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Control of Plasma Voltage Oscillations in a Short DC Discharge with an External Auxiliary Electrode

By M. E. Koepke (a and A. S. Mustafaev (d


A dc discharge (see Fig. 1) with a hot cathode (1) and bounded by the wall (2) may be subject to current and voltage plasma oscillations, which may then have deleterious effects on its operation. These oscillations can be inhibited by installing an auxiliary electrode (4), placed outside of the anode (3). By collecting a modest current through a small opening in the anode, the discharge can be stablized. This method of supressing current oscillations can be used, for example, for high current stabilizers. Typical experimental current-voltage (I-V) characteristics of the cathode-anode gap are shown in Fig. 2 for discharges in helium. Curves 1, 2 and 3 correspond to the case without collection of the current by the auxiliary electrode. The discharge has a positive differential resistance for a pressure of 0.6 Torr (curve 1). Increasing the gas pressure to 1 Torr leads to transformation of the discharge differential resistance to being slightly negative (curve 2). Further increase of the gas pressure yield

Year: 2013
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