We demonstrate a novel approach to the generation of femtosecond electron bunch trains via laser-driven wakefield acceleration. We use two independent high-intensity laser pulses, a drive, and injector, each creating their own plasma wakes. The interaction of the laser pulses and their wakes results in a periodic injection of free electrons in the drive plasma wake via several mechanisms, including ponderomotive drift, wake-wake interference, and pre-acceleration of electrons directly by strong laser fields. Electron trains were generated with up to 4 quasi-monoenergetic bunches, each separated in time by a plasma period. The time profile of the generated trains is deduced from an analysis of beam loading and confirmed using 2D Particle-in-Cell simulations.

中文翻译：

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通过捕获到多个等离子体尾流场中产生超快电子束序列

我们展示了一种通过激光驱动尾流加速产生飞秒电子束序列的新方法。我们使用两个独立的高强度激光脉冲、一个驱动器和一个注入器，每个都产生自己的等离子体尾流。激光脉冲与其尾流的相互作用导致通过多种机制在驱动等离子体尾流中周期性注入自由电子，包括有质漂移、尾流干扰和强激光场直接对电子进行预加速。电子序列由多达 4 个准单能束产生，每个束在时间上被等离子体周期隔开。生成的列车的时间分布是从梁加载的分析中推导出来的，并使用 2D Particle-in-Cell 模拟进行确认。