Collisional effects on the oblique instability in relativistic beam-plasma interactions
Collisional effects on the oblique instability in relativistic beam-plasma interactions
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DOI：
10.1063/1.4736980
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发表时间：
2012-07
影响因子：
2.2
通讯作者：
B. Hao;W. Ding;Z. Sheng;C. Ren;X. Kong;J. Mu;Jie Zhang
中科院分区：
文献类型：
--
作者：
B. Hao;W. Ding;Z. Sheng;C. Ren;X. Kong;J. Mu;Jie Zhang
本文用变转动方法对相对论电子束在高温电阻性等离子体中的一般斜不稳定性进行了动力学研究。分析表明，静电部分的斜不稳定性衰减，并最终稳定的碰撞效应。然而，斜不稳定性（EMOI）的电磁部分被增强。由于作为EMOI的特殊情况的电流不稳定性具有较大的增长率，因此它在碰撞情况下成为主导，如我们的二维粒子模拟所示。虽然在无碰撞的情况下光束发散，但在碰撞的情况下，当初始光束扩展角小于某个幅度（例如十几度）时，由于静电不稳定性的稳定化，光束可以变得磁准直。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.4736980]
The general oblique instability for a relativistic electron beam propagating through a warm and resistive plasma is investigated fully kinetically by a variable rotation method. Analysis shows that the electrostatic part of the oblique instability is attenuated and eventually stabilized by collisional effects. However, the electromagnetic part of the oblique instability (EMOI) is enhanced. Since the current-filamentation instability as a special case of the EMOI has a larger growth rate, it becomes dominant in the collisional case as shown in our two-dimensional particle-in-cell simulations. While the beam diverges in the collisionless case, it can become magnetically collimated in the collisional case due to stabilization of the electrostatic instabilities when the initial beam spreading angle is less than certain magnitude such as a dozen degrees. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4736980]