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Profile Effects of Plasma Rotation Velocity on Instability at Tokamak Internal Transport Barrier

The peaked profile of perpendicular/parallel plasma rotation velocity at internal transport barrier (ITB) is modelled by a Gaussian distribution. Its stabilizing or destabilizing effects on the sheared slab 4, instability arc analyzed, in the finite and weak magnetic shear regions in detail. It is found that the peaked profile of a counter-toroidal rotation at ITB contributes to the formation and maintenance of ITB in the tokamak discharges with negative magnetic shear.