Comparison of different improvements to mainstream model of nonlinear Compton scattering
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摘要: 非线性康普顿散射被认为是未来超短超强激光与物质相互作用中的主导性物理过程之一。目前大多数相关研究都基于一种主流的非线性康普顿散射物理模型，该模型假设辐射形成距离足够短、对初态和末态自旋求平均与求和、并忽略了参与散射的激光光子的能动量。近年来，一些研究为了在更广阔的参数空间内，更准确地描述非线性康普顿散射，也对这个主流物理模型提出了几种修正和改进。回顾了对非线性康普顿散射主流物理模型进行的几种改进和修正，介绍了它们的适用范围，分析了它们的基本性质并对其物理效应进行了简单讨论。
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关键词:
- 非线性康普顿散射 /
- 偏振 /
- 相干激光光子的能动量 /
- 相干长度 /
- 量子加速
Abstract: Nonlinear Compton scattering is one of the dominant processes in future ultra-short ultra-intense laser-matter interactions. Today, most related researches are based on the mainstream model of nonlinear Compton scattering, which assumes short radiation formation interval, ignores effects of involved laser photon energy and is not spin-resolved. To depict nonlinear Compton scattering more precisely in wider parameter space, improved theories beyond these assumptions have been proposed in recent years. In this paper, we reviewe the major recent improvements, analyze their applicability, discusse their basic characteristics and physical effects on nonlinear Compton scatterings. -
图 2 参与非线性康普顿散射的激光光子能动量对产生的伽马光子的发射角度的影响。ρ为正(a)和负(b)的分支中辐射出的伽马光子与电子初始方向的夹角，参数为电子初始能量为2 GeV，φ=π/6，撞击的激光波长1 μm，横坐标给出的功率密度为瞬时功率密度。作为对比，目前的主流模型假设该发射角为0
Figure 2. Effects of involved laser photons in nonlinear Compton scattering on the emission angle of gamma photon
图 3 参与非线性康普顿散射的激光光子能动量对产生的伽马光子的能谱的影响
Figure 3. Effects of involved laser photons in nonlinear Compton scattering on the spectrum of emitted gamma photon
图 4 无偏振电子与线偏振激光通过非线性康普顿散射产生的伽马光子的线偏振度随δ的变化趋势
Figure 4. Linear polarization rate of gamma photons emitted through NCS of linearly polarized laser with un-polarized electrons
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