Spatiotemporal correction of ultrashort electron beam with radially polarized laser

Abstract

The manipulation of ultrashort electron beams, particularly in the sub-femtosecond range, faces significant challenges due to the spherical aberration and temporal distortion caused by magnetic components during the beam’s generation and transport. These challenges critically affect the spatial and temporal distribution of the beams, limiting their potential for further applications. In this paper, we propose a novel optical correction method that uses a focused radially polarized laser to simultaneously correct both spherical aberration and temporal distortion. Under the assumption of no space charge effects, simulation results present remarkable improvements, with a 65.3% reduction in transverse beam size, a 48.5% reduction in transverse normalized emittance, and an effective mitigation of temporal distortion. These improvements in beam quality provide unprecedented opportunities for the spatiotemporal manipulation of ultrashort electron beams and their broader applications.