Polarization properties of laser Compton slant scattering gamma beam at SLEGS

Abstract: A Monte Carlo simulation code and an analytical calculation code for polarization study were developed at Shanghai Laser Gamma Source (SLEGS), employing the unique laser Compton slant scattering (LCSS) mode. The intensity of spatial distributions and its Stokes parameters are simulated for LCSS of linearly/circularly polarized laser photons and unpolarized relativistic electrons. The polarization degree of the incident photon is almost completely transferred to the scattered gamma rays for arbitrary incident angle. For a linearly polarized laser incident in a fixed direction, the direction of polarization of the scattered gamma-ray changes with the scattering angle. The measured polarization direction and size of the scattered gamma spatial distribution are in general agreement with the simulation in the linearly polarized laser case.