Turbulent heat and particle flux response to electric field shear

A. S. Ware, P. W. Terry, B. A. Carreras, P. H. Diamond

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Turbulent heat and particle fluxes are shown to have different responses to ExB shear flow in edge plasmas. Recent work has shown that ExB shear can affect the cross phase between electrostatic potential and pressure fluctuations as well as fluctuation levels, thus affecting the heat and particle fluxes. Resistive pressure gradient driven turbulence (RPGDT) is considered including a collisional electron temperature equation. While the particle flux is sensitive to moderate amounts of shear in the radial electric field, the heat flux is insensitive to moderate shear. In the collisional regime, the difference in the sensitivity of the heat and particle fluxes to ExB shear is due to the large parallel heat conductivity. The large parallel heat conductivity dominates the temperature response to electrostatic perturbations. In lower collisionality regimes, the difference in the dissipation rates between density and temperature is negligible, but other effects can still produce different responses in the heat and particle fluxes.

    Original languageEnglish
    Pages (from-to)173-177
    Number of pages5
    JournalPhysics of Plasmas
    Volume5
    Issue number1
    DOIs
    StatePublished - Jan 1998

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