非平衡高温等离子体中温度梯度的不稳定性

本文用非平衡动力学方法研究高温等离子体中(T_i>lkev)温度梯度的不稳定性.考虑等离子体中存在电离和复合这两种互逆过程及扩散和压力不均匀引起的等离子体流动,建立密度动力学方程.给一个小密度扰动便可得出溫度梯度满足的稳定性条件.结果表明,离子温度升高时体系从稳定到不稳定交替出现,这与PLT最近的实验报道一致.

Temperature Gradient Instability in Nonequilibrium High Temperature Plasma

Temperature gradient instability in plasma density is studied by using the method of nonequilibrium dynamics. A dynamic equation of plasma density is constructed about ionization, recombination, diffusion and plasma flow which is produced by inhomogeneous pressure. From this equation, the stability condition of temperature gradient is given and it is found that the system will fluctuate alternatively from stable state to instable state as the iontemperature is raised. This conclusion is satisfactorily consistent with PLT recent observation.