Experimental determination of ion density trapped by electron beam

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Experimental determination of ion density trapped by electron beam

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© The Institution of Electrical Engineers
Published

A new probing technique has been employed to determine the ion density trapped by the potential well of an electron beam as used in microwave tubes, and unexpectedly high values of ionic charge have been found on the axis, the strong space-charge fields of which are neutralised by slow secondary electrons.

Inspec keywords: space charge; probes; stability; microwave tubes

Other keywords: space charge fields; electron beam; probing technique; slow secondary electrons; ion density; space charge; microwave tubes; instability effects

Subjects: Microwave tubes

References

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      • HASTED, J. B., and AWAD, G. L.: ‘Electron impact ionization of ions trapped in a hollow electron beam’ (to be published).
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      • L.D. Clough , K. Evans , H. Hartnagel , P.C. Kendall . Low-frequency output fluctuations of microwave tubes. Int. J. Electron. , 195 - 199
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      • H. Hartnagel . Toroidal hollow-beam gun. Proc. IEE , 1821 - 1829
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      • Hartnagel, H.: `A collision experiment with a tubular electron beam for the study of higher order ions', 5th international conference on electronic and atomic collisions, 1967, , p. 555–556, conference abstracts.
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      • H. Hartnagel . Plasma densities due to hollow electron beams. Proc. IEE , 5 , 1015 - 1017
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