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8 - Electron Flow in Crossed Fields

Published online by Cambridge University Press:  27 April 2018

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

Uniform electron flow in the presence of space-charge can be obtained by using static electric and magnetic fields which are perpendicular to each other and to the direction of electron motion. The electrodes providing the electric field may be parallel planes or concentric cylinders and electrons may be emitted from the whole of the surface of the negative electrode. If the magnetic field is increased from zero a magnetron diode conducts initially but becomes cut-off above a certain field strength. Theoretical steady state solutions for the electron trajectories can be found in both cases. Alternatively a sheet electron beam may be injected into the space between the electrodes. The physics of magnetron diodes has been the subject of much debate and is difficult to simulate because of the effects of secondary electron emission from the cathode caused by back-bombardment. The experimental evidence of the behaviour of cut-off magnetron diodes shows that a steady state solution does not exist. It appears that the electron cloud is subject to collective oscillations which enable electrons to reach the anode in contradiction to simple theory.

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Microwave and RF Vacuum Electronic Power Sources , pp. 287 - 316
Publisher: Cambridge University Press
Print publication year: 2018

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