EFFECT OF NONLINEAR CIRCULARLY POLARIZED WAVES ON LINEAR INSTABILITIES TRIGGERED BY AN ALPHA-PARTICLE BEAM

摘要

It is shown that nonlinear left-hand polarized waves can either stabilize or destabilize linear right-hand polarized instabilities triggered by an alpha-particle beam in a magnetized electron proton plasma. The stabilization or destabilization depends upon the plasma β_i = υ_(th.i)/υ_A, where υ_(th.i) is the temperature of the 'i' plasma component, and υ_A is the Alfven velocity. It is also shown that the presence of the large amplitude wave can trigger purely electrostatic ion-acoustic instabilities. The unstable waves are supported either by the proton core or by the alpha-particle beam.