Interaction of Electron Beams with Optimally Focused Laser Radiation in the QED Regime

Upcoming large-scale high-intensity laser facilities are about to open the opportunity to reach intensities sufficient for entering QED regimes of laser-matter interaction. These open up opportunities for producing gamma ray beams in the new range of parameters that have a potential to serve for fundamental studies in nuclear and quark-nuclear physics. In our study we analyse the capabilities of reaching the highest possible energies of photons in combination with high fluxes using the concept of colliding beams of high-energy electrons with high-intensity multiple-colliding laser pulses (MCLP). We present the analysis of several potential configurations and compare them in the context of the outlined problem. Achievable characteristics of high-energy photon beams are obtained for parameters accessible at current and upcoming laser facilities.