research project, as it combines two high power laser systems as well as the necessary rf infrastructure. With the availability of a petawatt-class laser system and a large complete conventional accelerator, [...] the necessary knowledge on target fabrication, laser-driven ion acceleration, high-intensity laser systems, accelerator technology, and pulsed magnetic field design. In 2018, two more partners have joined [...] the pre-plasma on the target front side generated by amplified spontaneous emission of the laser system (a). The main pulse interacts with the plasma at the critical surface and accelerates hot electrons