La–Mo emitters in hollow cathodes
作者:
D. M. Goebel,
A. T. Forrester,
S. Johnston,
期刊:
Review of Scientific Instruments
(AIP Available online 1980)
卷期:
Volume 51,
issue 11
页码: 1468-1470
ISSN:0034-6748
年代: 1980
DOI:10.1063/1.1136126
出版商: AIP
数据来源: AIP
摘要:
A hollow cathode which utilizes lanthanum molybdenum (LM) as the active electron emitter is described and compared in performance to a LaB6emitter of equal area in an identical configuration. Tests in both argon and hydrogen produced effective emission current densities of up to 10 A/cm2from the LM material in continuous and long pulse operation. Examination after 40 h running time showed no sign of damage or rapid evaporation. Impurity build up on the emitting surfaces which stopped the LaB6emission after 50 h was not apparent with the LM and long lifetimes are anticipated for cathodes using this emitter.
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