Novel cathode for field‐emission applications
作者:
Eusebio Garate,
Roger D. McWilliams,
Donald E. Voss,
Alexander L. Lovesee,
Kyle J. Hendricks,
Thomas A. Spencer,
M. Collins Clark,
Amnon Fisher,
期刊:
Review of Scientific Instruments
(AIP Available online 1995)
卷期:
Volume 66,
issue 3
页码: 2528-2532
ISSN:0034-6748
年代: 1995
DOI:10.1063/1.1146504
出版商: AIP
数据来源: AIP
摘要:
A CsI salt‐based cathode which is capable of producing a modest perveance, 10 s of A/cm2electron beam for several microseconds pulse lengths, and has little susceptibility to diode closure has been experimentally characterized. This explosive field‐emission CsI‐coated carbon fiber cathode has operated in modest 10−5Torr vacuums at voltages up to 160 kV, and can easily be configured to provide space‐charge‐limited solid or annular electron beams in arbitrarily large diameter configurations. The CsI cathode has demonstrated negligible closure for 2 &mgr;s pulses, and has operated for 200 shots with no degradation in cathode performance. Data on the operating performance of this salt cathode, including effective gap time history and streak photographs demonstrating uniformity of the current density, are presented. A comparison of CsI cathode performance with a velvet explosive field emitting cathode used in electron‐beam production is also presented. ©1995 American Institute of Physics.
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