Publications associated with Oxford Centre for High Energy Density Science (OxCHEDS)

Energy absorption in the laser-QED regime

Scientific Reports Springer Nature 9 (2019) 8956

A Savin, A Ross, R Aboushelbaya, M Mayr, B Spiers, R Wang, P Norreys

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.

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