Reflection of modified Korteweg–de Vries solitons from the sheath in front of a negatively biased metal disk is experimentally investigated in a negative ion plasma. Both rarefactive and compressive solitons are reflected and the polarity of the reflected solitons is the same as that of the incident solitons. The points of reflection for the rarefactive and compressive solitons are at different locations. As the magnitude of the negative bias potential that is applied to the reflector is increased, the two reflection points move away from the reflector. An interpretation in terms of the sheath characteristics is presented.

Simple optics description of the plasma sheath and plasma electrode region AIP Conf.The spatial and temporal evolution of the components of a plasma surrounding a 90°convex and a 90°concave electrode whose potential is suddenly decreased in a three-component plasma is numerically investigated. The quasineutral plasma consists of positive ions and various proportions of negative ions and electrons. The results are compared and contrasted with those that are obtained in a normal two-component plasma. The transient or ion matrix sheath is identified and its subsequent evolution is investigated. Effects of perturbations in the electrode are investigated.

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The expansion of a plasma consisting of positive ions, negative ions, and electrons into a vacuum is solved numerically. In addition to the expected self-similar expansion found in a quasineutral plasma expansion model, a burst of positive ions is accelerated into the vacuum and a burst of negative ions is accelerated into the plasma. These accelerated ions arise since quasineutrality is not imposed in the simulation.