Savin Alex F, Ross Aimee J, Aboushelbaya Ramy, Mayr Marko W, Spiers Ben, Wang Robin H-W, Norreys Peter A
Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, United Kingdom.
Central Laser Facility, STFC Rutherford Appleton Laboratory, Didcot, OX11 0QX, United Kingdom.
Sci Rep. 2019 Jun 20;9(1):8956. doi: 10.1038/s41598-019-45536-x.
A theoretical and numerical investigation of non-ponderomotive absorption at laser intensities relevant to quantum electrodynamics is presented. It is predicted that there is a regime change in the dependence of fast electron energy on incident laser energy that coincides with the onset of pair production via the Breit-Wheeler process. This prediction is numerically verified via an extensive campaign of QED-inclusive particle-in-cell simulations. The dramatic nature of the power law shift leads to the conclusion that this process is a candidate for an unambiguous signature that future experiments on multi-petawatt laser facilities have truly entered the QED regime.
本文对与量子电动力学相关激光强度下的非有质动力吸收进行了理论和数值研究。据预测，快电子能量对入射激光能量的依赖关系会发生 regime 变化，这与通过 Breit-Wheeler 过程产生正负电子对的起始点相吻合。通过一系列广泛的包含量子电动力学的粒子模拟，对这一预测进行了数值验证。幂律变化的显著特性得出这样的结论：该过程是一个明确的标志候选者，未来在多拍瓦激光装置上进行实验时，这意味着真正进入了量子电动力学 regime。
