Quantum Effects in Extreme Fields - Ultrahigh Intensity Physics at the Center for Relativistic Laser Science

At the Center for Relativistic Laser Science (CoReLS) we have recently commissioned a 4 PW laser system that can focus in various geometries, reaching peak intensities of up to 1023 W/cm2. We are establishing a broad scientific program centering on exploring quantum effects at ultrahigh intensities, the development of laser particle and photon sources and the development of the required ultrahigh intensity laser technology. I will review the status of the program, describing the laser and experimental system using examples of recent and currently planned experiments on radiation reactions, electron and ion acceleration and non-linear Compton scattering and outline future plans and opportunities for collaborations and joined experiments.