Poisoning studies of an osmium‐coated dispenser cathode
作者:
W. E. Nexsen,
W. C. Turner,
期刊:
Journal of Applied Physics
(AIP Available online 1990)
卷期:
Volume 68,
issue 1
页码: 298-303
ISSN:0021-8979
年代: 1990
DOI:10.1063/1.347132
出版商: AIP
数据来源: AIP
摘要:
The results of our studies on the reduction of the emission current from an osmium‐alloy‐coated dispenser cathode (derivative of theMcathode) due to exposure to various gases or vapors are reported. The primary interest of these studies is poisoning by chemical agents that might be encountered in the vacuum system of an induction linear accelerator. Of the constituents normally found in a tight unbaked vacuum chamber, the cathode is most sensitive to partial pressures of water vapor. Of the vapors studied which might be encountered in an induction accelerator, Freon was the most virulent poison.
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