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arXiv 1506.08686physics.plasm-ph
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具有相似性质的三维复杂等离子体中的尘埃声波

Dust acoustic waves in three-dimensional complex plasmas with a similarity property

D. I. Zhukhovitskii

摘要:

本文研究了微重力条件下低压气体放电复杂等离子体中尘埃云体中的尘埃声波。假设复杂的等离子体符合电离状态方程(IEOS)在我们以前的研究。这个方程隐含了等离子体电离的相似性。我们发现奇异点的IEOS,确定的行为的声速在不同区域的云。利用流体方法推导了包含中性阻力项的波动方程。结果表明,声速完全由颗粒的可压缩性定义,而颗粒的可压缩性是在所用IEOS的基础上计算的。声速和阻尼率计算不同的三维复杂等离子体在交流和直流放电表现出良好的相关性与实验数据的理论的有效性范围内。该理论为观测到的声速对坐标的独立性以及对颗粒直径和气体压力的弱依赖性提供了解释。对正在进行的PK-4实验进行预测估计。

英文摘要:

Dust acoustic waves in the bulk of a dust cloud in complex plasma of low-pressure gas discharge under microgravity conditions are considered. The complex plasma is assumed to conform to the ionization equation of state (IEOS) developed in our previous study. This equation implies the ionization similarity of plasmas. We find singular points of IEOS that determine the behavior of the sound velocity in different regions of the cloud. The fluid approach is utilized to deduce the wave equation that includes the neutral drag term. It is shown that the sound velocity is fully defined by the particle compressibility, which is calculated on the basis of the used IEOS. The sound velocities and damping rates calculated for different three-dimensional complex plasmas both in ac and dc discharges demonstrate a good correlation with experimental data that are within the limits of validity of the theory. The theory provides interpretation for the observed independence of the sound velocity on the coordinate and for a weak dependence on the particle diameter and gas pressure. Predictive estimates are made for the ongoing PK-4 experiment.

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