Exploration of spontaneous vortex formation and intermittent behavior in ECR plasmas

The HYPER-I experiments

S. Yoshimura, Kenichiro Terasaka, E. Tanaka, M. Aramaki, A. Okamoto, K. Nagaoka, Masayoshi Tanaka

    研究成果: ジャーナルへの寄稿記事

    2 引用 (Scopus)

    抄録

    HYPER-I (High Density Plasma Experiment-I) is a linear device that combines a wide operation range of plasma production with flexible diagnostics. The plasmas are produced by the electron cyclotron resonance (ECR) heating with parallel injection of right-handed circularly polarized microwaves of 2.45 GHz from the high-field side. The maximum attainable electron density is more than two orders of magnitude higher than the cutoff density of ordinary waves. Spontaneous formation of a variety of large-scale flow structures, or vortices, has been observed in the HYPER-I plasmas. Flow-velocity field measurements using directional Langmuir probes (DLPs) and laser-induced fluorescence (LIF) method have clarified the physical processes behind such vortex formations. Recently, a new intermittent behavior of local electron temperature has also been observed. Statistical analysis of the floating potential changes has revealed that the phenomenon is characterized by a stationary Poisson process.

    元の言語英語
    記事番号00114
    ジャーナルJournal of Plasma Physics
    81
    発行部数2
    DOI
    出版物ステータス出版済み - 1 1 2015

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    electron cyclotron resonance
    plasma density
    vortices
    poisson process
    electrostatic probes
    statistical analysis
    laser induced fluorescence
    floating
    cut-off
    flow velocity
    velocity distribution
    electron energy
    injection
    microwaves
    heating

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics

    これを引用

    Exploration of spontaneous vortex formation and intermittent behavior in ECR plasmas : The HYPER-I experiments. / Yoshimura, S.; Terasaka, Kenichiro; Tanaka, E.; Aramaki, M.; Okamoto, A.; Nagaoka, K.; Tanaka, Masayoshi.

    :: Journal of Plasma Physics, 巻 81, 番号 2, 00114, 01.01.2015.

    研究成果: ジャーナルへの寄稿記事

    Yoshimura, S. ; Terasaka, Kenichiro ; Tanaka, E. ; Aramaki, M. ; Okamoto, A. ; Nagaoka, K. ; Tanaka, Masayoshi. / Exploration of spontaneous vortex formation and intermittent behavior in ECR plasmas : The HYPER-I experiments. :: Journal of Plasma Physics. 2015 ; 巻 81, 番号 2.
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    abstract = "HYPER-I (High Density Plasma Experiment-I) is a linear device that combines a wide operation range of plasma production with flexible diagnostics. The plasmas are produced by the electron cyclotron resonance (ECR) heating with parallel injection of right-handed circularly polarized microwaves of 2.45 GHz from the high-field side. The maximum attainable electron density is more than two orders of magnitude higher than the cutoff density of ordinary waves. Spontaneous formation of a variety of large-scale flow structures, or vortices, has been observed in the HYPER-I plasmas. Flow-velocity field measurements using directional Langmuir probes (DLPs) and laser-induced fluorescence (LIF) method have clarified the physical processes behind such vortex formations. Recently, a new intermittent behavior of local electron temperature has also been observed. Statistical analysis of the floating potential changes has revealed that the phenomenon is characterized by a stationary Poisson process.",
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    AU - Terasaka, Kenichiro

    AU - Tanaka, E.

    AU - Aramaki, M.

    AU - Okamoto, A.

    AU - Nagaoka, K.

    AU - Tanaka, Masayoshi

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