Abstract
Collisionless drift-wave turbulence is studied with numerical simulations in a three-dimensional sheared slab geometry. Nonlinear electron Landau damping associated with parallel trapping is found to substantially reduce the anomalous particle transport for low magnetic shear ( $\stackrel{^}{s}<1$), whereas it plays a very weak role for higher shear ( $\stackrel{^}{s}>1$). This result has implications for the construction of transcollisional Landau-fluid models for passing electrons in the edge ( $r/a>0.8$) of a tokamak.
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