Nonlinear development of the dust acoustic instability in a collisional dusty plasma
Nonlinear development of the dust acoustic instability in a collisional dusty plasma
复制标题
碰撞尘埃等离子体中尘埃声不稳定性的非线性发展
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
M. Rosenberg
中科院分区：
文献类型：
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作者：
D. Winske;M. Rosenberg
利用粒子模拟方法研究了碰撞尘埃等离子体中低频尘埃声不稳定性的非线性行为。不稳定性的产生是由于等离子体离子和中性粒子相对于带电尘埃颗粒的流动。根据线性理论，等离子体离子和中性气体背景之间的碰撞的存在降低了不稳定性的增长率。然而，非线性的漂移中性粒子的存在下，保持等离子体和尘埃离子之间的初始相对漂移，直到不稳定的波增长到大幅度和碰撞由于波粒子相互作用超过中性碰撞。因此，更强的非线性效应，表现为增强的波动，更大量的等离子体和尘埃加热，以及相对漂移速度的暂时降低，可以发生在碰撞的存在。
We study the nonlinear behavior of the low-frequency dust acoustic instability in a collisional dusty plasma by means of particle simulations. The instability arises due to the streaming of plasma ions and neutrals relative to charged dust grains. According to linear theory, the presence of collisions between the plasma ions and a neutral gas background reduces the growth rate of the instability. Nonlinearly, however, the presence of drifting neutrals maintains the initial relative drift between plasma and dust ions until the unstable waves grow to large amplitude and collisions due to wave-particle interactions exceed the neutral collisions. As a result, stronger nonlinear effects, as manifested by enhanced fluctuations, larger amounts of plasma and dust heating, and a temporary reduction of the relative drift velocity, can occur in the presence of collisions.