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An all-optical Compton source for single-exposure x-ray imaging

Abstract : All-optical Compton sources are innovative, compact devices to produce high energy femtosecond X-rays. Here we present results on a single-pulse scheme that uses a plasma mirror to reflect the drive beam of a laser plasma accelerator and to make it collide with the highly-relativistic electrons in its wake. The accelerator is operated in the self-injection regime, producing quasi-monoenergetic electron beams of around 150 MeV peak energy. Scattering with the intense femtosecond laser pulse leads to the emission of a collimated high energy photon beam. Using continuum-attenuation filters we measure significant signal content beyond 100 keV and with simulations we estimate a peak photon energy of around 500 keV. The source divergence is about 13 mrad and the pointing stability is 7 mrad. We demonstrate that the photon yield from the source is sufficiently high to illuminate a centimeter-size sample placed 90 centimeters behind the source, thus obtaining radiographs in a single shot.
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Submitted on : Friday, January 29, 2016 - 7:40:12 PM
Last modification on : Friday, December 3, 2021 - 11:34:03 AM

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Andreas Döpp, Emilien Guillaume, Cédric Thaury, Julien Gautier, Igor Andriyash, et al.. An all-optical Compton source for single-exposure x-ray imaging. Plasma Physics and Controlled Fusion, IOP Publishing, 2016, 58 (3), pp.034005. ⟨10.1088/0741-3335/58/3/034005⟩. ⟨hal-01263722⟩

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