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Passage of an ion-acoustic solitary wave through the boundary between an electron-ion plasma and a negative ion plasma

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Abstract

The passage of an ion-acoustic solitary wave through the boundary between an electron-ion plasma and a negative ion plasma is considered. After the ion-acoustic solitary wave enters the region of another plasma, a disturbance arises, from which an ion-acoustic solitary wave and a chain of oscillations form over time. The amplitude of the ion-acoustic solitary wave after passage through the boundary changes in such a way that its value in the electron-ion plasma is greater than its value in the negative ion plasmas. An exception is the case of a compressive ion-acoustic solitary wave propagating through the negative ion plasma and having an amplitude exceeding the critical amplitude in the electron-ion plasma. Such an ion-acoustic solitary wave, when entering an electron-ion plasma, releases an excess of energy to accelerate positive ions and thereby reduces its amplitude below the critical value. The dependence of the amplitude of an ion-acoustic solitary wave established after the boundary crossing on its initial amplitude is determined. The passage of an ion-acoustic solitary wave through a layer of negative ion plasma surrounded by electron-ion plasmas is considered. It is shown that the passage of a rarefactive ion-acoustic solitary wave from the negative ion plasma into the electron-ion plasma causes disturbance, in which accelerated and trapped negative ions can be observed.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All data were obtained using numerical calculations and presented graphically in this article. Numerical data are available from the corresponding author on reasonable request.].

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Authors and Affiliations

  1. Joint Institute for High Temperatures, Russian Academy of Sciences, 125412, Russia, Moscow

    Yury Medvedev

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  1. Yury Medvedev
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Author performed the simulations and wrote the manuscript.

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Correspondence to Yury Medvedev.

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Medvedev, Y. Passage of an ion-acoustic solitary wave through the boundary between an electron-ion plasma and a negative ion plasma. Eur. Phys. J. D 75, 6 (2021). https://doi.org/10.1140/epjd/s10053-020-00007-1

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