The proposed project is focused on particle acceleration and radiation generation in laser-produced plasmas, which is a strongly nonlinear process and requires a kinetic description. Therefore, for a high physics fidelity, first-principles modelling high performance computing is necessary. The project will be focused on generation of attosecond electron pulses, and modelling of ionization and collisions in high-density plasmas. This medium storage application is connected with the SNIC 2021/5-460 project.