title: Transport reduction by rotation shear in tokamak-edge turbulence.
abstract: Effects of externally imposed and self-generated poloidal flows on turbulent transport in the edge region of a tokamak are investigated using 3D nonlinear global simulations of resistive pressure-gradient-driven turbulence. Transport reduction is found to be due to synergetic changes in the fluctuation amplitude and in the dephasing of the fluctuations. A scaling of the fluctuation level and turbulent diffusivity with E x B flow shear strength is deduced from these simulations. These scalings agree with recent experimental observations on edge biasing as well as with analytical models.
authors.affiliation: Equipe Dynamique des Systèmes Complexes, LPIIM, UMR 6633 CNRS-Université de Provence, Centre St. Jérôme, Case 321, 13397 Marseille Cedex 20, France.
authors.forename: C F
authors.initials: CF
authors.lastname: Figarella
authors.forename: S
authors.initials: S
authors.lastname: Benkadda
authors.forename: P
authors.initials: P
authors.lastname: Beyer
authors.forename: X
authors.initials: X
authors.lastname: Garbet
authors.forename: I
authors.initials: I
authors.lastname: Voitsekhovitch