Push and pull magnetic reconnection (MR) experiments using high-power laser irradiating a capacitor target with the plates connected by a pair of U-shaped coils are carried out. During the beginning (end) of the laser-target interaction that creates a hot plasma in the region, the rise (fall) stages of the coil currents generates expanding (contracting) magnetic fields that reconnect in the midplane between the coils, resulting in push (pull) MR. Proton radiography and proton ray-tracing simulation are used to track the evolution of the magnetic fields. The proton accumulation and void formation between the coils are related to the oppositely directed current-sheet currents during the push and pull MR stages. The directions of the plasma electron outflows during these two MR phases are obtained by monitoring the soft x-ray emission. Our results suggest that the double-coil capacitor target may be useful for laboratory modeling of fast MR and related phenomena in astrophysical plasmas.
高功率激光照射由一对U形线圈连接的电容靶，开展了推斥型和拉曳型磁重联实验。在激光与靶相互作用期间，产生等离子体的初期（末期），线圈电流的上升（下降）阶段所生成的膨胀（收缩）磁场在双线圈之间的中平面发生重联，从而形成推斥型（拉曳型）磁重联。利用质子照相和质子射线追踪模拟，追踪了磁场的演化过程。在推斥型和拉曳型磁重联阶段，双线圈之间质子堆积和空洞的形成与反向平行电流片相关。通过监测软X射线辐射，获得了这两个磁重联阶段等离子体电子外流的方向。我们的结果表明，双线圈电容靶可用于实验室模拟天体等离子体中的快速磁重联及相关现象。