Asymmetry of velocity distribution function and inhomogeneity-induced flow associated with neutral depletion structure in an ECR plasma

K. Terasaka; M. Hattori; K. Ogiwara; S. Yoshimura; M. Aramaki; A. Okamoto; M. Y. Tanaka

doi:10.1063/1.4968217

Asymmetry of velocity distribution function and inhomogeneity-induced flow associated with neutral depletion structure in an ECR plasma

K. Terasaka, M. Hattori, K. Ogiwara, S. Yoshimura, M. Aramaki, A. Okamoto, M. Y. Tanaka

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

A neutral depletion structure with strong inhomogeneity in the radial direction has been observed in an electron cyclotron resonance plasma. We have measured the velocity distribution function of neutrals with a high resolution laser-induced fluorescence system and examined the relationship between asymmetry of distribution function and flow induced by inhomogeneity. It has been revealed that the third order moment of distribution function, that is, skewness, is proportional to the inhomogeneity-induced flow, and a simple relation between the skewness and the normalized flow velocity has been obtained and confirmed in the experiment.

Original language	English
Article number	112120
Journal	Physics of Plasmas
Volume	23
Issue number	11
DOIs	https://doi.org/10.1063/1.4968217
Publication status	Published - Nov 1 2016

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.4968217

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title = "Asymmetry of velocity distribution function and inhomogeneity-induced flow associated with neutral depletion structure in an ECR plasma",

abstract = "A neutral depletion structure with strong inhomogeneity in the radial direction has been observed in an electron cyclotron resonance plasma. We have measured the velocity distribution function of neutrals with a high resolution laser-induced fluorescence system and examined the relationship between asymmetry of distribution function and flow induced by inhomogeneity. It has been revealed that the third order moment of distribution function, that is, skewness, is proportional to the inhomogeneity-induced flow, and a simple relation between the skewness and the normalized flow velocity has been obtained and confirmed in the experiment.",

author = "K. Terasaka and M. Hattori and K. Ogiwara and S. Yoshimura and M. Aramaki and A. Okamoto and Tanaka, {M. Y.}",

note = "Funding Information: This work was supported by JSPS KAKENHI Grant No. 23244112, and also supported by the LHD Project Research Collaboration Program at National Institute for Fusion Science, Contract No. NIFS06KOAP016. Publisher Copyright: {\textcopyright} 2016 Author(s).",

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T1 - Asymmetry of velocity distribution function and inhomogeneity-induced flow associated with neutral depletion structure in an ECR plasma

AU - Terasaka, K.

AU - Hattori, M.

AU - Ogiwara, K.

AU - Yoshimura, S.

AU - Aramaki, M.

AU - Okamoto, A.

AU - Tanaka, M. Y.

N1 - Funding Information: This work was supported by JSPS KAKENHI Grant No. 23244112, and also supported by the LHD Project Research Collaboration Program at National Institute for Fusion Science, Contract No. NIFS06KOAP016. Publisher Copyright: © 2016 Author(s).

PY - 2016/11/1

Y1 - 2016/11/1

N2 - A neutral depletion structure with strong inhomogeneity in the radial direction has been observed in an electron cyclotron resonance plasma. We have measured the velocity distribution function of neutrals with a high resolution laser-induced fluorescence system and examined the relationship between asymmetry of distribution function and flow induced by inhomogeneity. It has been revealed that the third order moment of distribution function, that is, skewness, is proportional to the inhomogeneity-induced flow, and a simple relation between the skewness and the normalized flow velocity has been obtained and confirmed in the experiment.

AB - A neutral depletion structure with strong inhomogeneity in the radial direction has been observed in an electron cyclotron resonance plasma. We have measured the velocity distribution function of neutrals with a high resolution laser-induced fluorescence system and examined the relationship between asymmetry of distribution function and flow induced by inhomogeneity. It has been revealed that the third order moment of distribution function, that is, skewness, is proportional to the inhomogeneity-induced flow, and a simple relation between the skewness and the normalized flow velocity has been obtained and confirmed in the experiment.

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DO - 10.1063/1.4968217

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Asymmetry of velocity distribution function and inhomogeneity-induced flow associated with neutral depletion structure in an ECR plasma

Abstract

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