the dependence of the rootmean-square voltage on the conductive current is shown for a
pure helium plasma at 760 torr. At about 0.01 A, breakdown
occurs near 130 V. Note that this breakdown voltage is
significantly lower than that reported in Fig. 1 for a parallel-plate discharge. Above spark breakdown, the voltage changes
little with increasing current. Then at 0.5 A, the voltage
increases with current, until at 2.0 A, arcing occurs and the
voltage drops quickly. The – curve for the plasma jet
exhibits the same trends as a low-pressure DC discharge (cf.
Fig. 2), including the “normal” and “abnormal” glow regions,
and the same ranges of voltage and current (except that the
voltage values are shifted down by a factor of three or four).
the dependence of the rootmean-square voltage on the conductive current is shown for apure helium plasma at 760 torr. At about 0.01 A, breakdownoccurs near 130 V. Note that this breakdown voltage issignificantly lower than that reported in Fig. 1 for a parallel-plate discharge. Above spark breakdown, the voltage changeslittle with increasing current. Then at 0.5 A, the voltageincreases with current, until at 2.0 A, arcing occurs and thevoltage drops quickly. The – curve for the plasma jetexhibits the same trends as a low-pressure DC discharge (cf.Fig. 2), including the “normal” and “abnormal” glow regions,and the same ranges of voltage and current (except that thevoltage values are shifted down by a factor of three or four).
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