DocumentCode :
1950686
Title :
50 Hz electron emission from PZT ferro-electric cathodes
Author :
Flechtner, D. ; Golkowski, Czeslaw ; Ivers, J.D. ; Kerslick, G.S. ; Nation, J.A. ; Schachter, Levi
Author_Institution :
Cornell Univ., Ithaca, NY, USA
fYear :
1997
fDate :
19-22 May 1997
Firstpage :
330
Abstract :
Summary form only given, as follows. Ferro-electric cathodes may offer a source of high current density electron beams for applications where the use of conventional field emitters is limited by repetition rate and lifetime. In a ferro-electric cathode, electrons are emitted when the spontaneous polarization is rapidly changed by a pulsed electric field applied across the ferroelectric. When no additional voltage is applied to a planar diode gap, emission current densities are on the order of 1 A/cm/sup 2/. When an additional field is applied to the gap, we have measured current densities up to 100 A/cm/sup 2/. In a new configuration that permits beam extraction into a drift tube, the cathode is pulsed 10-20 kV negative and electron current densities of /spl sim/20 A/cm/sup 2/ at repetition rates up to /spl sim/50 Hz (power supply limited) have been measured. The one inch diameter ferro-electric cathode is located in the fringing region of a 1.5 kG solenoid magnetic field /spl sim/2.8 cm from the entrance of a grounded drift tube. A Faraday cup is located several centimeters inside the drift tube and measurements show that repeatable beam current can be extracted from the ferroelectric cathode in this geometry.
Keywords :
cathodes; current density; electron beams; electron field emission; ferroelectric materials; lead compounds; particle beam extraction; piezoceramics; 1.5 kG; 10 to 20 kV; 50 Hz; Faraday cup; PZT; PZT ferro-electric cathodes; PbZrO3TiO3; beam current; beam extraction; drift tube; electron current densities; electron emission; emission current densities; field emitters; grounded drift tube; high current density electron beams source; planar diode gap; pulsed electric field; repetition rate; solenoid magnetic field; spontaneous polarization; Cathodes; Current density; Current measurement; Density measurement; Electron beams; Electron emission; Ferroelectric materials; Magnetic field measurement; Pulse measurements; Pulsed power supplies;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Plasma Science, 1997. IEEE Conference Record - Abstracts., 1997 IEEE International Conference on
Conference_Location :
San Diego, CA, USA
ISSN :
0730-9244
Print_ISBN :
0-7803-3990-8
Type :
conf
DOI :
10.1109/PLASMA.1997.605238
Filename :
605238
Link To Document :
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