Abstract
An electromagnetic hybrid model of drift-kinetic electrons and cold ions in three-dimensional sheared slab geometry is constructed to treat collisionless drift Alfvén turbulence in tokamak edge plasmas. The basic nonlinear equations are solved numerically using explicit finite-difference methods on a phase-space grid rather than an ensemble of “superparticles.” Basic properties of the turbulent fluctuations such as amplitude and phase distributions, amplitude correlations, and energy spectra are investigated. The resulting turbulent particle transport by magnetic flutter is negligible compared to that by E×B convection. However, the intrinsic dynamics of the turbulence remains electromagnetic due to the influence of kinetic shear Alfvén waves and magnetic flutter. Comparisons with a companion Landau-fluid model are more successful than in similar studies of ion temperature gradient turbulence.
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