2025/08/21 by Serebryakov, M. A., Nerush, E. N., Ji, L. +2
#Computational Physics (physics.comp-ph) #FOS: Physical sciences #Plasma Physics (physics.plasm-ph)
paper · doi:10.48550/arxiv.2508.15984
The self-sustained or avalanche-type cascade is an intriguing prediction of strong-field quantum electrodynamics (QED) that has yet to be observed in laboratories. It is accompanied by the conversion of electromagnetic energy into gamma photons and electron-positron (e-e+) pairs, whose number increases exponentially over time. We investigate a simple configuration to initiate a QED cascades: it is based on the superposition of an incident multipetawatt laser pulse and its reflection from a solid target. The incident laser pulse <> the initially flat target surface, creating a parabolic mirror that focuses the reflected radiation. For the considered setup the threshold laser power is about 7 PW. With a 27 PW laser pulse, positron production exhibits clear signatures of an avalanche-type cascade, including exponential growth and more than 15 positron generations with similar energy spectra. Therefore, observing an avalanche-type QED cascade does not require the use of multiple laser channels with precise spatio-temporal synchronization, as previously supposed.