Electron and Ion Density Hysteresis Effects in a Low-Pressure Mercury-Vapour Plasma carrying a Current of Varying Instantaneous Value

Details Electron and Ion Density Hysteresis Effects in a Low-Pressure Mercury-Vapour Plasma carrying a Current of Varying Instantaneous Value Electron and Ion Density Hysteresis Effects in a Low-Pressure Mercury-Vapour Plasma carrying a Current of Varying Instantaneous Value

Dec 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962natur.196..979f&link_type=abstract

Nature, Volume 196, Issue 4858, pp. 979-980 (1962).

Physics

1

Scientific paper

AN experimental single-anode mercury arc valve was constructed containing a low-heat-resistance pool cathode of the molybdenum-cup type1 to anchor the cathode spot and a plasma probe inserted with its tungsten tip at the axis of the valve at a distance about one-third from anode to cathode. The valve was operated in a resistance-loaded single-phase half-wave rectifier circuit, thus carrying a half-period sinusoidal current at a frequency of 50 c/s. The cathode temperature of the valve, and hence its saturated vapour pressure, was adjusted by a control of air flow from a fan below the cathode, and the pressure was thus varied over a range of 2.5-17.5 µm mercury. The crest value of current through the valve was altered by changing the load resistance. Further on, a modified version of plasmo-graph2 was constructed to obtain on a cathode-ray tube screen a trace in semi-logarithmic form of the probe characteristic at any chosen instant of the wave-shape of the current pulses passing through the valve. Probe characteristics were obtained to construct sets of characteristics of the plasma parameters as functions of the instantaneous values of current ia for different values of load resistance at a fixed cathode temperature, and for different values of cathode temperature at a fixed value of load resistance.

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