Ferroelectric cathode measurements

S. E. Sampayan, George J Caporaso, C. L. Holmes, E. J. Lauer, D. Prosnitz, D. O. Trimble, G. A. Westenskow

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


We have recently initiated an investigation of electron emission from ferroelectric cathodes. Our experimental apparatus consisted of an electron diode and a 250 kV, 12 ohm, 70 ns pulsed high voltage power source. A planar triode modulator driven by a synthesized waveform generator initiates the polarization inversion and allows inversion pulse tailoring. Our initial measurements indicate that emission current densities above the Child-Langmuir Space Charge Limit, JCL, are possible. We explain this effect to be based on a non-zero initial energy of the emitted electrons. We also determined that this effect is strongly coupled to relative timing between the inversion pulse and application of the main anode-cathode pulse. We also have initiated brightness measurements of the emitted beam and estimate a preliminary lower bound to be on the order of 109 A/m2-rad2 for currents close to JCL and factor of two less at currents over 4JCL. We describe our apparatus and preliminary measurements.

Original languageEnglish (US)
Title of host publicationIEEE International Pulsed Power Conference - Digest of Technical Papers
EditorsKenneth R. Prestwich, William L. Baker
Place of PublicationPiscataway, NJ, United States
Number of pages4
StatePublished - 1993
Externally publishedYes
EventProceedings of the 1993 9th IEEE International Pulsed Power Conference. Part 2 (of 2) - Albuquerque, NM, USA
Duration: Jun 21 1993Jun 23 1993


OtherProceedings of the 1993 9th IEEE International Pulsed Power Conference. Part 2 (of 2)
CityAlbuquerque, NM, USA

ASJC Scopus subject areas

  • Engineering(all)


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