Effect of electron-beam energy chirp on signatures of radiation reaction in laser-based experiments
Effect of electron-beam energy chirp on signatures of radiation reaction in laser-based experiments
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DOI：
10.1103/physrevaccelbeams.26.104002
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发表时间：
2023-05
影响因子：
1.7
通讯作者：
J. Magnusson;T. Blackburn;E. Gerstmayr;E. Los;M. Marklund;C. Ridgers;S. Mangles
中科院分区：
文献类型：
--
作者：
J. Magnusson;T. Blackburn;E. Gerstmayr;E. Los;M. Marklund;C. Ridgers;S. Mangles
目前研究辐射反应的实验使用高能电子束和紧密聚焦的激光脉冲，以达到量子状态，通过量子非线性参数$\chi$表示。这类实验往往因大量潜在变量（包括电子束的精确结构）而变得复杂。在这里，我们研究了电子空间和能量分布之间的相关性，称为能量啁啾，研究了它对激光-电子束相互作用的意义，并表明在分析当前实验时不能忽略由此产生的效应。特别是，我们证明了能量啁啾对电子能量的第二矩有很大的影响，但对第一电子能量矩或光子临界能量的影响较小。这些结果表明，在这样的实验中，在弹间的基础上改进电子束参数的表征和控制的重要性。
Current experiments investigating radiation reaction employ high energy electron beams together with tightly focused laser pulses in order to reach the quantum regime, as expressed through the quantum nonlinearity parameter $\chi$. Such experiments are often complicated by the large number of latent variables, including the precise structure of the electron bunch. Here we examine a correlation between the electron spatial and energy distributions, called an energy chirp, investigate its significance to the laser-electron beam interaction and show that the resulting effect cannot be trivially ignored when analysing current experiments. In particular, we show that the energy chirp has a large effect on the second moment of the electron energy, but a lesser impact on the first electron energy moment or the photon critical energy. These results show the importance of improved characterisation and control over electron bunch parameters on a shot-to-shot basis in such experiments.