Near-Ideal Dechirper for Plasma-Based Electron and Positron Acceleration Using a Hollow Channel Plasma

Abstract

Plasma-based electron/positron wakefield acceleration has made great strides in the past decade. Currently, a major challenge to its application in coherent light sources and linear colliders is the relatively large beam-energy spread, dominated by the energy chirp. The authors propose a nearly ideal dechirper based on a low-density hollow channel plasma to reduce the beam energy spread down to the 0.1% level or even lower, while maintaining beam emittance. This approach may significantly improve the beam quality of plasma-based accelerators, paving the way for compact free-electron lasers and colliders.