On the Nature of the Voltage Fluctuations in the Plasmatron with Self-Established Arc Length

TL;DRAbstract

In a plasmatron, when the cathode is placed centrally, the channel wall serves as an anode, and length of an arc is self-established, voltage fluctuations have a specific ramp-like shape. This shape of the voltage fluctuation has the regular component generated by downstream elongation of the electric arc and its consequent rerouting and a noise generated by different processes going on inside the plasmatron 1-5. The downstream elongation of the electric arc explains the first slow stage of the voltage fluctuation. The second stage - a steep fall of the voltage - is explained by the electric breakdown between the hot arc core within the axis and the anode spot on the plasmatron channel. The "Breakdown" observed during the self-establishment of the arc length in the flow occurs mainly under the influence of dynamic interaction of electric currents of the different parts of the arc.

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