Enhancing vacuum beat wave electron acceleration through the synergistic action of two chirped, tightly focused LP laser pulses

Laser-driven plasma accelerators have attracted attention for their ability to achieve ultra-high gradient acceleration and produce high-quality particle beams. Vacuum-based laser acceleration offers advantages over plasma mediums by eliminating instabilities associated with plasma interactions. This study investigates electron acceleration dynamics using two tightly focused, linearly polarized laser beams with controlled frequency chirp in vacuum. The research aims to optimize parameters for electron energy gain, emphasizing the significance of periodic frequency chirp in enhancing acceleration efficiency. Mathematical analyses elucidate the interaction mechanisms between electrons and tightly focused laser beat waves. Results demonstrate substantial energy gains in the MeV range, with insights into the influence of laser intensity, chirp parameter, and initial phase angle on electron acceleration. The study highlights the importance of precise parameter optimization for maximizing electron energy gain in vacuum-based beat wave acceleration, contributing valuable insights to particle physics and materials science advancements.