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arXiv 1901.09015physics.plasm-ph
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辐射反应实验的最佳参数

Optimal Parameters for Radiation Reaction Experiments

Christopher Arran, Jason M. Cole, Elias Gerstmayr, Tom G. Blackburn, Stuart P. D. Mangles, Christopher P. Ridgers

摘要:

随着新的激光设备的发展,其强度达到10^22 ~ 10^24 W·cm^-2,理解强场量子电动力学过程(如量子辐射反应)的影响变得越来越重要,因为在这些强度下,强场量子电动力学过程将在激光-等离子体相互作用中发挥主导作用。最近的全光学实验,其中GeV电子从激光尾场加速器遇到一个反向传播的激光脉冲与a_0 > 10,产生的辐射反应的证据,但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,基于现实条件下的辐射反应实验的模拟活动。我们的结论是,虽然光子谱的临界能量区分经典和量子校正模型,区分随机和确定性量子模型的一个更好的手段是在电子能量扩散的变化。这是强大的打击到射击波动和必要的激光强度和电子束能量已经可用。例如,我们表明,只要电子能量分布低于25%,在a_0 = 10与电子能量为500 MeV的碰撞可以区分不同的量子模型在30下的镜头,即使镜头到镜头的变化在50%的水平。

英文摘要:

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 electrodynamics 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.

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