飞行聚焦脉冲中的辐射反应增强
Radiation Reaction Enhancement in Flying Focus Pulses
摘要：
辐射反应（RR）是电动力学中最古老的尚未解决的问题。除了在理论表述上的概念上的困难之外，超大电荷加速度的要求迄今为止还阻碍了其明确的实验鉴定。在这里，我们展示了如何可测量的RR效应的激光-电子相互作用可以通过使用飞行聚焦脉冲（FFPs）。通过允许焦点相对于脉冲相速度反向传播，FFP克服了传统激光高斯脉冲（GP）的固有限制，该固有限制将其焦点限制在瑞利范围内。对于一个电子最初也counterpropagating相对于脉冲相速度，一个扩展的相互作用长度与激光峰值强度实现在FFP。结果，获得了相同的RR减速因子，但是在FFP激光功率的数量级低于具有相同能量的超短GP。这使得所提出的设置比使用GPS的设置稳定得多，并且允许更准确的\emph{in situ}诊断。使用的Landau-Lifshitz运动方程，我们数值和分析表明，新兴的激光系统提供聚焦FFP的能力将允许一个清晰的实验识别RR。
英文摘要：
Radiation reaction (RR) is the oldest still-unsolved problem in electrodynamics. In addition to conceptual difficulties in its theoretical formulation, the requirement of exceedingly large charge accelerations has thus far prevented its unambiguous experimental identification. Here, we show how measurable RR effects in a laser-electron interaction can be achieved through the use of flying focus pulses (FFPs). By allowing the focus to counterpropagate with respect to the pulse phase velocity, a FFP overcomes the intrinsic limitation of a conventional laser Gaussian pulse (GP) that limits its focus to a Rayleigh range. For an electron initially also counterpropagating with respect to the pulse phase velocity, an extended interaction length with the laser peak intensity is achieved in a FFP. As a result, the same RR deceleration factors are obtained, but at FFP laser powers orders of magnitude lower than for ultrashort GPs with the same energy. This renders the proposed setup much more stable than those using GPs and allows for more accurate \emph{in situ} diagnostics. Using the Landau-Lifshitz equation of motion, we show numerically and analytically that the capability of emerging laser systems to deliver focused FFPs will allow for a clear experimental identification of RR.
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