title: Compensating the electron beam energy spread by the natural transverse gradient of laser undulator in all-optical x-ray light sources.
abstract: All-optical ideas provide a potential to dramatically cut off the size and cost of x-ray light sources to the university-laboratory scale, with the combination of the laser-plasma accelerator and the laser undulator. However, the large longitudinal energy spread of the electron beam from laser-plasma accelerator may hinder the way to high brightness of these all-optical light sources. In this paper, the beam energy spread effect is proposed to be significantly compensated by the natural transverse gradient of a laser undulator when properly transverse-dispersing the electron beam. Theoretical analysis and numerical simulations on conventional laser-Compton scattering sources and high-gain all-optical x-ray free-electron lasers with the electron beams from laser-plasma accelerators are presented.
authors.forename: Tong
authors.initials: T
authors.lastname: Zhang
authors.forename: Chao
authors.initials: C
authors.lastname: Feng
authors.forename: Haixiao
authors.initials: H
authors.lastname: Deng
authors.forename: Dong
authors.initials: D
authors.lastname: Wang
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Dai
authors.forename: Zhentang
authors.initials: Z
authors.lastname: Zhao