Towards performing high-resolution inelastic X-ray scattering measurements at hard X-ray free-electron lasers coupled with energetic laser drivers

open access.

Bibliographische Detailangaben
Veröffentlicht in:	Journal of synchrotron radiation. - 1994. - 29(2022), Pt 4 vom: 01. Juli, Seite 931-938
1. Verfasser:	Descamps, A (VerfasserIn)
Weitere Verfasser:	Ofori-Okai, B K, Baldwin, J K, Chen, Z, Fletcher, L B, Glenzer, S H, Hartley, N J, Hasting, J B, Khaghani, D, Mo, M, Nagler, B, Recoules, V, Redmer, R, Schörner, M, Sun, P, Wang, Y Q, White, T G, McBride, E E
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2022
Zugriff auf das übergeordnete Werk:	Journal of synchrotron radiation
Schlagworte:	Journal Article XFEL extreme conditions high-resolution inelastic X-ray scattering thermal diffuse scattering

Beschreibung
Zusammenfassung:	open access. High-resolution inelastic X-ray scattering is an established technique in the synchrotron community, used to investigate collective low-frequency responses of materials. When fielded at hard X-ray free-electron lasers (XFELs) and combined with high-intensity laser drivers, it becomes a promising technique for investigating matter at high temperatures and high pressures. This technique gives access to important thermodynamic properties of matter at extreme conditions, such as temperature, material sound speed, and viscosity. The successful realization of this method requires the acquisition of many identical laser-pump/X-ray-probe shots, allowing the collection of a sufficient number of photons necessary to perform quantitative analyses. Here, a 2.5-fold improvement in the energy resolution of the instrument relative to previous works at the Matter in Extreme Conditions (MEC) endstation, Linac Coherent Light Source (LCLS), and the High Energy Density (HED) instrument, European XFEL, is presented. Some aspects of the experimental design that are essential for improving the number of photons detected in each X-ray shot, making such measurements feasible, are discussed. A careful choice of the energy resolution, the X-ray beam mode provided by the XFEL, and the position of the analysers used in such experiments can provide a more than ten-fold improvement in the photometrics. The discussion is supported by experimental data on 10 µm-thick iron and 50 nm-thick gold samples collected at the MEC endstation at the LCLS, and by complementary ray-tracing simulations coupled with thermal diffuse scattering calculations
Beschreibung:	Date Revised 31.08.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE
ISSN:	1600-5775
DOI:	10.1107/S1600577522004453