Emission, plasma formation, and brightness of a PZT ferroelectric cathode

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We have measured an 36-A-cm{sup {minus}2} current emission density over the surface area of an 11.4-cm{sup 2}-area Lead-Titanate- Zirconate (PZT) ferroelectric cathode with a pulsed anode-cathode (A-K) potential of 50 kV. We have also observed currents above those predicted by classical Child-Langmuir formula for a wide variety of cases. Since a plasma within the A-K gap could also lead to increase current emission we are attempting to measure the properties of the plasma near the cathode surface at emission time. In other measurements, we have observed strong gap currents in the absence of an A-K potential. Further, we continue to ... continued below

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5 p.

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Sampayan, S.; Caporaso, G.; Trimble, D. & Westenskow, G. April 27, 1995.

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We have measured an 36-A-cm{sup {minus}2} current emission density over the surface area of an 11.4-cm{sup 2}-area Lead-Titanate- Zirconate (PZT) ferroelectric cathode with a pulsed anode-cathode (A-K) potential of 50 kV. We have also observed currents above those predicted by classical Child-Langmuir formula for a wide variety of cases. Since a plasma within the A-K gap could also lead to increase current emission we are attempting to measure the properties of the plasma near the cathode surface at emission time. In other measurements, we have observed strong gap currents in the absence of an A-K potential. Further, we continue to make brightness measurements of the emitted beam and observe spatially non-uniform emission and large shot-to-shot variation. Measurements show individual beamlets with a brightness as high 10{sup 11} Am{sup {minus}2} rad{sup {minus}2}.

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5 p.

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OSTI as DE95015411

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  • 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995

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  • Other: DE95015411
  • Report No.: UCRL-JC--119409
  • Report No.: CONF-950512--264
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 95421
  • Archival Resource Key: ark:/67531/metadc793777

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  • April 27, 1995

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  • Dec. 19, 2015, 7:14 p.m.

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  • Feb. 16, 2016, 6:45 p.m.

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Sampayan, S.; Caporaso, G.; Trimble, D. & Westenskow, G. Emission, plasma formation, and brightness of a PZT ferroelectric cathode, article, April 27, 1995; California. (digital.library.unt.edu/ark:/67531/metadc793777/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.