Radiative Effect on Particle Acceleration via Relativistic Electromagnetic Expansion

The radiation damping effect on the diamagnetic relativistic pulse accelerator (DRPA) is studied in two-and-half dimensional Particle-in-Cell (PIC) simulation with magnetized electron-positron plasmas. Self-consistently solved radiation damping force converts particle energy to radiation energy. The DRPA is still robust with radiation, and the Lorentz factor of the most high energy particles reach more than two thousand before they decouple from the electromagnetic pulse. Resulted emitted power from the pulse front is lower in the radiative case than the estimation from the non-radiative case due to the radiation damping. The emitted radiation is strongly linearly polarized and peaked within few degrees from the direction of Poynting flux.