Electron acceleration and electron-photon collision by multi-PW lasers for extreme field science

We present the energy scaling of electrons accelerated via laser-wakefield acceleration driven by multi-10-PW laser systems. We show that with 25 PW (5 kJ) laser pulse, electrons can be accelerated up to 500 GeV over the distance of 100 m. Upon collision with counter-propagating 25 PW laser, strong-field QED limits can be approached.