paper

Optimized multibeam configuration for observation of QED cascades

arXiv:1505.06680 · doi:10.1103/PhysRevA.92.022113

Abstract

QED cascades in intense electromagnetic field can occur if the dynamical quantum parameter of a seed electron, which in Compton units coincides with the electron proper acceleration, attains the order of unity. We derive general expression for of an initially slow electron in an arbitrary electromagnetic field for a time range , where is the field carrier frequency. Using this formula, we consider a special field configuration of multiple colliding focused laser beams and optimize it to provide cascade development at laser power below PW and intensity of the order of W/cm. Such parameters of the beams will be obtained with a new generation of laser facilities, particularly the ELI Beamlines, in the coming years.

5 pages, 6 figures

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