Photon spectrum and polarization for high conversion coefficient in the Compton backscattering process

This study looks to simulate the nonlinear Compton backscattering (CBS) process based on the Monte Carlo technique for the conversion coefficient Kc⩾1, which can be considered as the average number of photons emitted by each electron. The characteristics of the nonlinear CBS process simulated in this work are as follows: the number of absorbed photons of a laser, the distance in the laser pulse in which the electron passes between two collisions, the energy and the polarization of the emitted photon in each collision, and the polarization of the electron before and after collision. The developed approach allows us to find the spectra and polarization characteristics of the final electrons and photons. When Kc>1, the spin-flip processes need to be considered for a correct simulation of the polarization of the final photons and electrons for energies typical of a γ-γ collider.