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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    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
    Issue number8
    Pages (from-to)084501
    Number of pages4
    Publication statusPublished - 2005

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    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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