We report a laser-plasma experiment that was carried out at the LMJ-PETAL facility and realized the first magnetized, turbulent, supersonic (${\mathrm{Ma}}_{\mathrm{turb}}\approx 2.5$) plasma with a large magnetic Reynolds number ($\mathrm{Rm}\approx 45$) 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.

中文翻译：

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超音速激光等离子体湍流中的低效磁场放大

我们报告了在 LMJ-PETAL 设施中进行的激光等离子体实验，该实验实现了第一个磁化、湍流、超音速（${嘛}_{\mathrm{涡轮}}\approx 2.5$) 具有大磁雷诺数的等离子体 ($\mathrm{R\; M}\approx 45$) 在实验室。初始种子磁场被放大，但只是适度放大，并没有变得动态显着。还观察到在小于湍流级联外部尺度的尺度上明显缺乏磁能。我们的结果支持这样一种观点，即与亚音速、不可压缩的对应物相比，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。