Optimal parameters for radiation reaction experiments
Optimal parameters for radiation reaction experiments
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DOI：
10.1088/1361-6587/ab20f6
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发表时间：
2019-07-01
影响因子：
2.2
通讯作者：
Ridgers, C. P.
中科院分区：
文献类型：
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作者：
Arran, C.;Cole, J. M.;Ridgers, C. P.
随着强度在10(22)-10(24)wcm（-2）的新型激光设备的开发，理解强场量子电动力学过程的影响变得越来越重要，例如量子辐射反应，它将在这些强度下的激光等离子体相互作用中起主导作用。最近的全光学实验中，来自激光尾场加速器的GeV电子遇到了(0)bbb10的反向传播激光脉冲，已经产生了辐射反应的证据，但还没有最终确定量子效应，也没有最合适的理论描述。在这里，我们展示了碰撞的数量和实现这一目标所需的条件，基于在现实条件下辐射反应实验的模拟活动。我们得出结论，虽然光子光谱的临界能量区分经典和量子修正模型，但区分随机和确定性量子模型的更好方法是电子能量传播的变化。这对弹间的波动是稳健的，必要的激光强度和电子束能量已经可用。例如，我们表明，只要电子能量扩散低于25%，在a(0) = 10的碰撞中，电子能量为500 MeV，就可以在30次以内区分不同的量子模型，即使在50%的水平上发生不同的变化。
As new laser facilities are developed with intensities on the scale of 10(22)-10(24) W cm(-2), it becomes ever more important to understand the effect of strong field quantum electrodynamic processes, such as quantum radiation reaction, which will play a dominant role in laser-plasma interactions at these intensities. Recent all-optical experiments, where GeV electrons from a laser wakefield accelerator encountered a counter-propagating laser pulse with a(0) > 10, have produced evidence of radiation reaction, but have not conclusively identified quantum effects nor their most suitable theoretical description. Here we show the number of collisions and the conditions required to accomplish this, based on a simulation campaign of radiation reaction experiments under realistic conditions. We conclude that while the critical energy of the photon spectrum distinguishes classical and quantum-corrected models, a better means of distinguishing the stochastic and deterministic quantum models is the change in the electron energy spread. This is robust against shot-to-shot fluctuations and the necessary laser intensity and electron beam energies are already available. For example, we show that so long as the electron energy spread is below 25%, collisions at a(0) = 10 with electron energies of 500 MeV could differentiate between different quantum models in under 30 shots, even with shot-to-shot variations at the 50% level.