利用非线性康普顿散射单次测量超相对论电子束的自旋极化
Single-shot determination of spin-polarization for ultrarelativistic electron beams via nonlinear Compton scattering
摘要：
在量子辐射区研究了自旋极化的超相对论电子束与强激光脉冲正面碰撞后的光子发射谱和电子动力学行为。在定域常场近似下，采用自旋分辨辐射几率，半经典地模拟了光子发射和电子动力学。激光场的小椭圆率导致角分辨光子谱的不对称性，这敏感地依赖于电子束的偏振。这种不对称性在高能光子谱中特别重要，并且被用于以非常高的精度对高能电子束进行偏振检测，例如，对于密度为$10^{16}$ cm $^{-3}$的几GeV电子束，在目前可用的强激光场下，该方法首次提出了一种通过非线性康普顿散射单次确定超相对论电子束极化的方法。基于自旋相关辐射反应引起的相互作用后电子动量分布的不对称性，提出了一种类似的方法。
英文摘要：
Impacts of spin-polarization of an ultrarelativistic electron beam head-on colliding with a strong laser pulse on emitted photon spectra and electron dynamics have been investigated in the quantum radiation regime. We simulate photon emissions quantum mechanically and electron dynamics semiclassically via taking spin-resolved radiation probabilities in the local constant field approximation. A small ellipticity of the laser field brings about an asymmetry in angle-resolved photon spectrum, which sensitively relies on the polarization of the electron beam. The asymmetry is particularly significant in high-energy photon spectra, and is employed for the polarization detection of a high-energy electron beam with extraordinary precision, e.g., better than 0.3\% for a few-GeV electron beam at a density of the scale of $10^{16}$ cm$^{-3}$ with currently available strong laser fields. This method demonstrates for the first time a way of single-shot determination of polarization for ultrarelativistic electron beams via nonlinear Compton scattering. A similar method based on the asymmetry in the electron momentum distribution after the interaction due to spin-dependent radiation reaction is proposed as well.
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