等离子体中离子声波的色散关系

Dispersion relation for ion-acoustic waves in plasma

以含有满足玻耳兹曼分布的低温电子、远离平衡态的高温电子和离子组成的等离子体为研究对象,推导得到在该等离子体中传播的离子声波的色散关系.利用数值模拟方法讨论系统参数如快电子数、两种电子温度之比和数密度比值对离子声波的色散关系的影响.结果表明:系统参数的变化均会影响和改变着系统的色散关系,其中ω2随快电子数α的增大而增大.

A plasma which consisted of lower temperature Boltzmann distributed electrons, higher temperature non-thermal distributed electrons and ions was studied and the dispersion relation of ionacoustic waves was obtained in this paper. The effects and influences of system parameters, such as the fast electrons number, the ratio of the two electrons temperatures, and the ratio of the two electrons densities on the dispersion relation of the ion-acoustic waves were analyzed carefully by using numerical simulation method. The results showed that variation of the plasma parameters has an important influence on the dispersion relation of this system. In addition, o92 increase with the increase of the fast electrons number a.