Detection of current-sheet and bipolar ion flows in a self-generated antiparallel magnetic field of laser-produced plasmas for magnetic reconnection research
Detection of current-sheet and bipolar ion flows in a self-generated antiparallel magnetic field of laser-produced plasmas for magnetic reconnection research
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DOI：
10.1103/physreve.106.055207
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发表时间：
2022-11-10
影响因子：
2.4
通讯作者：
Sakawa, Y.
中科院分区：
文献类型：
--
作者：
Morita, T.;Kojima, T.;Sakawa, Y.
利用光学诊断方法研究了激光产生的磁化等离子体中的磁场重联。磁场通过比尔曼电池效应产生，并且反向磁场线彼此相互作用。自发射测量表明，两个碰撞的等离子体停滞在一个中平面上，形成两个平面密集区，它们相互作用的时间较晚。激光汤姆逊散射谱在自生磁场方向上发生畸变，表明离子速度分布和等离子体加速不对称。此外，垂直于磁场的光谱显示出不同的峰强度，表明电子电流的形成。这些结果被解释为磁场耗散、重联和外流加速。双向激光汤姆逊散射，如这里所讨论的，是一个强大的工具，在重联区域的微观物理研究。
Magnetic reconnection in laser-produced magnetized plasma is investigated by using optical diagnostics. The magnetic field is generated via the Biermann battery effect, and the inversely directed magnetic field lines interact with each other. It is shown by self-emission measurement that two colliding plasmas stagnate on a midplane, forming two planar dense regions, and that they interact later in time. Laser Thomson scattering spectra are distorted in the direction of the self-generated magnetic field, indicating asymmetric ion velocity distribution and plasma acceleration. In addition, the spectra perpendicular to the magnetic field show different peak intensity, suggesting an electron current formation. These results are interpreted as magnetic field dissipation, reconnec-tion, and outflow acceleration. Two-directional laser Thomson scattering is, as discussed here, a powerful tool for the investigation of microphysics in the reconnection region.