Electron‐suppression experiments in a small multicusp H− source

Several techniques for suppressing the electrons before they form part of the extracted beam have been studied in a small multicusp H− source. It is found that some schemes reduce both the electron and the H− output currents. Other approaches, such as the installation of a collar at the extraction a...

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Bibliographic Details
Published in:Review of scientific instruments 1990-03, Vol.61 (3), p.1110-1116
Main Authors: Leung, K. N., Hauck, C. A., Kunkel, W. B., Walther, S. R.
Format: Article
Language:English
Subjects:
Exact sciences and technology
Magnetic confinement and equilibrium
Physics
Physics of gases, plasmas and electric discharges
Physics of plasmas and electric discharges
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Summary:Several techniques for suppressing the electrons before they form part of the extracted beam have been studied in a small multicusp H− source. It is found that some schemes reduce both the electron and the H− output currents. Other approaches, such as the installation of a collar at the extraction aperture, the addition of xenon or cesium to the hydrogen discharge, or the reduction of the source plasma potential, not only can reduce the electron current substantially, but bring about an enhancement in the extracted H− current.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1141432