Kinetic simulation on ion acoustic wave in gas discharge plasma with convective scheme

Yasushi Matsunaga, Tadatsugu Hatori, Tomokazu Kato

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    Abstract

    In a one-dimensional plasma-sheath system representing a concave quasistationary electric potential typical of a negatively charged system, oscillations of ion are simulated by the aid of a convective scheme useful for weakly ionized plasma, and are theoretically investigated. The frequency spectra of the ion current through a cathode reveal to us that two modes of ion acoustic waves are dominant; a high and a low frequency mode. By deriving a linear differential equation with a dissipation and an ion flow, and taking for granted the sheath width and the distribution of ion flow velocity, the dispersion relation for a finite length system can be calculated. The simulation results, such as the reinforcement of the low frequency mode and the suppression of the high frequency mode, are satisfactorily corroborated by the linear theory. The instabilities of the waves are caused by the asymmetry of boundary conditions and by the dissipative effect.

    Original languageEnglish
    Pages (from-to)784-794
    Number of pages11
    JournalPhysics of Plasmas
    Volume7
    Issue number3
    Publication statusPublished - 2000 Mar

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    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Condensed Matter Physics

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