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Description
Electron acceleration driven by laser wakefield using a laser pulse with circular polarization is studied with the objective to generate high-quality electron bunches with narrow energy spread and small emittance. In order to inject electrons into the accelerating phase of the plasma wave, a density transition shaped as bump is employed. Using particle-in-cell simulations, we demonstrate the influence of laser polarization on the quality of electron bunches. Simulation results, using experimentally achievable parameters, show that electron bunches with an energy spread of $ \sim 2.6\ \%$ are obtained for the circular polarization as compared to $ \sim 9.3\ \%$ energy spread for the linear polarization in a mm-scale length plasma. The results show an improved quality electron bunch generation from laser wakefield acceleration. The predicted electron bunch quality may be crucial in developing plasma based electromagnetic radiation sources.
