High-current formed ferrite plasma cathode

A new type of plasma cathode for x-ray and electron beam generation has been demonstrated using a formed ferrite plasma source where a durable filament on the ferrite rod creates a large area of plasma surface as the electron source. Measured anode voltage-current relationships show the space-charge...

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Bibliographic Details
Published in:Applied physics letters 1989-06, Vol.54 (26), p.2639-2641
Main Authors: WATANABE, K, VAN GOOR, F. A, WITTEMAN, W. J
Format: Article
Language:English
Subjects:
Electric discharges
Exact sciences and technology
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
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Summary:A new type of plasma cathode for x-ray and electron beam generation has been demonstrated using a formed ferrite plasma source where a durable filament on the ferrite rod creates a large area of plasma surface as the electron source. Measured anode voltage-current relationships show the space-charge-limited operation with a high current density of 17 A/cm2 at 70 kV anode voltage during 2.5 μs. This source is promising for high repetition rate operation with a long life.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.101021