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This paper reports the experimental results from the appearance of three discharge modes in a special geometry as a function of applied negative voltage pulses. The geometry is a four-gap pseudospark one with a gap distance of 4 mm, a metallic hollow cathode, and an anode. The applied pulsed voltage $U_{p}$ varies from −20 to −80 kV. The pulse shape is a rectangular one with a pulsewidth of 50 ns...
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