A versatile test rig for the evaluation of thermionic electron guns

H. Ahmed, C. J.D. Catto, J. R.A. Cleaver, P. L. Kanitkar, D. J. Smith

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Measurements of the brightness and the electron energy distribution for high-performance electron guns for electron-optical instruments must take account of the small effective size of the electron source and the directional dependence of the emission from it. A versatile electron gun test rig has been developed to enable measurements to be made under realistic operating conditions. Energy distribution can be determined with a hemispherical cup retarding-field analyser, and brightness can be measured at up to 100 kV by both two-aperture and crossover-projection methods. Some measured characteristics of lanthanum hexaboride cathodes are given, with measurements of conventional tungsten cathodes for comparison.

Original languageEnglish (US)
Article number020
Pages (from-to)1351-1355
Number of pages5
JournalJournal of Physics E: Scientific Instruments
Issue number12
StatePublished - Dec 1 1982
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation
  • General Materials Science
  • General Engineering
  • General Physics and Astronomy


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