Formation mechanisms of laboratory double layers in triple plasma devices

Physics

Scientific paper

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Plasma Drift, Plasma Electrodes, Plasma Generators, Plasma Layers, Digital Simulation, Magnetohydrodynamic Stability, Phase-Space Integral, Plasma Oscillations, Plasma Potentials, Vortices

Scientific paper

The evolution processes of double-layers have been studied in a series of laboratory experiments using a triple plasma device. It was found that the existence of virtual cathode type potential wells at the electron injection boundary was the dominant triggering mechanism. The rapid growth of the potential well led to collisionless ion trapping and the establishment of the necessary trapped ion population. For double layers with small potential drops, collisionless ion trapping actually induced ion-ion streaming instabilities and the formation of ion phase-space vortices. In this regime, the system often exhibited relaxation type oscillations which corresponded to the disruption and the recovery of the double layers.

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