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10 - Electron Collectors and Cooling

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.
Type
Chapter
Information
Microwave and RF Vacuum Electronic Power Sources , pp. 352 - 374
Publisher: Cambridge University Press
Print publication year: 2018

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