Resonance Amplification of Ion-Acoustic Solitons in a Plasma-Beam System

The interaction of an ion-acoustic soliton with an ion beam in nonisothermal plasma is considered by using a model equation for the wave together with the path integral method for beam particles. The results show that the soliton amplitude reaches a value corresponding to the synchronism between the wave and the beam. Under some conditions, the process begins from a quasi-hydrodynamic stage which, however, is always followed by a kinetic stage associated with thfe appearance of resonance and reflected particles, the latter stage leading to much more effective amplification.