论文标题
通过调节脉冲轮廓通过凸聚焦等离子体镜来生成全光孔顿光子源。
All-optical Compton photon source generation via modulating pulse profile by convex focusing plasma mirror
论文作者
论文摘要
一个相对有效的方案生成能量$γ$ -Ray是基于Wakefield加速度和等离子体镜的全光综合散射，通常使用平面或凹入固体目标来反映驱动脉冲。对于平面等离子体镜情况，碰撞脉冲半径远大于加速电子束的半径，这会导致较小的激光利用效率。凹入的等离子体镜可以有效聚焦反射激光以匹配电子束半径。但是，由于密集的横向场和碰撞激光的较大横向波矢量，产生的光子束的直接效果较差。在这里，我们提出了一种新的机制，可以通过使用凸等离子体镜来实现康普顿散射。凸等离子体镜除了聚焦效果外，还可以改善反射激光纵向长度，从而确保较长的碰撞时间和较大的激光利用效率。重要的是，它导致碰撞激光的横向波向量变小，这可以确保更好的光子束准直接。
A relatively efficient scheme to generate energetic $γ$-ray is all-optical Compton scattering based on wakefield acceleration and plasma mirror where planar or concave solid target is usually employed to reflect driving pulse. For flat plasma mirror case, the colliding pulse radius is far larger than the radius of accelerated electron beam, which leads to smaller laser utilization efficiency. The concave plasma mirror can efficiently focus reflected laser to match electron beam radius. But the produced photon beam collimation is worse due to intensive transverse field and larger transverse wave vector of colliding laser. Here, we propose a new mechanism to achieve Compton scattering via employing convex plasma mirror. The convex plasma mirror improves reflected laser longitudinal length in addition to focusing effect, which ensures longer colliding time and larger laser utilization efficiency. Importantly, it leads transverse wave vector of colliding laser to be smaller, which guarantees better photon bunch collimation.
