Emission properties of metal-ceramic and velvet cathodes

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

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)


We present a comparison between the parameters of a metal-ceramic cathode and the parameters of a velvet cathode which were studied at the same conditions. The cathodes had an emitting area of 100 cm 2. Experiments were performed using of PFN generator having the following output parameters: accelerating voltage of 250 keV, impedance of 80 Ω and 140 Ω, and pulse duration of 250 ns and 450 ns at FWHM. The time delay of the electron emission was measured versus the amplitude and rise time of the accelerating voltage. The uniformity of the cathode plasma formation and its expansion towards the anode was studied by a fast framing camera. The electron beam uniformity with spatial and temporal resolution and its micro-divergence was obtained using the x-ray image produced by the electron beam interaction with a Ta-made anode and by a multi pinhole camera, respectively. In addition, array of collimated Faraday cups was used to obtain electron beam uniformity. The changes of the emission properties of the metal-ceramic cathode were studied at a repetition rate of 1 Hz during 10,000 shots of the PFN operation. Compatibility of the cathodes with vacuum requirements is presented.

Original languageEnglish
Title of host publicationIEEE International Conference on Plasma Science
Number of pages1
Publication statusPublished - 2000
Externally publishedYes
EventICOPS 2000 - 27th IEEE International Conference on Plasma Science - New Orleans, LA, USA
Duration: 4 Jun 20007 Jun 2000


OtherICOPS 2000 - 27th IEEE International Conference on Plasma Science
CityNew Orleans, LA, USA

ASJC Scopus subject areas

  • Condensed Matter Physics

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