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