Emission from ferroelectric cathodes

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

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


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 Ω, 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. The pulsed high voltage power source is capable of delivering two high voltage pulses within 50 μs of each other and is capable of operating at a sustained repetition rate of 5 Hz. 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/m2rad2. As in our previous measurements at this Laboratory, we performed the measurement using a pepper pot technique. Beamlet profiles are recorded with a fast phosphor and gated cameras. We describe our apparatus and preliminary measurements.

Original languageEnglish (US)
Pages (from-to)90-95
Number of pages6
JournalNuclear Inst. and Methods in Physics Research, A
Issue number1
StatePublished - Feb 11 1994
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics


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