The multi-optics high-resolution absorption x-ray spectrometer (HiRAXS) for studies of materials under extreme conditions

S Stoupin; D B Thorn; N Ose; L Gao; K W Hill; Y Ping; F Coppari; B Kozioziemski; A Krygier; H Sio; J Ayers; M Bitter; B Kraus; P C Efthimion; M B Schneider

doi:10.1063/5.0043685

The multi-optics high-resolution absorption x-ray spectrometer (HiRAXS) for studies of materials under extreme conditions

Rev Sci Instrum. 2021 May 1;92(5):053102. doi: 10.1063/5.0043685.

Authors

S Stoupin¹, D B Thorn¹, N Ose¹, L Gao², K W Hill², Y Ping¹, F Coppari¹, B Kozioziemski¹, A Krygier¹, H Sio¹, J Ayers¹, M Bitter², B Kraus², P C Efthimion², M B Schneider¹

Affiliations

¹ Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
² Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.

PMID: 34243250
DOI: 10.1063/5.0043685

Abstract

We report the development of a high-resolution spectrometer for extended x-ray absorption fine structure (EXAFS) studies of materials under extreme conditions. A curved crystal and detector in the spectrometer are replaceable such that a single body is employed to perform EXAFS measurements at different x-ray energy intervals of interest. Two configurations have been implemented using toroidal crystals with Ge 311 reflection set to provide EXAFS at the Cu K-edge (energy range 8.9-9.8 keV) and Ge 400 reflection set to provide EXAFS at the Ta L3-edge (9.8-10.7 keV). Key performance characteristics of the spectrometer were found to be consistent with design parameters. The data generated at the National Ignition Facility have shown an ≃3 eV spectral resolution for the Cu K-edge configuration and ≃6 eV for the Ta L3-edge configuration.