Impurity and trace tritium transport in tokamak edge turbulence

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    The turbulent transport of impurity or minority species, as for example tritium, is investigated in drift-Alfven edge turbulence. The full effects of perpendicular and parallel convection are kept for the impurity species. The impurity density develops a granular structure with steep gradients and locally exceeds its initial values due to the compressibility of the flow. An approximate decomposition of the impurity flux into a diffusive part and an effective convective part (characterized by a pinch velocity) is performed and a net inward pinch effect is recovered. The pinch velocity is explained in terms of turbulent equipartition [Nycander and Yan'kov, Phys. Plasmas 2, 2874 (1995)] and is found to vary poloidally. An approximate relationship between pinch velocity and turbulent diffusion is suggested.
    Original languageEnglish
    JournalPhysical Review E
    Issue number1
    Pages (from-to)015402
    Number of pages4
    Publication statusPublished - 2005


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