Characterisation of electron beams produced by crossed-field secondary emission diodes

Y M Saveliev, W Sibbett, D M Parkes

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The crossed-field secondary emission (CFSE) diode is a compact, simple and cheap source of tubular electron beams. The physical mechanism of current production is a self-sustained secondary electron emission, in this study, voltage-current, temporal and spatial characteristics of electron beams produced by axisymmetric and non-axisymmetric CFSE diodes have been investigated. The highest current obtained at the present stage of research is similar to 240 A generated with a diode having a cathode diameter of 64mm and operated with an applied voltage of similar to 20 kV. The electron beams are characterised by extremely high temporal stability and narrow (similar to1.4mm) radial current density distributions. In axisymmetric diodes, the azimuthal current density distribution j (phi) is uniform but this is only achieved by careful adjustment of the cathode-anode assembly. In nonaxisymmetric diodes, the j (phi) distributions are strongly non-uniform and depend not only on the magnitude but also on the direction of the magnetic field.

Original languageEnglish
Pages (from-to)940-943
Number of pages4
JournalJAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES
Volume40
Publication statusPublished - Feb 2001

Keywords

  • electron beam
  • crossed-field secondary emission electron source
  • magnetron diode
  • current density distribution
  • INSTABILITY
  • YIELD
  • GAP

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