title: Tomography of injection and acceleration of monoenergetic electrons in a laser-wakefield accelerator.
abstract: A tomographic diagnosis method was developed to systematically resolve the injection and acceleration processes of a monoenergetic electron beam in a laser-wakefield accelerator. It was found that all the monoenergetic electrons are injected at the same location in the plasma column and accelerated from 5 to 55 MeV energy in 200 microm distance. This is a direct measurement of the real acceleration gradient in a laser-wakefield accelerator, and the experimental data are consistent with the model of transverse wave breaking and beam loading for monoenergetic electron injection.
authors.affiliation: Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan.
authors.forename: C-T
authors.initials: CT
authors.lastname: Hsieh
authors.forename: C-M
authors.initials: CM
authors.lastname: Huang
authors.forename: C-L
authors.initials: CL
authors.lastname: Chang
authors.forename: Y-C
authors.initials: YC
authors.lastname: Ho
authors.forename: Y-S
authors.initials: YS
authors.lastname: Chen
authors.forename: J-Y
authors.initials: JY
authors.lastname: Lin
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: S-Y
authors.initials: SY
authors.lastname: Chen