A new electron injection scheme is proposed in sub-relativistic plasma wakefield accelerators. A transverse laser ionizes a dopant gas and ponderomotively accelerates the released electrons in the direction of wake propagation. This process enables electron trapping in the wakefield even for a wakefield potential below the trapping threshold. We study the scheme theoretically and by means of particle-in-cell simulations to demonstrate high-quality beam formation and acceleration with sub-micrometer normalized emittances and sub-percent uncorrelated energy spreads.

中文翻译：

---

等离子体尾波场加速器中的动力辅助电离注入

在亚相对论等离子体尾流加速器中提出了一种新的电子注入方案。横向激光电离掺杂气体，并在尾流传播方向上有质地加速释放的电子。即使尾流场电位低于俘获阈值，该过程也能在尾流场中俘获电子。我们从理论上研究了该方案，并通过细胞内粒子模拟来证明具有亚微米归一化发射率和亚百分比不相关能量传播的高质量光束形成和加速。