The results of an experimental investigation of explosive-emission plasma dynamics in an ion diode with self-magnetic insulation are presented.The investigations were accomplished at the TEMP-4M accelerator set in a mode of double pulse formation.Plasma behaviour in the anode-cathode gap was analyzed according to both the current-voltage characteristics of the diode (time resolution of 0.5 ns) and thermal imprints on a target(spatial resolution of 0.8 mm).It was shown that when plasma formation at the potential electrode was complete,and up until the second(positive) pulse,the explosive-emission plasma expanded across the anode-cathode gap with a speed of 1.3±0.2 cm/μs.After the voltage polarity at the potential electrode was reversed (second pulse),the plasma erosion in the anode-cathode gap(similar to the effect of a plasma opening switch) occurred.During the generation of an ion beam the size of the anode-cathode gap spacing was determined by the thickness of the plasma layer on the potential electrode and the layer thickness of the electrons drifting along the grounded electrode.
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