Laser plasma accelerators capable of generating electron beams may require plasma mirrors to remove undepleted laser energy at the end of the stage. The electron bunch can interact with light reflected from the mirror resulting in inverse Compton scattering. For realistic conditions, we show that a significant fraction of electrons emit one or more photons, increasing the energy spread of the electron bunch. We provide an analytical expression for calculating this effect, and use it to estimate the minimum drift space required before the plasma mirror to meet given energy spread specifications. Mitigation strategies, necessary to achieve sub-percent energy spread in multi-GeV laser wakefield electron sources, are proposed and explored.

中文翻译：

---

康普顿反冲效应在激光尾场加速器分级中的作用

能够产生电子束的激光等离子加速器可能需要等离子镜以在平台结束时去除未耗尽的激光能量。电子束可以与从反射镜反射的光相互作用，从而导致康普顿逆散射。对于现实条件，我们证明了很大一部分电子发射一个或多个光子，从而增加了电子束的能量扩散。我们提供了用于计算这种效应的解析表达式，并使用它来估算等离子镜满足给定能量扩散规格之前所需的最小漂移空间。提出并探索了缓解策略，该策略对于在多GeV激光尾场电子源中实现亚百分比的能量扩散是必不可少的。