Abstract
It is shown that toroidal magnetic fleld ripple induced particle ∞ux can drive poloidal E£B speed to bifurcate over the local maximum of the nonlinear poloidal (or parallel) viscosity. Here,E is the electric fleld andB is the magnetic fleld. This mechansim, together with the turbulence suppression due to the radial gradient of the E£B and diamagnetic angular velocity, is employed to explain enhanced reversed shear mode observed in the core region of tokamaks.
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