A Microwave Study of the High Pressure Arc

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Abstract
The impedance of an atmospheric pressure d.c. arc was measured at 1000 mc/sec. by means of a coaxial line and standing wave detector. The reactance and resistance of the arc, an essentially lumped load at the end of the line, increase with length of arc. The resistance decreases with increasing current and is approximately the same as the d.c. ``resistance.'' The reactance is capacitive and nearly independent of current. Air, argon, and helium were studied at currents from 1–4 amp. d.c. arc current.