Eur. Phys. J. Appl. Phys.
Volume 34, Number 1, April 2006
|Page(s)||35 - 41|
|Section||Plasma, Discharge and Processes|
|Published online||05 April 2006|
Electron beam generation in a diode having a ferroelectric plasma cathode controlled by optic fibers
Physics Department, Technion, 32000 Haifa, Israel
Corresponding author: email@example.com
Revised: 25 November 2005
Accepted: 3 January 2006
Published online: 5 April 2006
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.
PACS: 41.75.-i – Charged-particle beams / 52.50.Dg – Plasma sources / 52.77.-j – High-pressure, high-current plasmas
© EDP Sciences, 2006
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