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9 - Electron Guns

Published online by Cambridge University Press:  27 April 2018

Richard G. Carter
Richard G. Carter
Affiliation:
Lancaster University
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Summary

A linear electron beam is formed by an electron gun which is a diode in which the electrons pass through an aperture in the anode without interception. The Pierce gun for generating a cylindrical beam is based on a spherical space-charge limited diode. A non-emitting focusing electrode, which is a continuation of the cathode, and the anode nose are so shaped that the electrons flow in a convergent cone. The angle of convergence is reduced by the lens action of the anode aperture and by space-charge forces. The design of Pierce guns is discussed in detail including the effects of thermal velocities and the shaping of the magnetic field as the beam enters a magnetic focusing system. Pierce guns can also be designed for hollow beams and sheet beams. The current in the beam can be controlled by a grid or a modulating anode. In a Kino gun a planar, cut-off, magnetron diode is used for injecting a sheet beam into a crossed-field focusing system. The magnetron injection gun, based on a cut-off magnetron diode in which the cathode is a truncated cone, forms a hollow electron beam in the axial direction for injection into a longitudinal magnetic field.

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Microwave and RF Vacuum Electronic Power Sources , pp. 317 - 351
Publisher: Cambridge University Press
Print publication year: 2018

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  • Electron Guns
  • Richard G. Carter, Lancaster University
  • Book: Microwave and RF Vacuum Electronic Power Sources
  • Online publication: 27 April 2018
  • Chapter DOI: https://doi.org/10.1017/9780511979231.010
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  • Electron Guns
  • Richard G. Carter, Lancaster University
  • Book: Microwave and RF Vacuum Electronic Power Sources
  • Online publication: 27 April 2018
  • Chapter DOI: https://doi.org/10.1017/9780511979231.010
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Electron Guns
  • Richard G. Carter, Lancaster University
  • Book: Microwave and RF Vacuum Electronic Power Sources
  • Online publication: 27 April 2018
  • Chapter DOI: https://doi.org/10.1017/9780511979231.010
Available formats
×