超强laser脉冲中超相对论电子辐射极化的随机性
Stochasticity in radiative polarization of ultrarelativistic electrons in an ultrastrong laser pulse
摘要：
本文研究了量子辐射反应体系中，反向传播的超强聚焦激光脉冲辐射光子时，超相对论电子束自旋（去）极化的随机性效应。我们采用蒙特卡罗方法来描述电子动力学的半经典，光子发射以及电子辐射极化量子力学。而在后者的光子发射本质上是随机的，我们能够确定其印记相比，新开发的半经典随机性自由的方法适用于量子制度的辐射偏振。对于初始自旋极化的电子束，在退极化度对电子散射角和电子最终能量（自旋随机扩散）的依赖性中可以看到随机自旋效应。对于初始未极化的电子束，自旋随机性表现为增强了椭圆偏振激光脉冲沿传播方向将电子束分裂成两个相反偏振部分的已知效果。所考虑的随机性效应的自旋是可观察到的，目前可实现的激光和电子束参数。
英文摘要：
Stochasticity effects in the spin (de)polarization of an ultrarelativistic electron beam during photon emissions in a counterpropoagating ultrastrong focused laser pulse in the quantum radiation reaction regime are investigated. We employ a Monte Carlo method to describe the electron dynamics semiclassically, and photon emissions as well as the electron radiative polarization quantum mechanically. While in the latter the photon emission is inherently stochastic, we were able to identify its imprints in comparison with the new developed semiclassical stochasticity-free method of radiative polarization applicable in the quantum regime. With an initially spin-polarized electron beam, the stochastic spin effects are seen in the dependence of the depolarization degree on the electron scattering angle and the electron final energy (spin stochastic diffusion). With an initially unpolarized electron beam, the spin stochasticity is exhibited in enhancing the known effect of splitting of the electron beam along the propagation direction into two oppositely polarized parts by an elliptically polarized laser pulse. The considered stochasticity effects for the spin are observable with currently achievable laser and electron beam parameters.
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