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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Flechtner, D. Golkowski, Cz. Kerslick, G.S. Nation, J.A. Schacter, L. |
| Copyright Year | 1996 |
| Description | Author affiliation: Sch. of Electr. Eng., Cornell Univ., Ithaca, NY, USA (Flechtner, D.) |
| Abstract | Summary form only given. The application of ferroelectric ceramics for electron beam generation is being studied at a number of research institutions and current densities /spl sim/100 A/cm/sup 2/ have been reported. Such ferroelectric materials can exhibit a spontaneous polarization, P/sub s/, of up to 100 /spl mu/C/cm/sup 2/. Emission occurs when the equilibrium state of the ferroelectric is changed rapidly by applying a pulsed electric field and a fraction of the surface screening charge is released at a gridded electrode. The majority of these studies are conducted with poled ceramics oriented such that the negative screening charge is facing the A-K gap. We report results which suggest that emission characteristics are not dependent on sample orientation. Studies conducted with a variety of gridded electrode geometries offer insights into the mechanism that initiates electron emission. Previously reported studies at Cornell showed that /spl sim/60eV electrons were observed to cross A-K gaps of /spl les/0.5 cm when the ferroelectric cathode was switched with a 200 ns pulse at voltages /spl les/2 kV. Recent measurements reveal a dramatic difference in electron energy when the polarity of the switching voltage is changed. With a 2 cm A-K gap and a +1.8 kV, 200 ns switching pulse, electron energies measure /spl sim/ 100 eV, but a switching pulse of -1.8 kV produces electrons with energies of /spl sim/600 eV. |
| File Size | 102217 |
| File Format | |
| ISBN | 0780333225 |
| ISSN | 07309244 |
| DOI | 10.1109/PLASMA.1996.550938 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1996-06-03 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Ferroelectric materials Electron emission Pulse measurements Ceramics Electrodes Voltage Energy measurement Electron beams Current density Polarization |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering |
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