Turbulence Dynamics with the Coupling of Density Gradient and Parallel Velocity Gradient in the Edge Plasmas

Y. Kosuga; S. I. Itoh; K. Itoh

doi:10.1002/ctpp.201610047

Turbulence Dynamics with the Coupling of Density Gradient and Parallel Velocity Gradient in the Edge Plasmas

Y. Kosuga, S. I. Itoh, K. Itoh

Division of Nuclear Fusion Dynamics

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

3 Citations (Scopus)

Abstract

Theory of parallel shear flow driven instability (PSFI) and its impact on turbulence dynamics and transport are presented. The mode is linearly unstable when the parallel flow shear exceeds a critical value. The quasilinear particle flux contains both outward and inward components. Nonlinear dynamics is formulated in terms of hydrodynamic helicity balance. The result implies that once excited, PSFI with helicity may spread from the excited region to stable regions. Implication for turbulence in scrape off layer plasmas is discussed. (

Original language	English
Pages (from-to)	511-515
Number of pages	5
Journal	Contributions to Plasma Physics
Volume	56
Issue number	6-8
DOIs	https://doi.org/10.1002/ctpp.201610047
Publication status	Published - Aug 1 2016

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1002/ctpp.201610047

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title = "Turbulence Dynamics with the Coupling of Density Gradient and Parallel Velocity Gradient in the Edge Plasmas",

abstract = "Theory of parallel shear flow driven instability (PSFI) and its impact on turbulence dynamics and transport are presented. The mode is linearly unstable when the parallel flow shear exceeds a critical value. The quasilinear particle flux contains both outward and inward components. Nonlinear dynamics is formulated in terms of hydrodynamic helicity balance. The result implies that once excited, PSFI with helicity may spread from the excited region to stable regions. Implication for turbulence in scrape off layer plasmas is discussed. (",

author = "Y. Kosuga and Itoh, {S. I.} and K. Itoh",

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AU - Kosuga, Y.

AU - Itoh, S. I.

AU - Itoh, K.

PY - 2016/8/1

Y1 - 2016/8/1

N2 - Theory of parallel shear flow driven instability (PSFI) and its impact on turbulence dynamics and transport are presented. The mode is linearly unstable when the parallel flow shear exceeds a critical value. The quasilinear particle flux contains both outward and inward components. Nonlinear dynamics is formulated in terms of hydrodynamic helicity balance. The result implies that once excited, PSFI with helicity may spread from the excited region to stable regions. Implication for turbulence in scrape off layer plasmas is discussed. (

AB - Theory of parallel shear flow driven instability (PSFI) and its impact on turbulence dynamics and transport are presented. The mode is linearly unstable when the parallel flow shear exceeds a critical value. The quasilinear particle flux contains both outward and inward components. Nonlinear dynamics is formulated in terms of hydrodynamic helicity balance. The result implies that once excited, PSFI with helicity may spread from the excited region to stable regions. Implication for turbulence in scrape off layer plasmas is discussed. (

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Turbulence Dynamics with the Coupling of Density Gradient and Parallel Velocity Gradient in the Edge Plasmas

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