Characteristics of diode perveance and vircator output under various anode-cathode gap distances

When an electron beam is generated from a cathode, an electrode sheath plasma is also generated. Hence, the perveance of the diode is varied and changes the diode output characteristics. In our pulsed-power system "Chundoong," the perveance characteristics have been experimentally investig...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2002-10, Vol.30 (5), p.1728-1732
Main Authors: Eun Ha Choi, Choi, Myung Chull, Choi, Sung Hyuk, Kie Back Song
Format: Article
Language:English
Subjects:
Anodes
Cathodes
CRTs
Current density
Diodes
Electrodes
Electron beams
Microwaves
Output
Perveance
Plasma
Plasma measurements
Plasma properties
Plasma sheaths
Pulse measurements
Sheaths
Velocity measurement
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Summary:When an electron beam is generated from a cathode, an electrode sheath plasma is also generated. Hence, the perveance of the diode is varied and changes the diode output characteristics. In our pulsed-power system "Chundoong," the perveance characteristics have been experimentally investigated, from which the sheath-plasma expansion speed has been measured to be about 3 cm//spl mu/s inside the diode. It is shown that the sheath-plasma expansion inside the diode gives the influence on the electron-beam current density. The vircator microwave output has been shown to be sensitively dependent on the anode-cathode (A-K) gap distance. The highest microwave power occurs at the initial A-K gap distance d=4 mm with peak power of 200 MW and a frequency of about 5.5 GHz in this experiment.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2002.806615