Stability of low frequency waves in H-mode plasma EDGE

In most of earlier studies of the problem of shear stabilization of drift waves, the diamagnetic drift velocity v* has been treated as a constant, which is hardly satisfied in the edge of a tokamak plasma. In configurations of this type, with a steep density gradient and radially sheared transverse velocity field, the magnetic shear stabilization criteria are severely restricted, and the velocity profile curvature v0(x) is found to play a crucial role. (author)