论文标题
在不均匀的灰尘等离子体中激发尘埃声冲击波
Excitation of dust acoustic shock waves in an inhomogeneous dusty plasma
论文作者
论文摘要
在灰尘等离子体实验（DPEX）设备中对冲击波的传播特性进行了一次实验研究。由多分散性高岭土颗粒组成的均质尘土等血浆最初是通过保持泵送速度和气体进料速率的动态平衡来形成的。后来，通过在原始动态平衡中引入不平衡而产生灰尘流体中的平衡密度不均匀性。然后，通过灰尘流体突然压缩，在这种不均匀的灰尘等离子体中激发了非线性波结构。这些结构被识别为冲击波，其幅度和宽度轮廓是空间测量的。看到冲击结构的幅度增加，而宽度随着尘埃密度降低的趋势而扩大。得出了修改的kDV燃烧方程，并用于提供对结果的理论解释，包括振幅和宽度变化的功率定律比例作为背景密度的函数。
An experimental investigation of the propagation characteristics of shock waves in an inhomogeneous dusty plasma is carried out in the Dusty Plasma Experimental (DPEx) device. A homogeneous dusty plasma, made up of poly-dispersive kaolin particles, is initially formed in a DC glow discharge Argon plasma by maintaining a dynamic equilibrium of the pumping speed and the gas feeding rate. Later, an equilibrium density inhomogeneity in the dust fluid is created by introducing an imbalance in the original dynamic equilibrium. Non-linear wave structures are then excited in this inhomogeneous dusty plasma by a sudden compression in the dust fluid. These structures are identified as shock waves and their amplitude and width profiles are measured spatially. The amplitude of a shock structure is seen to increase whereas the width broadens as it propagates down a decreasing dust density profile. A modified-KdV-Burger equation is derived and used to provide a theoretical explanation of the results including the power law scaling of the changes in the amplitude and width as a function of the background density.
