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Ultrahigh Brilliance Multi-MeV gamma-Ray Beams from Nonlinear Relativistic Thomson Scattering

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  • G. Sarri
  • D. J. Corvan
  • W. Schumaker
  • J. M. Cole
  • A. Di Piazza
  • H. Ahmed
  • C. Harvey
  • C. H. Keitel
  • K. Krushelnick
  • S. P. D. Mangles
  • Z. Najmudin
  • D. Symes
  • A. G. R. Thomas
  • M. Yeung
  • Z. Zhao
  • M. Zepf
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Article number224801
<mark>Journal publication date</mark>25/11/2014
<mark>Journal</mark>Physical Review Letters
Issue number22
Volume113
Number of pages5
<mark>State</mark>Published
<mark>Original language</mark>English

Abstract

We report on the generation of a narrow divergence (theta(gamma) <2.5 mrad), multi-MeV (E-max approximate to 18 MeV) and ultrahigh peak brilliance (> 1.8 x 10(20) photons s(-1) mm(-2) mrad(-2) 0.1% BW) gamma-ray beam from the scattering of an ultrarelativistic laser-wakefield accelerated electron beam in the field of a relativistically intense laser (dimensionless amplitude a(0) approximate to 2). The spectrum of the generated gamma- ray beam is measured, with MeV resolution, seamlessly from 6 to 18 MeV, giving clear evidence of the onset of nonlinear relativistic Thomson scattering. To the best of our knowledge, this photon source has the highest peak brilliance in the multi-MeV regime ever reported in the literature.