Experiments have been performed on ion-sound instability produced by voltage pulses and the effects on the propagation from plasma density inhomogeneity. It is found that the amplitude of the perturbations increases away from the source, while the perturbations acquire an oscillatory structure. If the plasma density is reduced to the level at which the ionic Langmuir frequency becomes comparable with the ion-sound frequency, it is found that the ion sound is not transmitted.
Department of Electronics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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