Developing a high-flux, high-energy continuum backlighter for extended x-ray absorption fine structure measurements at the National Ignition Facility

A Krygier; F Coppari; G E Kemp; D B Thorn; R S Craxton; J H Eggert; E M Garcia; J M McNaney; H-S Park; Y Ping; B A Remington; M B Schneider

doi:10.1063/1.5038669

Developing a high-flux, high-energy continuum backlighter for extended x-ray absorption fine structure measurements at the National Ignition Facility

Rev Sci Instrum. 2018 Oct;89(10):10F114. doi: 10.1063/1.5038669.

Authors

A Krygier¹, F Coppari¹, G E Kemp¹, D B Thorn¹, R S Craxton², J H Eggert¹, E M Garcia², J M McNaney¹, H-S Park¹, Y Ping¹, B A Remington¹, M B Schneider¹

Affiliations

¹ Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, California 94550, USA.
² Laboratory for Laser Energetics, University of Rochester, 250 E. River Rd., Rochester, New York 14623-1299, USA.

PMID: 30399955
DOI: 10.1063/1.5038669

Abstract

Extended X-ray absorption fine structure (EXAFS) spectroscopy is a powerful tool for in situ characterization of matter in the high energy density regime. An EXAFS platform is currently being developed on the National Ignition Facility. Development of a suitable X-ray backlighter involves minimizing the temporal duration and source size while maximizing spectral smoothness and brightness. One approach involves imploding a spherical shell, which generates a high-flux X-ray flash at stagnation. We present results from a series of experiments comparing the X-ray source properties produced by imploded empty and Ar-filled capsules.