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Characterisation of a Laser Plasma Betatron Source for High Resolution X-ray Imaging

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  • J-N Gruse
  • C Thornton
  • R Allott
  • C Armstrong
  • C.D. Baird
  • N Bourgeois
  • C Brenner
  • S Cipiccia
  • J.M. Cole
  • C. Gregory
  • Y. Katzir
  • N.C. Lopes
  • S.P.D. Mangles
  • C.D. Murphy
  • Z. Najmudin
  • D. Neely
  • L.R. Pickard
  • K.D. Potter
  • P.P. Rajeev
  • D. Rusby
  • D.R. Symes
  • C.I.D. Underwood
Article number084010
<mark>Journal publication date</mark>31/08/2021
<mark>Journal</mark>Plasma Physics and Controlled Fusion
Issue number8
Publication StatusPublished
Early online date29/06/21
<mark>Original language</mark>English


We report on the characterisation of an x-ray source, generated by a laser-driven plasma wakefield accelerator. The spectra of the optimised source was consistent with an on-axis synchrotron spectrum with a critical energy of 13.8+2.2-1.9 keV and the number of photons per pulse generated above 1 keV was calculated to be 6+1.2-0.9 × 109. The x-ray beam was used to image a resolution grid placed 37 cm from the source, which gave a measured spatial resolution of 4 μm × 5 μm. The inferred emission region had a radius and length of 0.5 ± 0.2 μm and 3.2 ± 0.9 mm respectively. It was also observed that laser damage to the exit aperture of the gas cell led to a reduction in the accelerated electron beam charge and a corresponding reduction in x-ray flux due to the change in the plasma density profile.