Direct Observation of the Injection Dynamics of a Laser Wakefield Accelerator Using Few-Femtosecond Shadowgraphy
Direct Observation of the Injection Dynamics of a Laser Wakefield Accelerator Using Few-Femtosecond Shadowgraphy
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DOI：
10.1103/physrevlett.115.055002
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发表时间：
2015-07-28
影响因子：
8.6
通讯作者：
Kaluza, M. C.
中科院分区：
文献类型：
--
作者：
Saevert, A.;Mangles, S. P. D.;Kaluza, M. C.
我们给出了在激光尾波场加速器中等离子体波的非线性演化过程中用横向同步的少周期探测脉冲拍摄的少飞秒阴影快照。这些快照可以直接与等离子体波中的电子密度分布相关联，并提供有关其大小和形状的定量信息。结果表明，电子自注入到第一等离子体波周期是由第一等离子体波周期的加长引起的。三维细胞内粒子模拟支持我们的观察结果。
We present few-femtosecond shadowgraphic snapshots taken during the nonlinear evolution of the plasma wave in a laser wakefield accelerator with transverse synchronized few-cycle probe pulses. These snapshots can be directly associated with the electron density distribution within the plasma wave and give quantitative information about its size and shape. Our results show that self-injection of electrons into the first plasma-wave period is induced by a lengthening of the first plasma period. Three-dimensional particle-in-cell simulations support our observations.