An experimental investigation of resonance and electronic oscillations in magnetrons

The paper describes an experimental investigation of the oscillations produced by magnetrons. It is shown that in all types of magnetron valves, oscillations are possible for which the ratio of the product of wavelength and anode voltage to magnetic field has a series of discrete values given by the series K : K/2: K/3 ¿ K/n in which K is a function of the anode diameter. Oscillations at frequencies corresponding to values of n up to 7 have been observed. In a full-anode magnetron all the oscillation intensities are small. For a 2-segment-anode magnetron the amplitude of the oscillation of lowest frequency (n = 1) is pronounced; in a 4-segment-anode magnetron oscillations at the frequency corresponding to n = 2 are predominant, and so on. These oscillations all belong to the class known as resonance oscillations. It is shown that there is no clear distinction between resonance and electronic oscillations at very short wavelengths, and it is suggested in the paper that they are essentially of the same nature.