Foil backlighter development at the OMEGA laser facility for extended x-ray absorption fine structure experiments

Do, A.; Coppari, F.; Ping, Y.; Krygier, A.; Kemp, G. E.; Schneider, M. B.; McNaney, J. M.

doi:10.1063/5.0015313

Title: Foil backlighter development at the OMEGA laser facility for extended x-ray absorption fine structure experiments

Journal Article · Tue Aug 04 00:00:00 EDT 2020 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0015313· OSTI ID:1708986

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^[1]; McNaney, J. M. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Extended x-ray absorption fine structure (EXAFS) measurements require a bright and continuous x-ray source and a detection system with high spectral resolution to capture the modulations of the absorption coefficient above the material absorption edge. When performing EXAFS measurements under laser-driven dynamic compression, it is hence critical to optimize the backlighter x-ray emission. In this study, a series of experiments has been conducted at the OMEGA laser facility to characterize titanium (Z = 22), iron (Z = 26), germanium (Z = 32), molybdenum (Z = 42), silver (Z = 47), and gold (Z = 79) foil backlighters irradiated with 3 kJ–12 kJ of laser energy. The spectra have been recorded using a dual crystal spectrometer (DCS), a two-channel transmission spectrometer covering 11 keV–45 keV and 19 keV–90 keV energy bands. The DCS has been calibrated so that the spectral intensities can be compared between different campaigns.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1708986

Alternate ID(s):: OSTI ID: 1644715

Report Number(s):: LLNL-JRNL-810283; 1016606; TRN: US2204883

Journal Information:: Review of Scientific Instruments, Vol. 91, Issue 8; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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