Magnetic Field Generation during the Collision of Electron-Ion Plasma Clouds
Magnetic Field Generation during the Collision of Electron-Ion Plasma Clouds
复制标题
电子-离子等离子体云碰撞过程中磁场的产生
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
S. V. Bulanov
中科院分区：
文献类型：
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作者：
Y. Kazimura;F. Califano;J. Sakai;T. Neubert;F. Pegoraro;S. V. Bulanov
我们给出了用二维3V格子粒子程序和二维双流体无碰撞相对论程序对电子-离子等离子体云碰撞的分析研究和计算机模拟结果。我们讨论了准静态磁场的产生问题。利用两个对流电子布居的相对论双流体方程，借助于线性理论，我们证明了磁场的产生与“电磁对流不稳定性”有关。二维(2D)胞内粒子与线性理论的结果符合得很好。我们发现，准静态磁场经历了结构的无碰撞变化，导致了大规模、长寿命的结构。这些过程对于理解激光等离子体和空间等离子体中两个恒星风碰撞区域的磁场产生可能很重要。
We present the results of analytical studies and computer simulations of electron-ion plasma cloud collisions using 2D3V particle-in-cell and 2D two-fluid collisionless relativistic codes. We address the problem concerning the generation of a quasistatic magnetic field. Using relativistic two-fluid equations for the two counterstreaming electron populations, we show with the help of linear theory that the generation of a magnetic field can be associated with the “electromagnetic counterstreaming instability”. Two-dimensional (2D) particle-in-cell provide good agreement with the results of linear theory. We show that the quasistatic magnetic field undergoes a collisionless change of structure, leading to large-scale, long-lived structures. These processes may be important for the understanding of magnetic field generation in laser plasmas and in space plasmas in the regions where two stellar winds collide.