Cut-off Characteristics of a Cylindrical Magnetron †

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Abstract
The cut-off behaviour of a cylindrical magnetron is investigated experimentally, and deviation from the predictions of the Hull theory is examined as a function of the operating conditions. The anomalous anode current beyond Hull cut-off is shown to be due to cooperative space charge effects, which cause electron flow both along and at right angles to the magnetic field. The axial distribution of anode current is found to be highly non-uniform, and the anomalous current is largely incident on the anode ends. Conventional two-dimensional theories of the magnetron therefore cannot adequately describe behaviour beyond cut-off.

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