论文标题
载体 - Envelope相控制的相对论电子光束的动力学
Carrier-envelope phase controlled dynamics of relativistic electron beams in a laser-wakefield accelerator
论文作者
论文摘要
在激光效率的加速度中，超强度激光脉冲聚焦于低强度血浆中，以便将电子加速到相对论速度。在大多数情况下，脉冲由多个光学循环组成，在蓬源力量的框架中很好地描述了相互作用，其中只能考虑激光的包膜。但是，当使用单周期脉冲时，必须考虑到激光的实际波形。在本文中，我们使用近节循环激光脉冲来驱动激光效率加速器。我们观察到指向在极化方向上10 mrad的电子束的变化，以及梁电荷的30％变化，锁定在氮和氦等离子体中的受控激光载体 - Envelope阶段的值。这些发现是通过粒子中的模拟来解释的，表明低阳性，超短电子束被与滑动载流子 - 固定载体相关的横向振荡气泡定期注射外轴。
In laser-wakefield acceleration, an ultra-intense laser pulse is focused into an underdense plasma in order to accelerate electrons to relativistic velocities. In most cases, the pulses consist of multiple optical cycles and the interaction is well described in the framework of the ponderomotive force where only the envelope of the laser has to be considered. But when using single-cycle pulses, the ponderomotive approximation breaks down, and the actual waveform of the laser has to be taken into account. In this paper, we use near-single cycle laser pulses to drive a laser-wakefield accelerator. We observe variations of the electron beam pointing on the order of 10 mrad in the polarisation direction, as well as 30% variations of the beam charge, locked to the value of the controlled laser carrier-envelope phase, in both nitrogen and helium plasma. Those findings are explained through particle-in-cell simulations indicating that low-emittance, ultra-short electron bunches are periodically injected off-axis by the transversally oscillating bubble associated with the slipping carrier-envelope phase.
