论文标题
通过从极化电子中的偏振电场传递高度极化的正电子光束
Production of Highly Polarized Positron Beams via Helicity Transfer from Polarized Electrons in a Strong Laser Field
论文作者
论文摘要
在理论上研究了超明圆极化激光脉冲与纵向自旋的超极化超层次电子束的相互作用期间，通过非线性BREIT轮毂工艺产生高偏振的正电子光束。采用完全自旋分辨量子概率的一种新的蒙特卡洛方法是在局部恒定场近似下开发的，以在强激光场中包括三维极化效应。产生的主子通过高能光子的介质从极化电子传递的极化纵向极化。对于以较小的偏转角移动的能量正值，极化转移效率可以接近100 \％。此方法简化了选择后的过程，以在进一步的应用中生成高质量的正值。在可行的情况下，高度两极化的（$ 40 \％-65 \％$），Intense（$ 10^5 $/bunch $ -10^6 $/bunch），准直（$ 5 $ MRAD $ -70 $ MRAD）POTITRON BEAM可以在forstosecond Timescale中获得。纵向极化的正电子源对于高能物理和材料科学的应用是可取的。
The production of a highly-polarized positron beam via nonlinear Breit-Wheeler processes during the interaction of an ultraintense circularly polarized laser pulse with a longitudinally spin-polarized ultrarelativistic electron beam is investigated theoretically. A new Monte Carlo method employing fully spin-resolved quantum probabilities is developed under the local constant field approximation to include three-dimensional polarizations effects in strong laser fields. The produced positrons are longitudinally polarized through polarization transferred from the polarized electrons by the medium of high-energy photons. The polarization transfer efficiency can approach 100\% for the energetic positrons moving at smaller deflection angles. This method simplifies the post-selection procedure to generate high-quality positrons in further applications. In a feasible scenario, a highly polarized ($40\%-65\%$), intense ($10^5$/bunch$-10^6 $/bunch), collimated ($5$mrad$-70$ mrad) positron beam can be obtained in a femtosecond timescale. The longitudinally polarized positron sources are desirable for applications in high-energy physics and material science .
