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It is shown that toroidal-magnetic-field ripple-induced particle flux can drive poloidal E×B speed to bifurcate over the local maximum of the nonlinear poloidal (or parallel) viscosity. Here, E is the electric field, and B is the magnetic field. This mechanism, together with the turbulence suppression due to the radial gradient of the E×B and diamagnetic angular velocity, is employed to explain the enhanced reversed shear mode observed in the core region of tokamaks.
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Shaing et al. (1998) studied this question.
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