Azimuthal inhomogeneity of turbulence structure and its impact on intermittent particle transport in linear magnetized plasmas

Journal Article · Sun Nov 15 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4934537· OSTI ID:22489835

Inagaki, S.; Sasaki, M.; Nagashima, Y.; Kasuya, N.; Fujisawa, A.; Itoh, S. -I. ^[1]; Kosuga, Y. ^[1]; Arakawa, H. ^[2]; Yamada, T. ^[3]; Miwa, Y. ^[4]; Itoh, K. ^[5]

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1. Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580 (Japan)
2. Teikyo University, 6-22 Misakimachi, Omuta 836-8505 (Japan)
3. Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580 (Japan)
4. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580 (Japan)
5. National Institute for Fusion Science, Toki 509-5292 (Japan)

Fluctuation component in the turbulence regime is found to be azimuthally localized at a phase of the global coherent modes in a linear magnetized plasma PANTA. Spatial distribution of squared bicoherence is given in the azimuthal cross section as an indicator of nonlinear energy transfer function from the global coherent mode to the turbulence. Squared bicoherence is strong at a phase where the turbulence amplitude is large. As a result of the turbulence localization, time evolution of radial particle flux becomes bursty. Statistical features such as skewness and kurtosis are strongly modified by the localized turbulence component, although contribution to mean particle flux profile is small.

• OSTI ID: 22489835
• Journal Information: Physics of Plasmas, Vol. 22, Issue 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CROSS SECTIONS
ENERGY TRANSFER
FLUCTUATIONS
NEUTRAL-PARTICLE TRANSPORT
NONLINEAR PROBLEMS
PLASMA
SPATIAL DISTRIBUTION
STATISTICS
TURBULENCE