RF stabilization of ballooning modes in an axisymmetrically rotating plasma

It is known that ponderomotive forces produced by radial gradients in the RF energy can provide an effective stabilizing mechanism and create a stable window to the second stability regime. This problem is reexamined here with the introduction of axisymmetric toroidal rotation which itself is believed to have stabilizing influence on the ballooning modes on most flux surfaces except in the outer region. It is shown that the stabilizing effect is additive and an additional and important observation is that the outer region of the flux surfaces also gets stabilized by RF waves. (orig.)