An electrostatically and a magnetically confined electron gun lens system

Focal properties, electron trajectory calculations, and geometries are given for two electron 'gun' lens systems that have a variety of applications in, for example, electron-neutral and electron-ion scattering experiments. One nine-lens system utilizes only electrostatic confinement and i...

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Bibliographic Details
Published in:Review of scientific instruments 1988-11, Vol.59 (11), p.2418-2423
Main Authors: Bernius, Mark T., Man, Kin F., Chutjian, Ara
Format: Article
Language:English
Subjects:
Atomic, molecular and charged-particle sources and detectors
Charged-particle beam sources and detectors
Electronics And Electrical Engineering
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Physics
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Summary:Focal properties, electron trajectory calculations, and geometries are given for two electron 'gun' lens systems that have a variety of applications in, for example, electron-neutral and electron-ion scattering experiments. One nine-lens system utilizes only electrostatic confinement and is capable of focusing electrons onto a fixed target with extremely small divergence angles, over a range of final energies 1-790 eV. The second gun lens system is a simpler three-lens system suitable for use in a uniform, solenoidal magnetic field. While the focusing properties of such a magnetically confined lens systenm are simpler to deal with, the system does illustrate features of electron extraction and Brillouin flow that have not been suitably emphasized in the literature.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1139920