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

O.J. Finlay, J.-N. Gruse, C Thornton, Ric Allott, Chris Armstrong, C.D. Baird, N. Bourgeois, Ceri M. Brenner, Silvia Cipiccia, Jason Cole, C Gregory, Steven Jamison, Y. Katzir, N.C. Lopes, S.P.D. Mangles, C.D. Murphy, Z. Najmudin, David Neely, Laura Rhian Pickard, Kevin D PotterP.P. Rajeev, Dean R. Rusby, MP Selwood, D.R. Symes, C.I.D. Underwood, J.C. Wood, A G R Thomas, M.J.V. Streeter

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Abstract

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 $6^{+1.2}_{-0.9} \times 10^{\, 9}$. 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
JournalPlasma Physics and Controlled Fusion
Volume63
Issue number8
Early online date13 Jul 2021
DOIs
Publication statusPublished - Aug 2021

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© 2021 The Author(s). Published by IOP Publishing Ltd.

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