Detection method of accuracy of laser-electron-beam interaction
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摘要: 超强激光脉冲与相对论电子束相互对撞是当前主要的强场量子电动力学（QED）实验手段。如何测量超强激光脉冲和电子束对撞的准确度，进而实现微米精度的准确对撞，是目前限制实验发展的重要因素。利用蒙特卡罗数值模拟方法，系统研究了超强激光脉冲和相对论电子束相互对撞过程，重点关注了电子和辐射光子动力学信息与激光脉冲和电子束对撞偏移量之间的对应关系。研究发现：辐射光子的空间分布信息，可以有效反映出激光脉冲和电子束的对撞偏移量。基于该研究结果，实验中可利用光子空间分布的信息，实现对激光脉冲和电子束对撞准确度的调节，从而有望促进强场QED实验技术的发展。Abstract: The interaction between an ultra-intense laser pulse and a relativistic electron beam is the main experimental method of strong-field quantum electrodynamics (QED). However, how to measure the accuracy of laser-electron-beam interaction, and then realize the accurate collision of micron precision, is a crucial reason limiting the development of strong-field QED experiments. Here, the dynamics of electrons and photons emitted during the interaction of an ultra-intense laser pulse and a relativistic electron beam is investigated via Monte Carlo numerical simulations. The correlation between the dynamics of electrons and emitted photons with the collision offset of laser pulse and electron beam is explored. Our simulations show that the spatial distribution information of emitted photons can effectively reflect the collision offset of the laser pulse and the electron beam. Based on the research results, the information of photon spatial distribution detected can be used to adjust the accuracy of laser- electron-beam interactions, which is expected to promote the development of strong field QED experimental technology.
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图 1 辐射光子能量在横向偏折角空间分布
Figure 1. Distribution of emitted photon energy with respect to transverse deflection angles
图 2 光子分布信息与对撞偏差间的联系
Figure 2. Connection between emitted photon distribution and collision offset
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