It is suggested that the instability is excited in the low density plasma when the electron beam drift velocities exceed the ion acoustic speed.
不稳定性产生的可能机制是由于电子束穿过低密度本底等离子体的漂移速度超过离子声速而激发起来的。
2
The results show that the ionbeam has an important influence upon the parametric instability excitation in plasma systems.
结果表明：离子束对等离子体中参量不稳定性的激发有极重要的影响。
3
The results show that electromagnetic instability can be excited in an ion-beam-plasma system. Ion-electron collisions increase the growth rate of the instability.