Low emittance, high brilliance relativistic electron beams from a laser-plasma accelerator |
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Authors: | Brunetti E Shanks R P Manahan G G Islam M R Ersfeld B Anania M P Cipiccia S Issac R C Raj G Vieux G Welsh G H Wiggins S M Jaroszynski D A |
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Institution: | Physics Department, University of Strathclyde, Glasgow G4 0NG, United Kingdom. |
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Abstract: | Progress in laser wakefield accelerators indicates their suitability as a driver of compact free-electron lasers (FELs). High brightness is defined by the normalized transverse emittance, which should be less than 1π mm mrad for an x-ray FEL. We report high-resolution measurements of the emittance of 125 MeV, monoenergetic beams from a wakefield accelerator. An emittance as low as 1.1±0.1π mm mrad is measured using a pepper-pot mask. This sets an upper limit on the emittance, which is comparable with conventional linear accelerators. A peak transverse brightness of 5×101? A m?1 rad?1 makes it suitable for compact XUV FELs. |
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