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Characteristics of Electronegative Plasma Sheath with q-Nonextensive Electron Distribution

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Abstract

The characteristics of sheath in a plasma system containing q-nonextensive electrons, cold fluid ions, and Boltzmann-distributed negative ions are investigated. A modified Bohm sheath criterion is derived by using the Sagdeev pseudopotential technique. It is found that the proposed Bohm velocity depends on the degree of nonextensivity (q), negative ion temperature to nonextensive electron temperature ratio (σ), and negative ion density (B). Using the modified Bohm sheath criterion, the sheath characteristics, such as the spatial distribution of the potential, positive ion velocity, and density profile, have been numerically investigated, which clearly shows the effect of negative ions, as well as the nonextensive distribution of electrons. It is found that, as the nonextensivity parameter and the electronegativity increases, the electrostatic sheath potential increases sharply and the sheath width decreases.

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Authors and Affiliations

  1. Department of Physics, North Eastern Regional Institute of Science and Technology, Nirjuli, India

    D. R. Borgohain & K. Saharia

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  1. D. R. Borgohain
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  2. K. Saharia
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Correspondence to K. Saharia.

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Borgohain, D.R., Saharia, K. Characteristics of Electronegative Plasma Sheath with q-Nonextensive Electron Distribution. Plasma Phys. Rep. 44, 137–144 (2018). https://doi.org/10.1134/S1063780X1801004X

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  • DOI: https://doi.org/10.1134/S1063780X1801004X

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