近日，美国密歇根大学的Brandon K. Russell与美国劳伦斯伯利克国家实验室的Stepan S. Bulanov等人合作并取得一项新进展。他们通过测量光子角光谱中的特征来区分非线性康普顿散射模型。相关研究成果已于2024年12月24日在国际知名学术期刊《物理评论A》上发表。

本文确定了可通过实验测量的特征，这些特征可能能够区分辐射反应模型（即经典模型或量子模型），或区分用于计算非线性康普顿过程特性的，局部恒定场近似和局部单色近似。研究人员通过蒙特卡洛模拟考虑了，与当今激光设施相关的各种实验条件下的这些特征，并提出了潜在的测量这些特征的方案。

研究人员发现，通过计数千电子伏特光子的单次发射以解决谐波问题，以及通过闪烁体探测器检测兆电子伏特光子，可能使研究人员能够分别验证，非线性康普顿散射模型和辐射反应模型。这将需要发散角小于2毫弧度且能量分散小于20%的电子束。

据悉，高能电子束与激光脉冲的碰撞，可用于研究强场量子电动力学中的辐射反应、非线性康普顿散射等许多其他过程。对于这些相互作用的模拟和理论预测，依赖于一系列尚未经过实验验证的近似和假设。

附：英文原文

Title: Measuring signatures in photon angular spectra to distinguish nonlinear Compton scattering models

Author: Brandon K. Russell1,*, Stepan S. Bulanov2, Qian Qian1, Christopher Arran3, Thomas G. Blackburn4, Sergei V. Bulanov5,6, Gabriele M. Grittani5, Stuart P. D. Mangles7, Christopher P. Ridgers3 et al.

Issue&Volume: 2024-12-24

Abstract: The collision of a high-energy electron beam with a laser pulse may be used to study radiation reaction and nonlinear Compton scattering among many other processes in strong-field quantum electrodynamics. Predictions from simulation and theory for these interactions rely on a number of approximations and assumptions that have not been experimentally tested. Here, experimentally measurable signatures are identified that might be able to distinguish between radiation reaction models, i.e., classical or quantum, or between the local constant field and local monochromatic approximations used to calculate the properties of the nonlinear Compton process. These signatures are considered through Monte Carlo simulations of various experimental conditions that are relevant to today's laser facilities. Potential detection schemes for measuring the signatures are proposed. We find that single-photon counting of keV photons to resolve harmonics and scintillator-based detection of MeV photons may allow us to validate nonlinear Compton scattering models and radiation reaction models respectively. This will require electron beams with divergence angles less than 2 mrad and less than 20% energy spread.

DOI: 10.1103/PhysRevA.110.062822

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.062822