Nonlocal theory of rf suppression of current-driven ion cyclotron waves in a Q machine.

Abstract

The mode structure equation for the interacting waves, which includes the nonlinear correction terms due to ponderomotive effects, is solved using the perturbation technique. From the resultant dispersion relation, expressions for real and imaginary parts of the frequency are obtained. It is found that the lower-hybrid pump causes a downward shift in the frequency of the cyclotron wave and enhances the ion cyclotron damping, thereby stabilizing it