Dust particle motion in the vicinity of dust acoustic waves
Dust particle motion in the vicinity of dust acoustic waves
复制标题
灰尘声波附近的灰尘颗粒运动
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
R. Merlino
中科院分区：
文献类型：
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作者：
E. Thomas;R. Merlino
在直流辉光放电尘埃等离子体中，尘埃声波的形成是一种常见的现象。尘埃等离子体实验装置中的实验产生自然发生的尘埃声波，其频率为f/spl sim/5至25 Hz，相速度为/spl upsi//sub ph//spl sim/0.5至10 cm/s。通过使用粒子图像测速技术，粒子运动的波阵面附近的识别和测量。粒子被证明有一个振荡行为附近的尘埃声波阵面的峰值速度/spl upsi//sub max//spl sim/4至5厘米/秒。测量是在氩直流辉光放电等离子体中进行的，压力范围从90到120毫微焦耳。本文讨论了尘埃粒子速度和尘埃粒子密度在波前附近的相关性。实验测量值进行比较，对线性化的一维模型的波。本文还简要讨论了非线性效应对尘埃声波的可能影响。
In DC glow discharge dusty plasmas, the formation of dust acoustic waves is a commonly observed phenomenon. Experiments in the dusty plasma experiment device produce naturally occurring dust acoustic waves with frequencies f/spl sim/5 to 25 Hz and phase velocities of /spl upsi//sub ph//spl sim/0.5 to 10 cm/s. Through the use of particle image velocimetry techniques, particle motion in the vicinity of the wavefronts is identified and measured. Particles are shown to have an oscillatory behavior near the dust acoustic wavefronts with peak speeds /spl upsi//sub max//spl sim/4 to 5 cm/s. Measurements are performed in argon DC glow discharge plasmas at pressures ranging from 90 to 120 mtorr. This paper discusses the correlation between the dust particle velocities and the density of dust particles in the vicinity of the wavefronts. The experimental measurements are compared against a linearized one-dimensional model for the waves. A brief discussion on the possible impact of nonlinear effects on the dust acoustic waves is also presented.