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Electron beam generation in a diode having a ferroelectric plasma cathode controlled by optic fibers

Published online by Cambridge University Press:  05 April 2006

J. Z. Gleizer ,
K. Chirko ,
D. Yarmolich ,
S. Efimov  and
Ya. E. Krasik
J. Z. Gleizer
Affiliation:
Physics Department, Technion, 32000 Haifa, Israel
K. Chirko
Affiliation:
Physics Department, Technion, 32000 Haifa, Israel
D. Yarmolich
Affiliation:
Physics Department, Technion, 32000 Haifa, Israel
S. Efimov
Affiliation:
Physics Department, Technion, 32000 Haifa, Israel
Ya. E. Krasik*
Affiliation:
Physics Department, Technion, 32000 Haifa, Israel
*
fnkrasik@physics.technion.ac.il
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Abstract

An electron diode having a ferroelectric plasma cathode (FPS) controlled by optic fibers was operated at a repetition rate of 0.5 Hz during 1 hour, when an accelerating pulse of ~250 kV in amplitude and ~250 ns in duration is applied. The application of the fiber optic decoupling allows easy control and synchronization of the FPS operation with the firing of the HV generator. It was shown that the use of the FPS with fast fall time of the driving pulse allows reproducible generation of an electron beam having a current amplitude of ~1 kA and uniform cross-sectional current density distribution. It was shown also that in the case of the driving pulse ringing, the application of the accelerating pulse during the fall in the negative ringing leads to a plasma pre-filled mode of diode operation due to intense ion emission from the FPS. When the accelerating pulse is applied during the rise in the positive driving pulse ringing, one obtains diode operation with limited plasma emission ability. Only when the accelerating pulse is applied during the fall in the positive ringing of the driving pulse does one obtain diode operation in space-charge limited mode. This dependence of the diode operation on the timing of the accelerating pulse application with respect to the driving pulse is explained by processes related to the screening of ferroelectric bounded surface charges by the plasma charged particles.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 34 , Issue 1 , April 2006 , pp. 35 - 41
Copyright
© EDP Sciences, 2006

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