当前位置: X-MOL 学术Plasma Phys. Control. Fusion › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Particle-in-cell simulations of asymmetric reconnection driven by laser-powered capacitor coils
Plasma Physics and Controlled Fusion ( IF 2.2 ) Pub Date : 2020-11-21 , DOI: 10.1088/1361-6587/abc600
Kai Huang 1, 2 , Quanming Lu 1, 2 , Abraham Chien 3 , Lan Gao 3 , Hantao Ji 3, 4 , Xueyi Wang 5 , Shui Wang 1, 2
Affiliation  

During magnetic reconnection, such as in the magnetopause of magnetized planets, the upstream plasma conditions between the two inflow regions are usually different. In this paper, we demonstrate that such a kind of asymmetric reconnection can be studied in the laboratory using the recently proposed experimental scheme where reconnection is driven by laser-powered capacitor coils. Two-dimensional particle-in-cell simulations on the $\left( {z,r} \right)$ plane in a cylindrical coordinate are conducted to study magnetic reconnection with the inflow along the $r$ direction. Magnetic reconnection is found to be asymmetric with a stronger magnetic field in the inner (small $r$) inflow region and a weaker magnetic field in the outer (large $r$) inflow region due to the cylindrical symmetric geometry. Electron crescent velocity distributions are observed near the flow stagnation point while ion crescent velocity distributions are observed in the region with Larmor electric field. The out-of-plane Hall magnetic field is asymmetric between the two inflow regions with a larger spatial scale in the outer inflow region. This asymmetric Hall magnetic field configuration is different from that in previous studies. The typical reconnection rate increases with a stronger driver and the highest rate is around 0.2${V_A}{B_0}$, where $B_0$ is the typical value of the magnetic field and $V_A$ is the Alfven speed. This study provides a new method to experimentally study asymmetric reconnection in the laboratory and has potential applications regarding magnetic reconnection in the magnetopause of magnetized planets.



中文翻译:

由激光供电的电容器线圈驱动的非对称重新连接的粒子模拟

在磁重新连接期间,例如在磁化行星的磁绝磁期间,两个流入区域之间的上游等离子体条件通常不同。在本文中,我们证明可以使用最近提出的实验方案在实验室中研究这种不对称重新连接,该方案通过激光供电的电容器线圈驱动重新连接。$ \ left({z,r} \ right)$在圆柱坐标系中的平面上进行了二维单元格内粒子模拟,以研究沿$ r $方向流入的磁重联。发现磁重新连接是不对称的,内部(较小$ r $)流入区域的磁场较强,而外部(较大)流入区域的磁场较弱$ r $)由于圆柱对称几何形状的流入区域。在流动停滞点附近观察到电子新月形速度分布,而在拉莫尔电场区域观察到离子新月形速度分布。平面外霍尔磁场在两个流入区域之间是不对称的,在外部流入区域中的空间比例较大。这种非对称霍尔磁场配置不同于先前的研究。驱动器越强,典型的重新连接速率就越高,最高重新连接速率约为0.2 $ {V_A} {B_0} $,这$ B_0 $是磁场的典型值和$ V_A $是Alfven的速度。这项研究提供了一种在实验室中通过实验研究不对称重新连接的新方法,并且在磁化行星的磁更年期中的磁重新连接方面具有潜在的应用。

更新日期:2020-11-21
down
wechat
bug