In the regime of Quantum Electricdynamics (QED), relativistic electrons collide with an ultra-intense laser pulse can generate high-energy gamma-rays by nonlinear Compton scattering. All-optical nonlinear Compton scattering regime have been analysed by using different laser-plasma acceleration schemes in past decades. However, since the process involves electron acceleration, non-linear Compton scattering and radiation reaction, et al, the effect of key parameters on nonlinear Compton scattering and B-W process are difficult to describe. We analysed the ideal relativistic electron bunch colliding with an ultra-intense laser in different incident angles, shapes of laser pulses, laser intensities and electron bunch lengths. Simulation results show that the spectra of emitted photons and positron are similar for different parameters, which is due to the broad spectra of electrons after collision with laser field. However, the yields of photon and positron vary for different cases. With the increase of the incident angle, the yields decrease dramatically when it is greater than 20 degree. The delayed location of laser peak field can increase the number of photons and positron generated. The laser intensity, which dominates the photon emissions, can increase the yields of photons and positron when using a higher intensity laser to interact with electron bunch. By tuning the length of electron bunch, while keeping the electron charge constant, we find that both the electron density and bunch length are important to photons emission.
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|Working group||Secondary radiation generation & applications|