First Measurement of Z Opacity Sample Evolution near Solar Interior Conditions Using Time-Resolved Spectroscopy

Loisel, Guillaume P.; Bailey, James E.; Nagayama, Taisuke; Hansen, Stephanie B.; Dunham, Gregory S.; Gard, Paul D.; Colombo, Anthony P.; Edens, Aaron D.; Speas, Robert; Looker, Q.; Kimmel, M.; Porter, John L.; Harding, Eric C.; Rochau, Gregory A.; Fontes, Christopher J.; Colgan, James P.; Blancard, Christophe; Cossé, Philippe; Faussurier, Gerald; Gilleron, F.; Pain, Jean-Christophe; Aberg, Daniel

doi:10.1103/PhysRevLett.134.095101

First Measurement of Z Opacity Sample Evolution near Solar Interior Conditions Using Time-Resolved Spectroscopy

Journal Article · Mon Mar 03 00:00:00 EST 2025 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.134.095101· OSTI ID:2585383

^[1]; Bailey, James E. ^[1]; Nagayama, Taisuke ^[1]; ^[1]; ^[1]; Gard, Paul D. ^[1]; ^[1]; ^[1]; Speas, Robert ^[1]; ^[1]; Kimmel, M. ^[1]; ^[1]; Harding, Eric C. ^[1]; Rochau, Gregory A. ^[1]; ^[2]; ^[2]; Blancard, Christophe ^[3]; ^[3]; Faussurier, Gerald ^[3]; ^[3] more »

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
CEA, DAM-DIF, Arpajon (France)
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Opacity model differences with Fe opacity measurements at high temperature (T>1⁢8⁢0 eV ) and high electron density (𝑛_𝑒>3×10²² cm⁻³) at nearly solar interior conditions have remained unresolved [Bailey et al., Nature 517, 56 (2015) and Nagayama et al., Phys. Rev. Lett. 122, 235001 (2019)]. Systematic errors from temporal gradients are one hypothesis for the discrepancy. Past data recorded on x-ray film provided spectral measurements over a time determined by the 2.8-ns backlighter duration. Here, we present the first measurements of opacity sample temporal evolution using novel hCMOS ultrafast x-ray camera technology. The measured conditions, measured backlighter time history, and modeled opacities are used to show that temporal gradients do not resolve the model-data discrepancy. The methods demonstrated provide potential advantages, including opacities at more extreme conditions, spectral line shift measurements, and improved measurements at other facilities.

View Accepted Manuscript (DOE)

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

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

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396; AC52-07NA27344; NA0003525

OSTI ID:: 2585383

Report Number(s):: LLNL-JRNL--2008333

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 134; ISSN 1079-7114; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

References (22)

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