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    Rights statement: Copyright 2016 American Institute of Physics. The following article appeared in Physics of Plasmas, 23, 2016 and may be found at http://dx.doi.org/10.1063/1.4954651 This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

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New longitudinal mode and compression of pair ions in plasma

Research output: Contribution to journalJournal articlepeer-review

Article number062125
<mark>Journal publication date</mark>06/2016
<mark>Journal</mark>Physics of Plasmas
Issue number6
Number of pages7
Publication StatusPublished
Early online date27/06/16
<mark>Original language</mark>English


Positive and negative ions forming the so-called pair plasma differing in sign of their charge but asymmetric in mass and temperature support a new acoustic-like mode. The condition for the excitation of ion sound wave through electron beam induced Cherenkov instability is also investigated. This beam can generate a perturbation in the pair ion plasmas in the presence of electrons when there is number density, temperature, and mass difference in the two species of ions. Basic emphasis is on the focusing of ion sound waves, and we show how, in the area of localization of wave energy, the density of pair particles increases while electrons are pushed away from that region. Further, this localization of wave is dependent on the shape of the pulse. Considering the example of pancake and bullet shaped pulses, we find that only the former leads to compression of pair ions in the supersonic regime of the focusing region. Here, possible existence of regions where pure pair particles can exist may also be speculated which is not only useful from academic point of view but also to mimic the situation of plasma (electron positron asymmetric and symmetric) observed in astrophysical environment.