A. V.; Pegel, I. V.; Korovin, S. D.

In: Journal of Applied Physics, Vol. 89, No. 4, 15.02.2001, p. 2379-2399.

Research output: Contribution to journalArticle

Krasik, YE, Dunaevsky, A, Krokhmal, A, Felsteiner, J, Gunin, AV, Pegel, IV & Korovin, SD 2001, 'Emission properties of different cathodes at e≤105 V/cm', Journal of Applied Physics, vol. 89, no. 4, pp. 2379-2399. https://doi.org/10.1063/1.1337924
Krasik YE, Dunaevsky A, Krokhmal A, Felsteiner J, Gunin AV, Pegel IV et al. Emission properties of different cathodes at e≤105 V/cm. Journal of Applied Physics. 2001 Feb 15;89(4):2379-2399. https://doi.org/10.1063/1.1337924
Krasik, Ya E. ; Dunaevsky, A. ; Krokhmal, A. ; Felsteiner, J. ; Gunin, A. V. ; Pegel, I. V. ; Korovin, S. D. / Emission properties of different cathodes at e≤105 V/cm. In: Journal of Applied Physics. 2001 ; Vol. 89, No. 4. pp. 2379-2399.
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