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

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, C. Gregory, S. Jamison, Y. Katzir, N. C. Lopes, S. P.D. Mangles, C. D. Murphy, Z. Najmudin, D. Neely, L. R. Pickard, K. D. PotterP. P. Rajeev, D. Rusby, M. P. Selwood, D. R. Symes, C. I.D. Underwood, J. C. Wood, A. G.R. Thomas, M. J.V. Streeter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number084010
Number of pages7
JournalPlasma Physics and Controlled Fusion
Issue number8
Early online date13 Jul 2021
Publication statusPublished - 1 Aug 2021

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