Hu Zhang-Hu, Song Yuan-Hong, Wang You-Nian
Dalian University of Technology, Dalian 116024, People's Republic of China.
Phys Rev E Stat Nonlin Soft Matter Phys. 2010 Aug;82(2 Pt 2):026404. doi: 10.1103/PhysRevE.82.026404. Epub 2010 Aug 16.
A two-dimensional particle-in-cell (PIC) model is proposed to study the wake field and stopping power induced by a nonrelativistic charged particle moving perpendicular to the external magnetic field in two-component plasmas. The effects of the magnetic field on the wake potential and the stopping due to the polarization of both the plasma ions and electrons are discussed. The velocity fields of plasma ions and electrons are investigated, respectively, in the weak and strong magnetic field cases. Our simulation results show that in the case of weak magnetic field and high ion velocity, the wakes exhibit typical V-shaped cone structures and the opening cone angles decrease with the increasing ion velocity. As the magnetic field becomes strong, the wakes lose their typical V-shaped structures and become highly asymmetrical. Similar results can be obtained in the case of low ion velocity and strong magnetic field. In addition, stopping power is calculated and compared with previous one-dimensional and full three-dimensional PIC results.
提出了一种二维粒子模拟(PIC)模型,用于研究非相对论性带电粒子在双组分等离子体中垂直于外磁场运动时所产生的尾流场和阻止本领。讨论了磁场对尾流势以及由于等离子体离子和电子极化导致的阻止作用的影响。分别在弱磁场和强磁场情况下研究了等离子体离子和电子的速度场。我们的模拟结果表明,在弱磁场和高离子速度情况下,尾流呈现出典型的V形锥结构,并且开口锥角随着离子速度的增加而减小。随着磁场变强,尾流失去其典型的V形结构并变得高度不对称。在低离子速度和强磁场情况下也能得到类似结果。此外,计算了阻止本领并与之前的一维和全三维PIC结果进行了比较。