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。
The results show that the ion beam has an important influence upon the parametric instability excitation in plasma systems.
而较高气压时，束电子除受自身电磁场作用及库仑碰撞散射外，等离子体不稳定性使束流传输效率明显降低。
At relatively high pressure, in addition to electromagnetic field and electron's Coulomb scattering by gas molecules, plasma instability would result in decrease of propagation efficiency.
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。
It is suggested that the instability is excited in the low density plasma when the electron beam drift velocities exceed the ion acoustic speed.
设计了一个二维混合模拟程序，并用其计算了等离子体物理中的束流不稳定性。
A 2d hybrid code is designed, and in order to test it, the beam instabilities in plasma using this code is studied.
设计了一个二维混合模拟程序，并用其计算了等离子体物理中的束流不稳定性。
A 2d hybrid code is designed, and in order to test it, the beam instabilities in plasma using this code is studied.
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