Observation of screening effect in large-area, cold-cathode diodes

In this work we report the first observation of the screening effect in large-area, cold-cathode diodes. A framing camera was used to observe the formation of emission centers (ECs) on a 200 cm2 velvet emitter. The density of ECs increased as a function of applied magnetic field as predicted. The cu...

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Bibliographic Details
Published in:Applied physics letters 1992-04, Vol.60 (17), p.2062-2064
Main Authors: Coogan, J. J., Rose, E. A.
Format: Article
Language:English
Subjects:
426002 - Engineering- Lasers & Masers- (1990-)
BEAMS
COLD CATHODE TUBES
DISTRIBUTION
DYNAMICS
ELECTRON BEAMS
ELECTRON EMISSION
ELECTRON TUBES
EMISSION
ENGINEERING
EXCIMER LASERS
GAS LASERS
LASERS
LEPTON BEAMS
MAGNETIC FIELDS
MECHANICS
PARTICLE BEAMS
PLASMA DIAGNOSTICS
PLASMA PRODUCTION
PLASMA SHEATH
SCREENING
SPATIAL DISTRIBUTION
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Summary:In this work we report the first observation of the screening effect in large-area, cold-cathode diodes. A framing camera was used to observe the formation of emission centers (ECs) on a 200 cm2 velvet emitter. The density of ECs increased as a function of applied magnetic field as predicted. The current per EC decreased as the magnetic field was increased. These phenomena suggest methods of increasing the spatial and temporal uniformity of high-power electron beams.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.107439