Relative Dispersion of Trapped Ion Granulations in Sheared Flows

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Author(s)

    • KOSUGA Yusuke
    • Institute for Advanced Study, Kyushu University|Research Institute for Applied Mechanics, Kyushu University
    • ITOH Sanae-I.
    • Research Institute for Applied Mechanics, Kyushu University|Itoh Research Center for Plasma Turbulence, Kyushu University
    • ITOH Kimitaka
    • Itoh Research Center for Plasma Turbulence, Kyushu University|National Institute for Fusion Study
    • LESUR Maxime
    • Itoh Research Center for Plasma Turbulence, Kyushu University

Abstract

<p>The life time of trapped ion granulations (trapped ions correlated by resonance) in sheared flows is calculated. The dynamics of trapped ion granulations, in the presence of sheared flows, is formulated in terms of two point correlation function of phase space density fluctuations. The evolution equation is closed by a simplified closure calculation of the triplet term. Based on the closed equation, the life time of the relative dispersion of trapped ion granulations is calculated. The result shows that i.) a relevant time scale enters via a hybrid of decorrelation and shearing, (Δω<i><sub>c</sub></i><i>v'</i><i><sub>y</sub></i><sup>2</sup>)<sup>1/3 </sup>and ii.) small scale singularities in the absence of collisional dissipation enters through logarithmic divergence.</p>

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 9(0), 3403018-3403018, 2014

    The Japan Society of Plasma Science and Nuclear Fusion Research

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