论文标题
脉冲信封对电子激光碰撞中非线性康普顿散射的影响
Pulse envelope effect on nonlinear Compton scattering in electron-laser collisions
论文作者
论文摘要
计算非线性康普顿散射是针对电子与平面波脉冲碰撞的。由于与脉冲信封相关的远距离干扰，在光子光谱中出现了中红外（IR）峰。研究了扁平脉冲的情况，作为脉冲信封效应的玩具模型，并减少到两个最终状态动量积分。数值研究了正弦方脉冲的情况。电荷场耦合中的扰动扩展表明，在中间强度，需要许多订单才能正确捕获MID-IR峰的结构。通过使经典结果正规化，可以表明MID-IR峰是由于平面波浪对脉冲包膜的影响。最后，可以证明可以使用能量，角度和极化过滤器分离中IR峰。
Nonlinear Compton scattering is calculated for the collision of an electron with a plane wave pulse. A mid infra-red (IR) peak arises in the photon spectrum due to long-range interference associated with the pulse envelope. The case of a flat-top pulse is studied as a toy model for pulse envelope effects and reduced to two final-state momentum integrations; the case of a sine-squared pulse is studied numerically. A perturbative expansion in charge-field coupling reveals that already at intermediate intensities, many orders are required to correctly capture the structure of the mid-IR peak. By regularising the classical result, it is shown that the mid-IR peak is due to plane-wave ponderomotive effects on the pulse envelope. Finally, it is shown that the mid-IR peak can be isolated using energy, angle and polarisation filters.
