Chirped Cosh-Gaussian Electron Acceleration in Vacuum Due to Two Lasers

The effects of two parallel Cosh-Gaussian laser beat waves on electron acceleration in vacuum have been investigated. By using a Cosh-Gaussian (ChG) laser instead of a Gaussian laser, we can achieve higher electron energies. To verify how laser intensities and other parameters affect electron energy, we have also examined the impact of frequency chirp for effective electron acceleration. ChG lasers are excellent for electron acceleration in vacuum due to their special characteristics, including non-diffracting behavior, controlled acceleration gradients, and minimized space charge effects. High-quality, high-energy electron beams can be produced using these lasers for a variety of purposes, such as particle physics research, imaging in medicine, and industrial uses. The electron and laser field can exchange resonant energy due to the chirp-induced phase matching condition. Depending on the chirp properties, the electron may acquire or lose energy. With the use of chirp mechanism, we can achieve more energy gain comparing to without chirp, as the presence of chirp aids in increasing the interaction period between the electron and the laser. Chirped laser pulses help to achieve phase matching between the laser field and accelerated electrons and allow precise control over the electron trajectories. Chirped pulses also help to mitigate the energy spread of the accelerated electrons. We also demonstrated interference at focus in this manuscript caused by two parallel propagated coherent lasers in the z axis, which aids in electron acceleration, resulting higher energy of electron in z-direction. The laser beam width in the transverse direction (perpendicular to the beam propagation) plays a role in focusing the laser field onto the interaction region with the electrons. The chirp and laser beam width of each laser is carefully controlled and synchronized to achieve the desired electron acceleration outcome.