Investigations of Low Frequency Oscillations in a Spherical, Cold Cathode Discharge in the Presence of a Dipolar Magnetic Field

摘要

Coherent very low frequency oscillations have been experimentally investigated by means of probes. Utilizing a single probe, it is found that the maximum of the oscillations is located in the negative glow of the discharge. By means of a two-probe technique it is found that there exists a 2mπ phase shift in the angular direction with m = 0 for low discharge currents and m = 1 for high discharge currents. No radial phase shift is observed under any discharge and pressure conditions.nA simple theoretical model is developed with explains much of the experimental data. Theoretical and experimental studies are suggested which could lead to a more thorough understanding of the phenomena.