Cesiated porous molybdenum converter for intense negative ion sources

Maintaining the proper low work function surface in steady‐state high‐current‐density negative ion sources is difficult, due to intense ion bombardment of the surface. Experiments were performed in which liquid cesium was forced through a porous molybdenum converter in order to obtain a low work fun...

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Bibliographic Details
Published in:Review of scientific instruments 1984-01, Vol.55 (1), p.8-11
Main Authors: Alessi, J. G., Hershcovitch, A., Sluyters, Th
Format: Article
Language:English
Subjects:
Charged-particle beams
Electromagnetism
electron and ion optics
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Physics
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Summary:Maintaining the proper low work function surface in steady‐state high‐current‐density negative ion sources is difficult, due to intense ion bombardment of the surface. Experiments were performed in which liquid cesium was forced through a porous molybdenum converter in order to obtain a low work function, while at the same time allowing the surface to be cooled. In a small steady‐state hollow cathode discharge source, the H− yield from a porous molybdenum converter was five fold higher than from a solid molybdenum converter which relied on the conventional method of cesium coverage by vapor deposition.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1137596