Current chopping space charge layers in a low pressure arc plasma

Computer Science – Sound

Scientific paper

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Electric Arcs, Low Pressure, Mercury Arcs, Plasma Jets, Space Charge, Argon Plasma, Gas Discharge Tubes, Magnetic Fields, Plasma Heating

Scientific paper

Chopping of the electric discharge current as occurring in the positive column of low pressure mercury arcs was investigated. Such chopping is accompanied by a rapid increase of the tube resistance. The high tube voltage drops occurring when the current is stabilized by the external circuit were found to be concentrated to a single space charge layer, which forms across the column. Simultaneously, microwave emission and fast electrons can be detected. For currents close to the instability threshold, small amplitude voltage pulses were found to propagate along the column with the ion sound speed.

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