Theoretical interpretation of Alfven cascades in tokamaks with nonmonotonic q profiles -: art. no. 185002

Alfven spectra in a reversed-shear tokamak plasma with a population of energetic ions exhibit a quasiperiodic pattern of primarily upward frequency sweeping (Alfven cascade). Presented here is an explanation for such asymmetric sweeping behavior which involves finding a new energetic particle mode localized around the point of zero magnetic shear.