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The enhanced decorrelation of fluctuations by the combined effects of the E×B flow (VE) shear, the parallel flow (V∥) shear, and the magnetic shear is studied in toroidal geometry. A two-point nonlinear analysis previously utilized in a cylindrical model Phys. Fluids B 2, 1 (1990) shows that the reduction of the radial correlation length below its ambient turbulence value (Δr0) is characterized by the ratio between the shearing rate ωs and the ambient turbulence scattering rate ΔωT. The derived shearing rate is given by ω2s= (Δr0) 2 (1/Δφ2) (∂/∂r) (qVE/r) 2 + (1/Δη2) (∂/∂r) (V∥/qR) 2, where Δφ and Δη are the correlation angles of the ambient turbulence along the toroidal and parallel directions. This result deviates significantly from the cylindrical result for high magnetic shear or for ballooning-like fluctuations. For suppression of flute-like fluctuations, only the radial shear of qVE/r contributes, and the radial shear of V∥/qR is irrelevant regardless of the plasma rotation direction.
T. S. Hahm (Thu,) studied this question.
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