Phys. Rev. Lett. 80, 5353–5356 (1998)Theory of Enhanced Reversed Shear Mode in TokamaksReceived 11 March 1998; published in the issue dated 15 June 1998 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. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.5353
DOI:
10.1103/PhysRevLett.80.5353
PACS:
52.55.Fa, 52.25.Fi
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