Center for Applied Physics and Technology, HEDPS, and State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, People's Republic of China.
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, People's Republic of China.
Phys Rev E. 2016 Mar;93(3):033206. doi: 10.1103/PhysRevE.93.033206. Epub 2016 Mar 24.
The dynamics of magnetic reconnection (MR) in the high-energy-density (HED) regime, where the plasma inflow is strongly driven and the thermal pressure is larger than the magnetic pressure (β>1), is reexamined theoretically and by particle-in-cell simulations. Interactions of two colliding laser-produced plasma bubbles with self-generated poloidal magnetic fields of, respectively, antiparallel and parallel field lines are considered. Through comparison, it is found that the quadrupole magnetic field, bipolar poloidal electric field, plasma heating, and even the out-of-plane electric field can appear in both cases due to the mere plasma bubble collision, which may not be individually recognized as evidences of MR in the HED regime separately. The Lorentz-invariant scalar quantity D(e) ≃ γ(e)j · (E + v(e) × B) (γ(e) = 1-(v(e)/c)(2)) in the electron dissipation region is proposed as the key sign of MR occurrence in this regime.
在高能密度（HED）条件下，磁重联（MR）的动力学过程得到了重新审视，该条件下的等离子体流入被强烈驱动，热压力大于磁压力（β>1）。通过理论和粒子模拟的方法对该过程进行了研究。考虑了两个激光产生的等离子体泡的碰撞，它们分别具有相互反向和同向的极向磁场。通过比较，发现由于仅仅是等离子体泡的碰撞，在两种情况下都可能出现四极磁场、双极极向电场、等离子体加热，甚至是出平面电场，这些可能无法单独被识别为 HED 条件下的 MR 证据。在电子耗散区域中，提出了洛伦兹不变标量量 D(e)≃γ(e)j·(E+v(e)×B)（γ(e)=1-(v(e)/c)(2)）作为该条件下 MR 发生的关键标志。
