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Low emittance, high brilliance relativistic electron beams from a laser-plasma accelerator

Brunetti, E. and Shanks, Richard and Manahan, G. G. and Islam, M. R. and Ersfeld, B. and Anania, M. P. and Cipiccia, S. and Issac, R. C. and Raj, G. and Vieux, G. and Welsh, G. H. and Wiggins, S. M. and Jaroszynski, D. A. (2010) Low emittance, high brilliance relativistic electron beams from a laser-plasma accelerator. Physical Review Letters, 105 (21). ISSN 0031-9007

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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 1 pi 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 +/- 0.1 pi 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 x 10(15) Am-1 rad(-1) makes it suitable for compact XUV FELs.