Anomalous plasma acceleration in colliding high-power laser-produced plasmas
Anomalous plasma acceleration in colliding high-power laser-produced plasmas
复制标题
DOI：
10.1063/1.5100197
复制
发表时间：
2019-09
影响因子：
2.2
通讯作者：
T. Morita;K. Nagashima;M. Edamoto;K. Tomita;T. Sano;Y. Itadani;R. Kumar;M. Ota;S. Egashira;R. Yamazaki;S. Tanaka;S. Tomita;S. Tomiya;H. Toda;I. Miyata;S. Kakuchi;S. Sei;N. Ishizaka;S. Matsukiyo;Y. Kuramitsu;Y. Ohira;M. Hoshino;Y. Sakawa
中科院分区：
文献类型：
--
作者：
T. Morita;K. Nagashima;M. Edamoto;K. Tomita;T. Sano;Y. Itadani;R. Kumar;M. Ota;S. Egashira;R. Yamazaki;S. Tanaka;S. Tomita;S. Tomiya;H. Toda;I. Miyata;S. Kakuchi;S. Sei;N. Ishizaka;S. Matsukiyo;Y. Kuramitsu;Y. Ohira;M. Hoshino;Y. Sakawa
我们开发了一个实验平台，用于研究在外部磁场中的磁场重联等离子体成像，流速和磁场变化的同时测量。在这里，我们研究了高功率激光束产生的逆流等离子体中的停滞和加速。垂直于初始流动方向的等离子体流通过激光汤姆逊散射测量。有趣的是，流动向高密度区域加速，这与压力梯度加速的方向相反。这种加速可能是由最初由比尔曼电池效应产生的两个磁场环的相互作用解释的，导致磁重联形成单个场环和磁张力的额外加速。
We developed an experimental platform for studying magnetic reconnection in an external magnetic field with simultaneous measurements of plasma imaging, flow velocity, and magnetic-field variation. Here, we investigate the stagnation and acceleration in counterstreaming plasmas generated by high-power laser beams. A plasma flow perpendicular to the initial flow directions is measured by laser Thomson scattering. The flow is, interestingly, accelerated toward the high-density region, which is opposite to the direction of the acceleration by pressure gradients. This acceleration is possibly interpreted by the interaction of two magnetic field loops initially generated by the Biermann battery effect, resulting in a magnetic reconnection forming a single field loop and additional acceleration by a magnetic tension force.