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Proceedings Paper

Physics of electron emission from ferroelectric cathodes
Author(s): Gennady A. Mesyats
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Paper Abstract

In the recent years a number of publications on the electron emission from ferroelectric cathodes have appeared. The most recent reviews are those by Schachter et a!) and by Gundel.2 Ferrodielectrics are ceramics containing the compounds PbZrO3, LaO3, and PbTiO3. These ceramics are designated PLZT by the initial letters symbolising the metals involved. A cathode of this type is simple in construction. This is a PLZT ceramic plate of several milimeters in thickness with a solid silver layer fused into the plate from one side (a trigger electrode, TE). From the other side the plate is covered with a large number of silver strips parallel each other (a grid). The silver layer thickness is 1 m on both sides. The anode to which an acceleration voltage is applied is placed parallel to the grid. The grid is grounded. An up to 2 kV trigger pulse of duration iO s is applied to the TE. In the cathode-anode vacuum gap of the diode an electron current appears which is a hundred or more times higher than the Child-Langmuir current and shows a pronounced threshold depenthng on the voltage applied to the ceramics. Early in the pulse the electron current increases almost linearly with time; An investigation into the current structure has shown that it consists of individual bursts that merge into a single flow.2

Paper Details

Date Published: 1 May 1994
PDF: 4 pages
Proc. SPIE 2259, XVI International Symposium on Discharges and Electrical Insulation in Vacuum, (1 May 1994); doi: 10.1117/12.174549
Show Author Affiliations
Gennady A. Mesyats, Institute of Electrophysics (Russia)

Published in SPIE Proceedings Vol. 2259:
XVI International Symposium on Discharges and Electrical Insulation in Vacuum
Gennady A. Mesyats, Editor(s)

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