Development of spin polarization-dependent quantum radiation reaction in Osiris QED module

The next generation of high-intensity laser facilities around the world will reach the multi-Petawatt power level. These high-intensity lasers will allow the exploration of the strong field quantum electrodynamics (QED) regime. Particle-in-cell (PIC) codes are a common way to simulate high-intensity laser-matter interactions. In PIC codes, such as the OSIRIS framework, QED effects were implemented through Monte-Carlo interaction processes to simulate strong-field QED-plasma experiments in the near future. Existing PIC+QED modules can capture plasma kinetic effects and calculate the quantum emission spectrum. However, they do not take into account the spin polarization, as the QED processes are implemented using unpolarized rates. Including the dependence of spin polarization to the existing QED module is important because it will not only change the QED emission rates, but also allow tracking how the electron or positron spin polarization evolves in the strong field QED experiment. Here, we present progress in developing the Osiris QED module to include the spin polarization dependence, including consideration of the spin-basis and Monte-Carlo emission processes.