Abstract
In a single-ended Q-machine the current-voltage characteristic of a small collector shows a sudden jump of the current at the onset of the electrostatic ion-cyclotron instability. This jump was also accompanied by hysteresis. This is explained as an indication that the well known nonlinear potential structures that appear periodically in front of the collector during one cycle of a high-amplitude electrostatic ion-cyclotron instability, originate from collective effects of excitation and ionization interactions produced in front of the cold plate where accelerated electrons suffer inelastic collisions with the alkaline vapour present in the plasma column.
Published Version
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