Inefficient Magnetic-Field Amplification in Supersonic Laser-Plasma Turbulence
Inefficient Magnetic-Field Amplification in Supersonic Laser-Plasma Turbulence
复制标题
DOI：
10.1103/physrevlett.127.175002
复制
发表时间：
2021-10-21
影响因子：
8.6
通讯作者：
Casner, A.
中科院分区：
文献类型：
--
作者：
Bott, A. F. A.;Chen, L.;Casner, A.
本文报道了在lj - petal设备上进行的激光等离子体实验，并在实验室中实现了第一个具有大磁雷诺数（Rm 45）的磁化、湍流、超音速（Maturb 2.5）等离子体。初始种子磁场被放大，但只是适度放大，并且没有变得动态显著。在比湍流级联外尺度更小的尺度上也观察到明显的磁能缺失。我们的研究结果支持这样一种观点，即与亚音速、不可压缩的等离子体湍流相比，中等超音速、低磁普朗特数等离子体湍流在放大磁场方面效率低下。
We report a laser-plasma experiment that was carried out at the LMJ-PETAL facility and realized the first magnetized, turbulent, supersonic (Maturb 2.5) plasma with a large magnetic Reynolds number (Rm 45) in the laboratory. Initial seed magnetic fields were amplified, but only moderately so, and did not become dynamically significant. A notable absence of magnetic energy at scales smaller than the outer scale of the turbulent cascade was also observed. Our results support the notion that moderately supersonic, low-magnetic-Prandtl-number plasma turbulence is inefficient at amplifying magnetic fields compared to its subsonic, incompressible counterpart.