The operation modes of a self-magnetically insulated ion diode were studied. The plasma formation at the anode surface was found to be accompanied by an electron leakage current due to the bipolar high voltage pulse. The emitting anode surface and ion beam density distribution were investigated at the ion diode output area. The characteristics of the electron leakage current are presented depending on the ion diode operation mode. The area of the emitting anode surface was approximately 25%-30% of the total anode area. The electron leakage current reaches up to 6.5 kA in the ion diode.
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