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

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...

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Bibliographic Details
Published in:Physics of plasmas 2016-11, Vol.23 (11)
Main Authors: Terasaka, K., Hattori, M., Ogiwara, K., Yoshimura, S., Aramaki, M., Okamoto, A., Tanaka, M. Y.
Format: Article
Language:English
Subjects:
Cyclotron resonance
Depletion
Distribution functions
Electron cyclotron resonance
Flow velocity
Inhomogeneity
Laser induced fluorescence
Plasma physics
Skewed distributions
Skewness
Velocity distribution
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Summary: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.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4968217