High-energy gamma-ray beams from nonlinear Thomson and Compton scattering in the ultra-intense regime

Abstract

We consider the Thomson and Compton scattering of high-energy electrons in an intense laser pulse. Our simulations show that energy losses due to radiation reaction cause the emitted radiation to be spread over a broader angular range than the case without these losses included. We explain this in terms of the effect of these energy losses on the particle dynamics. Finally, at ultra-high intensities, i.e. fields with a dimensionless parameter a 0~2 00, the energy of the emission spectrum is significantly reduced by radiation reaction and also the classical and QED results begin to differ. This is found to be due to the classical theory overestimating the energy loss of the electrons. Such findings are relevant to radiation source development involving the next generation of high-intensity laser facilities.

Generation of high-energy electron-positron pairs in the collision of a laser-accelerated electron beam with a multipetawatt laser

“…An all-optical scheme, based on a laser wakefield accelerator (LWFA) instead of a conventional accelerator, should be within the reach of multi-PW, multi-beam laser systems. As a first step, consistently with theoretical predictions [26][27][28][29][30], recent state-of-the-art experiments have confirmed the potential of this configuration for generating high-brilliance γray photon beams [31]. In order to provide guidelines for future experiments, we present in this Letter the first integrated, one-to-one simulation study of the pair production expected on the upcoming multi-PW laser facilities.…”