Plasma-based accelerators offer the possibility to drive future compact light sources and high-energy physics applications. Achieving good beam quality, especially a small beam energy spread, is still one of the major challenges. Here, we propose to use a periodically modulated plasma density to shape the longitudinal fields acting on an electron bunch in the linear wakefield regime. With simulations, we demonstrate an on-average flat accelerating field that maintains a small beam energy spread.
Brinkmann, R., Delbos, N., Dornmair, I., Kirchen, M., Assmann, R., Behrens, C., … Maier, A. R. (2017). Chirp Mitigation of Plasma-Accelerated Beams by a Modulated Plasma Density. Physical Review Letters, 118(21). https://doi.org/10.1103/PhysRevLett.118.214801