Generation of bright attosecond x-ray pulse trains via Thomson scattering from laser-plasma accelerators.
Generation of bright attosecond x-ray pulse trains via Thomson scattering from laser-plasma accelerators.
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DOI：
10.1364/oe.22.032098
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发表时间：
2014-12
期刊：
影响因子：
3.8
通讯作者：
W. Luo;T. Yu;M. Chen;Y. M. Song;Z. Zhu;Y. Ma;H. Zhuo
中科院分区：
文献类型：
--
作者：
W. Luo;T. Yu;M. Chen;Y. M. Song;Z. Zhu;Y. Ma;H. Zhuo
阿秒X射线脉冲的产生由于其潜在的广泛应用而在先进光源用户群体中引起越来越多的关注。在这里，我们提出了一个全光学方案，以产生明亮的，阿秒硬x射线脉冲串的汤姆逊背散射的类似结构的电子束在真空通道中产生的紧密聚焦的激光脉冲。概念验证实验的设计参数，并证明了通过使用粒子在细胞的代码和四维激光康普顿散射模拟代码来模拟基于激光的电子加速和汤姆逊散射过程。观察到了200阿秒持续时间的硬X射线脉冲序列，其光子能量接近50 keV，每个微束团的最大峰值亮度高达1020光子/s/mm ~ 2/mrad ~ 2/0.1%BW。所提出的产生阿秒X射线脉冲序列的物理方案可以直接获得与原子、分子和材料中的电子动力学相关的最快时间尺度。
Generation of attosecond x-ray pulse attracts more and more attention within the advanced light source user community due to its potentially wide applications. Here we propose an all-optical scheme to generate bright, attosecond hard x-ray pulse trains by Thomson backscattering of similarly structured electron beams produced in a vacuum channel by a tightly focused laser pulse. Design parameters for a proof-of-concept experiment are presented and demonstrated by using a particle-in-cell code and a four-dimensional laser-Compton scattering simulation code to model both the laser-based electron acceleration and Thomson scattering processes. Trains of 200 attosecond duration hard x-ray pulses holding stable longitudinal spacing with photon energies approaching 50 keV and maximum achievable peak brightness up to 1020 photons/s/mm2/mrad2/0.1%BW for each micro-bunch are observed. The suggested physical scheme for attosecond x-ray pulse trains generation may directly access the fastest time scales relevant to electron dynamics in atoms, molecules and materials.