Up-gradient transport in a probabilistic transport model

J. Gavnholt, J. Juul Rasmussen, O.E. Garcia, V. Naulin, A.H. Nielsen

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    Abstract

    The transport of particles or heat against the driving gradient is studied by employing a probabilistic transport model with a characteristic particle step length that depends on the local concentration or heat gradient. When this gradient is larger than a prescribed critical value, the standard deviation of the step size is large compared to its value when the gradient is below critical. For symmetric as well as asymmetric off-axis fueling, the model is capable of producing profiles peaking at the axis. Additionally, profile consistency is obtained over a broad range of source strengths. These results supplement recent works by van Milligen [Phys. Plasmas 11, 3787 (2004)], which applied Levy distributed step sizes in the case of supercritical gradients to obtain the up-gradient transport. (c) 2005 American Institute of Physics.
    Original languageEnglish
    JournalPhysics of Plasmas
    Volume12
    Issue number8
    Pages (from-to)084501
    Number of pages4
    ISSN1070-664X
    DOIs
    Publication statusPublished - 2005

    Bibliographical note

    Copyright (2005) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics

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