Accession Number : ADP006680

Title :   Electron Emission by Nanosecond Switching in PLZT,

Corporate Author : TECHNISCHE UNIV BERLIN (GERMANY F R)

Personal Author(s) : Gundel, Hartmut

Report Date : 05 APR 1991

Pagination or Media Count : 14

Abstract : Copious electron emission from a PLZT ceramic surface takes place either when the surface is illuminated with laser pulses, or when short high-voltage pulses are applied. In the latter case, charge densities of up to 5 micron C/cm2 and current densities of some ten of amperes per square centimetre have been measured. Depending on the. position of the material in its phase diagram, different behaviour of the emission has been observed. Consequently the pulsed electron beam varies with respect to its pulse length, its amplitude, and its risetime. Further investigation of these data related to the corresponding material state might be a good diagnostic method, interesting for the switching dynamics in the ns-region. Moreover, a direct application as a pulsed Ferroelectric Electron Beam Source is envisaged, as the emission does, not rely on vacuum, but also works in low pressure gas or plasma. A maximum repetition frequency of 2 MHz has been established. An improvement of all data of the emitted electron beam seems feasible.

Descriptors :   *ELECTRON EMISSION, *ELECTRONIC SWITCHING, *FERROELECTRIC MATERIALS, AMPLITUDE, DIAGRAMS, DYNAMICS, ELECTRON BEAMS, ELECTRONS, EMISSION, FREQUENCY, HIGH VOLTAGE, LOW PRESSURE, MATERIALS, PHASE, PHASE DIAGRAMS, PRESSURE, PULSES, REGIONS, SURFACES, VACUUM, VOLTAGE, GERMANY, LEAD TITANATES, ZIRCONATES, PHOTOELECTRONS, LASER BEAMS.

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE