title: Emittance measurements of a laser-wakefield-accelerated electron beam.
abstract: The transverse emittance of a relativistic electron beam generated by the interaction of a high-intensity laser with an underdense plasma has been measured with the "pepper-pot" method. For parameters pertaining to the forced laser wakefield regime, we have measured an emittance as low as (2.7+/-0.9) pi mm mrad for (55+/-2) MeV electrons. These measurements are consistent with 3D particle-in-cell simulations of the experiment, which additionally show the existence of a relatively large halo around the beam core.
authors.affiliation: Laboratoire d'Optique Appliquée-ENSTA, UMR 7639, CNRS, Ecole Polytechnique, 91761 Palaiseau, France.
authors.forename: S
authors.initials: S
authors.lastname: Fritzler
authors.forename: E
authors.initials: E
authors.lastname: Lefebvre
authors.forename: V
authors.initials: V
authors.lastname: Malka
authors.forename: F
authors.initials: F
authors.lastname: Burgy
authors.forename: A E
authors.initials: AE
authors.lastname: Dangor
authors.forename: K
authors.initials: K
authors.lastname: Krushelnick
authors.forename: S P D
authors.initials: SP
authors.lastname: Mangles
authors.forename: Z
authors.initials: Z
authors.lastname: Najmudin
authors.forename: J-P
authors.initials: JP
authors.lastname: Rousseau
authors.forename: B
authors.initials: B
authors.lastname: Walton