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首页> 外文期刊>Plasma physics and controlled fusion >Probing thermal Weibel instability in optical-field-ionized plasmas using relativistic electron bunches
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Probing thermal Weibel instability in optical-field-ionized plasmas using relativistic electron bunches

机译：使用相对论电子束探测光场电离等离子体中的热Weibel不稳定性

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Thermal Weibel instability driven by anisotropic velocity distributions is an important mechanism for self-generating magnetic fields in both laboratory and space plasmas. However, there is a lack of experimental data on thermal Weibel instability due to the difficulty of initializing anisotropic distributions in a controllable manner as well as the challenge of probing the magnetic fields with high spatiotemporal resolution. Here we show that the initial electron velocity distribution of optical-field-ionized plasmas can be easily manipulated by changing laser polarization and such plasmas are unstable to the thermal Weibel instability. The topology of the self-generated magnetic fields depends on the laser polarization. We propose to use ultrashort relativistic electron beams such as those produced by a laser wakefield accelerator as a probe to record the spatiotemporal evolution of the magnetic fields. By taking a series of snapshots of the magnetic fields at different times, the wavevector spectrum and growth rate of the instability can be deduced and compared with kinetic theory.
机译：通过各向异性速度分布驱动的热Weibel不稳定性是实验室和空间等离子体中自成磁场的重要机制。然而，由于难以以可控方式初始化各向异性分布以及探测具有高时的磁场的挑战，缺乏关于热Weibel不稳定性的实验数据。在这里，我们表明，通过改变激光偏振可以容易地操纵光场电离等离子体的初始电子速度分布，并且这种等离子体对热Weibel不稳定性不稳定。自生成磁场的拓扑取决于激光偏振。我们建议使用超短相对论的电子束，例如由激光韦克菲尔德加速器产生的那些，作为记录磁场的时空演变的探针。通过在不同时间拍摄磁场的一系列快照，可以与动力学理论相比，可以推导出毫无稳定性的波波谱和生长速率。

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