Kinetic Simulation of an Ion Acoustic Wave with Charge Exchange Process in Direct Current Discharge Plasma

Yasushi Matsunaga, Tadatsugu Hatori, Tomokazu Kato

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    A charge exchange model is set and its simulation results are compared to those of previous friction model in the lower current branch of a discharge plasma. A remarkable delocalization of a high frequency mode is found in the charge exchange model. When the mean free path of the charge exchange is larger than the system size, the effective temperature is lower than that of the friction model. However, with a decrease of the mean free path, the temperatures of the two models are inverted. Although the bifurcations of the fundamental mode described in previous paper are similarly reproduced, a parameter range has shifted and it is difficult to observe the ponderomotive effect in the charge exchange model. Simulation results are discussed from the view point of the second moments of the distribution function in both velocity and coordinate spaces. It is found that the effects due to the ponderomotive force and previously pointed-out sheath condition are concealed under the diffusion defined by the second moment of the displacement of scattered particles.

    Original languageEnglish
    Pages (from-to)2445-2455
    Number of pages11
    JournalJournal of the Physical Society of Japan
    Volume71
    Issue number10
    DOIs
    Publication statusPublished - 2002 Oct

    Fingerprint

    ion acoustic waves
    charge exchange
    plasma jets
    direct current
    kinetics
    simulation
    mean free path
    friction
    moments
    ponderomotive forces
    low currents
    sheaths
    distribution functions

    Keywords

    • Bifurcations
    • Charge exchange
    • Ion acoustic wave
    • Ponderomotive force

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Kinetic Simulation of an Ion Acoustic Wave with Charge Exchange Process in Direct Current Discharge Plasma. / Matsunaga, Yasushi; Hatori, Tadatsugu; Kato, Tomokazu.

    In: Journal of the Physical Society of Japan, Vol. 71, No. 10, 10.2002, p. 2445-2455.

    Research output: Contribution to journalArticle

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    AB - A charge exchange model is set and its simulation results are compared to those of previous friction model in the lower current branch of a discharge plasma. A remarkable delocalization of a high frequency mode is found in the charge exchange model. When the mean free path of the charge exchange is larger than the system size, the effective temperature is lower than that of the friction model. However, with a decrease of the mean free path, the temperatures of the two models are inverted. Although the bifurcations of the fundamental mode described in previous paper are similarly reproduced, a parameter range has shifted and it is difficult to observe the ponderomotive effect in the charge exchange model. Simulation results are discussed from the view point of the second moments of the distribution function in both velocity and coordinate spaces. It is found that the effects due to the ponderomotive force and previously pointed-out sheath condition are concealed under the diffusion defined by the second moment of the displacement of scattered particles.

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