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X-ray powder diffraction in reflection geometry on multi-beam kJ-type laser facilities

Abstract : An ultrafast x-ray powder diffraction setup for laser-driven dynamic compression has been developed at the LULI2000 laser facility. X-ray diffraction is performed in reflection geometry from a quasi-monochromatic laser-generated plasma x-ray source. In comparison to a transmission geometry setup, this configuration allows us to probe only a small portion of the compressed sample, as well as to shield the detectors against the x-rays generated by the laser-plasma interaction on the front side of the target. Thus, this new platform facilitates probing of spatially and temporarily uniform thermodynamic conditions and enables us to study samples of a large range of atomic numbers, thicknesses, and compression dynamics. As a proof-of-concept, we report direct structural measurements of the bcc-hcp transition both in shock and ramp-compressed polycrystalline iron with diffraction signals recorded between 2θ ∼30° and ∼150°. In parallel, the pressure and temperature history of probed samples is measured by rear-side visible diagnostics (velocimetry and pyrometry).
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Contributor : Laurent Jonchère <>
Submitted on : Monday, March 8, 2021 - 11:33:57 AM
Last modification on : Wednesday, March 31, 2021 - 4:45:33 PM


Denoeud et al - 2021 - X-ray p...
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A. Denoeud, J.-A. Hernandez, T. Vinci, Benuzzi-Mounaix A., S. Brygoo, et al.. X-ray powder diffraction in reflection geometry on multi-beam kJ-type laser facilities. Review of Scientific Instruments, American Institute of Physics, 2021, 92 (1), pp.013902. ⟨10.1063/5.0020261⟩. ⟨hal-03130289⟩



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