Morita T, Kojima T, Matsuo S, Matsukiyo S, Isayama S, Yamazaki R, Tanaka S J, Aihara K, Sato Y, Shiota J, Pan Y, Tomita K, Takezaki T, Kuramitsu Y, Sakai K, Egashira S, Ishihara H, Kuramoto O, Matsumoto Y, Maeda K, Sakawa Y
Faculty of Engineering Sciences, Kyushu University, 6-1 Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan.
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1, Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan.
Phys Rev E. 2022 Nov;106(5-2):055207. doi: 10.1103/PhysRevE.106.055207.
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, reconnection, and outflow acceleration. Two-directional laser Thomson scattering is, as discussed here, a powerful tool for the investigation of microphysics in the reconnection region.
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重联。磁场通过比尔曼电池效应产生，反向的磁力线相互作用。通过自发射测量表明，两个碰撞的等离子体在中平面停滞，形成两个平面密集区域，并且它们在稍后的时间相互作用。激光汤姆逊散射光谱在自生磁场方向上发生畸变，表明离子速度分布不对称和等离子体加速。此外，垂直于磁场的光谱显示出不同的峰值强度，表明形成了电子电流。这些结果被解释为磁场耗散、重联和流出加速。如本文所讨论的，双向激光汤姆逊散射是研究重联区域微观物理学的有力工具。
