Jiang Ke, Hou Lu-Jing, Wang You-Nian, Misković Z L
State Key Lab of Materials Modification by Beams, Department of Physics, Dalian University of Technology, Dalian, China 116023.
Phys Rev E Stat Nonlin Soft Matter Phys. 2006 Jan;73(1 Pt 2):016404. doi: 10.1103/PhysRevE.73.016404. Epub 2006 Jan 20.
We present a theoretical model for studying the interactions of charged particles with two-dimensional strongly coupled dusty plasmas, based on the quasilocalized charge approximation in which the static pair distribution function of a dust layer is determined from a molecular dynamics simulation. General expressions are derived for the perturbed dust-layer density, the induced potential in plasma, and the energy loss of a charged particle moving parallel to the dust layer. Numerical results show that the structure of Mach cones, excited in the dust layer by the charged particle, strongly depends on the plasma parameters such as the coupling parameter, the screening parameter, and the discharge pressure, as well as on the particle speed. In addition, it is found that the energy dissipation suffered by slow charged particles can be significantly enhanced in strongly coupled dusty plasmas when compared to the dissipation in weakly coupled plasmas.
我们提出了一个理论模型，用于研究带电粒子与二维强耦合尘埃等离子体的相互作用，该模型基于准局部电荷近似，其中尘埃层的静态对分布函数由分子动力学模拟确定。推导了尘埃层密度微扰、等离子体中的感应电势以及平行于尘埃层运动的带电粒子能量损失的一般表达式。数值结果表明，带电粒子在尘埃层中激发的马赫锥结构强烈依赖于等离子体参数，如耦合参数、屏蔽参数和放电压力，以及粒子速度。此外，研究发现，与弱耦合等离子体中的耗散相比，慢带电粒子在强耦合尘埃等离子体中遭受的能量耗散会显著增强。
