Temporal evolution of longitudinal bunch profile in a laser wakefield accelerator
Temporal evolution of longitudinal bunch profile in a laser wakefield accelerator
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DOI：
10.1103/physrevstab.18.121302
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发表时间：
2015-12-16
影响因子：
--
通讯作者：
Schmidt, B.
中科院分区：
文献类型：
--
作者：
Heigoldt, M.;Popp, A.;Schmidt, B.
我们基于宽光谱范围内相干跃迁辐射的检测，提出了具有亚飞秒分辨率的激光尾波场加速器的纵向束团轮廓的单次测量。先前开发的相位恢复算法可以重建束轮廓，而无需事先假设其形状。在这项研究中，使用可变长度的气体靶来探索束团演化的动力学。我们的结果表明，一旦激光能量耗尽，生成的电子束的时间结构就会从单束变成双束结构，非常适合驾驶员见证类型的实验。
We present single-shot measurements of the longitudinal bunch profile from a laser-wakefield accelerator with sub-fs resolution, based on detection of coherent transition radiation in a broad spectral range. A previously developed phase retrieval algorithm enables reconstruction of the bunch profile without prior assumptions about its shape. In this study, a variable-length gas target is used to explore the dynamics of bunch evolution. Our results show that once the laser energy is depleted the time structure of the generated electron beam changes from a single bunch to a double bunch structure, well suited for driver-witness type experiments.