Emittance measurements of a laser-wakefield-accelerated electron beam.
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.
Fritzler
S
S
Laboratoire d'Optique Appliquée-ENSTA, UMR 7639, CNRS, Ecole Polytechnique, 91761 Palaiseau, France.
Lefebvre
E
E
Malka
V
V
Burgy
F
F
Dangor
A E
AE
Krushelnick
K
K
Mangles
S P D
SP
Najmudin
Z
Z
Rousseau
J-P
JP
Walton
B
B