Abstract
In this work, we perform particle-in-cell simulations to investigate the electron bunch quality using a chirped laser pulse in a laser wakefield acceleration mechanism. Particular attention is devoted to the electron beam quality improvement using a chirped laser pulse through group delay dispersion. By adjusting the value of group delay dispersion, the electron beam quality was controlled and improved in the range: charge (31--325 pC), energy (240--485 MeV), energy spread (2.1%--12.5%), and bunch duration (3.3--17 fs). The electron bunch charge highly depends on the chirping of the laser pulse. We anticipate that the ultrashort sub-GeV electron bunch generated in the laser wakefield acceleration mechanism using chirped laser pulses may be crucial in developing free-electron laser-based compact radiation sources.
Highlights
Over the past several decades, laser wakefield acceleration (LWFA) [1] has attracted extensive attention and has been the subject of intense investigation due to its potential applications in soft x-ray/gamma-ray source development [2,3]
The LWFAs are becoming a promising option for a wide range of applications such as free-electron lasers (FELs) [8,9,10] or future linear colliders [11], which would strongly benefit from reduced size and cost
With the growth of the injected electron bunch charge, the self-fields of the injected bunch become more important, which change the structure of the accelerating field, and LWFA begins to operate in the beam loading regime [26,27,28]
Summary
We perform particle-in-cell simulations to investigate the electron bunch quality using a chirped laser pulse in a laser wakefield acceleration mechanism. Particular attention is devoted to the electron beam quality improvement using a chirped laser pulse through group delay dispersion. By adjusting the value of group delay dispersion, the electron beam quality was controlled and improved in the range: charge (31–325 pC), energy (240–485 MeV), energy spread (2.1%–12.5%), and bunch duration (3.3–17 fs). The electron bunch charge highly depends on the chirping of the laser pulse. We anticipate that the ultrashort sub-GeV electron bunch generated in the laser wakefield acceleration mechanism using chirped laser pulses may be crucial in developing free-electron laser-based compact radiation sources
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