Analysis of spatial radiation and motion features of nonlinear Thomson scattering in circularly polarized laser pulses

Within the frame of electrodynamic and nonlinear Thomson scattering, we utilize MATLAB simulation to study the motion and radiation features of a static electron irradiated by circularly polarized laser pulses. The beam waist of non-tightly focused pulses (NFP) and tightly focused pulses (TFP) are respectively 30λ_0 and 3λ_0 . It is shown that with peak amplitude increasing, the peak radiation azimuth decreases at approximately the same speed regardless of the beam-focusing conditions, whereas the motion intensity has greatly varied rising trends. We also find that the beam-focusing condition only affects the electron’s motion and radiation conditions significantly in intensive laser pulses, where irregular trajectories lead to complex radiated energy distributions in TFP. Furthermore, through investigating the shift of radiation ramifications in circularly polarized laser pulses, we gain novel insight into spatial decoupling process and the dynamic evolving trend of angular radiation.