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From the same journal

Characterisation of a laser plasma betatron source for high resolution x-ray imaging

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  • O. J. Finlay
  • J. N. Gruse
  • C. Thornton
  • R. Allott
  • C. D. Armstrong
  • C. D. Baird
  • N. Bourgeois
  • C. Brenner
  • S. Cipiccia
  • J. M. Cole
  • S. Jamison
  • Y. Katzir
  • N. C. Lopes
  • S. P.D. Mangles
  • Z. Najmudin
  • D. Neely
  • L. R. Pickard
  • K. D. Potter
  • P. P. Rajeev
  • D. Rusby
  • D. R. Symes
  • C. I.D. Underwood
  • J. C. Wood
  • A. G.R. Thomas
  • M. J.V. Streeter


Publication details

JournalPlasma Physics and Controlled Fusion
DateAccepted/In press - 29 Jun 2021
DateE-pub ahead of print - 13 Jul 2021
DatePublished (current) - 1 Aug 2021
Issue number8
Number of pages7
Early online date13/07/21
Original languageEnglish


We report on the characterisation of an x-ray source, generated by a laser-driven plasma wakefield accelerator. The spectrum 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× 10\9. 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.

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© 2021 The Author(s)

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