Electron acceleration by wave turbulence in a magnetized plasma-猫眼课题宝

DOI：

10.1038/s41567-018-0059-2

发表时间：

2018-03

期刊：

Nature Physics

影响因子：

19.6

通讯作者：

中科院分区：

物理与天体物理1区

文献类型：

作者：

A. Rigby;F. Cruz;B. Albertazzi;R. Bamford;A. Bell;J. Cross;F. Fraschetti;P. Graham;Y. Hara;P. Kozlowski;Y. Kuramitsu;D. Lamb;S. Lebedev;J. Marquès;F. Miniati;T. Morita;M. Oliver;B. Reville;Y. Sakawa;Sreyash Sarkar;C. Spindloe;R. Trines;P. Tzeferacos;L. Silva;R. Bingham;M. Koenig;G. Gregori

天体物理冲击通常由高能电子在原地加速的非热发射所揭示。强烈的冲击预计将加速粒子到非常高的能量，-;然而，他们需要一个粒子源的速度足够快，以允许多个冲击交叉。虽然由此产生的扩散激波加速过程可以解释观测结果，但调节非热粒子连续注入的动力学物理学还没有得到很好的理解。事实上，这种注入问题对于电子来说尤其严重，电子依赖于高频等离子体波动将它们提升到热池上方。在这里，我们表明，使用实验室激光产生的冲击实验，在强磁场的存在下，实现显着的电子预热。我们表明，在生产这些高能电子的关键机制是通过冲击反射离子的低混合湍流的产生。我们的实验结果与许多天体物理系统类似，包括彗星与太阳风的相互作用，这是一种通过低混合波加速电子的可能性。

Astrophysical shocks are commonly revealed by the non-thermal emission of energetic electrons accelerated in situ, –. Strong shocks are expected to accelerate particles to very high energies, –; however, they require a source of particles with velocities fast enough to permit multiple shock crossings. While the resulting diffusive shock acceleration process can account for observations, the kinetic physics regulating the continuous injection of non-thermal particles is not well understood. Indeed, this injection problem is particularly acute for electrons, which rely on high-frequency plasma fluctuations to raise them above the thermal pool,. Here we show, using laboratory laser-produced shock experiments, that, in the presence of a strong magnetic field, significant electron pre-heating is achieved. We demonstrate that the key mechanism in producing these energetic electrons is through the generation of lower-hybrid turbulence via shock-reflected ions. Our experimental results are analogous to many astrophysical systems, including the interaction of a comet with the solar wind, a setting where electron acceleration via lower-hybrid waves is possible.

Electron acceleration by wave turbulence in a magnetized plasma

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