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Abstract
The influence of the filament heating current on the characteristics of a cylindrical diode system has been investigated. In this structure with a radial electric field and a tangential magnetic field, produced by the heating filament current, similarly as in a magnetron geometry, an electron moves in crossed fields. It has been found that in such a structure the condition for the anode current cut-off exists although no external magnetic field is applied. The criterion for the cut-off (self-cut-off( in this structure has been calculated. The critical anode voltage is
where If is the filament heating current and li the anode radius. In the experimental part of this work the self-cut-off phenomenon has been confirmed by characteristics Ip= f(If), where Ip is the anode current, and by waveforms of the anode current.
Notes
†Communicated by Professor J. D. Craggs.