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

Finlay, Oliver and Gruse, J-N and Thornton, C and Allott, R and Armstrong, C and Baird, C.D. and Bourgeois, N and Brenner, C and Cipiccia, S and Cole, J.M. and Gregory, C. and Jamison, Steven and Katzir, Y. and Lopes, N.C. and Mangles, S.P.D. and Murphy, C.D. and Najmudin, Z. and Neely, D. and Pickard, L.R. and Potter, K.D. and Rajeev, P.P. and Rusby, D. and Symes, D.R. and Underwood, C.I.D. and Thomas, Alec and Streeter, Matthew (2021) Characterisation of a Laser Plasma Betatron Source for High Resolution X-ray Imaging. Plasma Physics and Controlled Fusion. ISSN 0741-3335

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Abstract

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.

Item Type:
Journal Article
Journal or Publication Title:
Plasma Physics and Controlled Fusion
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3104
Subjects:
ID Code:
156800
Deposited By:
Deposited On:
13 Jul 2021 12:50
Refereed?:
Yes
Published?:
Published
Last Modified:
18 Oct 2021 05:10