Characterization of transverse beam emittance of electrons from a laser-plasma wakefield accelerator in the bubble regime using betatron x-ray radiation

Abstract : We propose and use a technique to measure the transverse emittance of a laser-wakefield accelerated beam of relativistic electrons. The technique is based on the simultaneous measurements of the electron beam divergence given by v(perpendicular to)/v(parallel to), the measured spectrum gamma, and the transverse electron bunch size in the bubble r(perpendicular to). The latter is obtained via the measurement of the source size of the x rays emitted by the accelerating electron bunch in the bubble. We measure a normalized rms beam transverse emittance < 0.5 pi mm mrad as an upper limit for a spatially Gaussian, spectrally quasimonoenergetic electron beam with 230 MeV energy in agreement with numerical modeling and analytic theory in the bubble regime.
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Physical Review Special Topics - Accelerators and Beams, 2012, 15 (2), 〈10.1103/PhysRevSTAB.15.021302〉
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Contributeur : Pierre Zaparucha <>
Soumis le : mercredi 23 novembre 2016 - 14:20:24
Dernière modification le : jeudi 10 mai 2018 - 02:06:12

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S. Kneip, C. Mcguffey, J. Martins, S. Bloom, V. Chvykov, et al.. Characterization of transverse beam emittance of electrons from a laser-plasma wakefield accelerator in the bubble regime using betatron x-ray radiation. Physical Review Special Topics - Accelerators and Beams, 2012, 15 (2), 〈10.1103/PhysRevSTAB.15.021302〉. 〈hal-01401477〉

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