Jao C-S, Hau L-N
Institute of Space Science, National Central University, Jhongli, Taiwan, Republic of China.
Phys Rev E Stat Nonlin Soft Matter Phys. 2012 Nov;86(5 Pt 2):056401. doi: 10.1103/PhysRevE.86.056401. Epub 2012 Nov 1.
In an electron-proton plasma, electrostatic solitary waves and hole structures can easily be generated by streaming instability due to the asymmetric inertia between ions and electrons. It has been argued theoretically whether electrostatic solitons and/or hole structures can form in a pair plasma. This paper presents results on the formation of pair electrostatic hole structure in an electron-positron plasma based on one-dimensional electrostatic particle-in-cell simulations. In particular, we show the feature of interlacing electron and positron holes in phase space generated by current-free electron and positron beams streaming in a stationary electron-positron background plasma. The coexistent electron and positron holes are associated with periodic interlacing of positive and negative potentials, respectively. Detailed comparisons between simulation results and linear theory of streaming instability in pair plasmas are made and the thermodynamic state is inferred.
在电子 - 质子等离子体中，由于离子和电子之间的不对称惯性，通过流动不稳定性很容易产生静电孤立波和空穴结构。理论上一直存在关于在正负电子对等离子体中是否能形成静电孤子和/或空穴结构的争论。本文基于一维静电粒子模拟给出了关于正负电子对等离子体中静电空穴结构形成的结果。特别地，我们展示了在静止的正负电子背景等离子体中，由无电流的电子和正电子束流产生的相空间中电子和正电子空穴交错的特征。共存的电子和正电子空穴分别与正电位和负电位的周期性交错相关。对模拟结果与正负电子对等离子体中流动不稳定性的线性理论进行了详细比较，并推断了热力学状态。
