Transport Reduction by Rotation Shear in Tokamak-Edge Turbulence
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×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.
Bibliographic Reference: An article published in: Phys. Rev. Lett. 90, 015002 (2003)
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/doi:10.1103/PhysRevLett.90.015002
Record Number: 200719153 / Last updated on: 2007-05-21
Original language: en
Available languages: en