Anomalous Slowing of a Perpendicularly Injected Ion Beam in Both Quasilinear and Trapping Regimes

Abstract

The anomalous slowing of an ion beam injected perpendicularly to the confining magnetic field of a low-$\ensuremath{\beta}$ plasma is experimentally verified in the nonlinear stages of the excited lower-hybrid instability. Furthermore, a transition of the main nonlinear mechanism from the quasilinear to the particle-trapping regime is demonstrated by varying beam parameters.