The Cut-off Characteristics of Plane Magnetrons†

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Abstract
The present paper presents the cut-off characteristics of plane magnetrons obtained experimentally by applying an improved measuring method in which the effect of the ‘ marginal’ inhomogeneity of the electric field is reduced by the introduction of a guard anode. However, these characteristics are not in satisfactory agreement with the predictions of the theory which takes into account the initial velocity distribution of the electrons. It is shown that the ‘ marginal’ inhomogeneity of the electric field does not, as such, affect too much the shape of the cut-off curve; also, that a considerable number of electrons are captured by a collector, placed in the same piano as the cathode, only for positive potentials of the collector with respect to the cathode. When the collector and the cathode surfaces are at the same potential these electrons are collected by the guard-ring anode. The existence of these electrons probably accounts for the difference in shape of the cut-off curve of the central anode current of a diode with guard-ring anode and that of a conventional diode.

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