Progress toward NIF opacity measurements

Perry, T. S.; Heeter, R. F.; Opachich, Y. P.; Johns, H. M.; King, J. A.; Dodd, E. S.; DeVolder, B. G.; Sherrill, M. E.; Wilson, B. G.; Iglesias, C. A.; Kline, J. L.; Flippo, K. A.; Cardenas, T.; Schneider, M. B.; Liedahl, D. A.; Urbatsch, T. J.; Douglas, M. R.; Bailey, J. E.; Rochau, G. A.

doi:10.1016/j.hedp.2019.100728

Progress toward NIF opacity measurements

Journal Article · Mon Oct 12 00:00:00 EDT 2020 · High Energy Density Physics

DOI:https://doi.org/10.1016/j.hedp.2019.100728· OSTI ID:1735892

^[1]; Heeter, R. F. ^[2]; ^[2]; ^[1]; King, J. A. ^[3]; ^[1]; DeVolder, B. G. ^[1]; ^[1]; Wilson, B. G. ^[2]; Iglesias, C. A. ^[2]; ^[1]; ^[1]; ^[1]; Schneider, M. B. ^[4]; Liedahl, D. A. ^[2]; ^[1]; Douglas, M. R. ^[1]; Bailey, J. E. ^[4]; Rochau, G. A. ^[4]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Nevada National Security Site (NNSS), Livermore, CA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

The opacities of iron and other mid-Z elements help to regulate the transport of energy in the sun. Recent experiments on the Sandia National Laboratories Z machine have shown large discrepancies between the measured and calculated opacities of iron at certain solar conditions. To replicate these opacity measurements a platform is being developed on the National Ignition Facility to measure the opacities of iron and other elements at the same conditions as in the Z experiments. The NIF platform consists of a hohlraum to heat the opacity sample to the desired conditions, a separate backlighter to radiograph the sample, and a spectrometer to give the spectrally resolved opacity. Not only must the opacity be measured but the temperature and density of the sample must also be accurately determined. This platform has now produced its first iron transmission measurements. Overall, these measurements will be presented along with plans for future measurements and details on how the measurements will be improved.

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

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

Grant/Contract Number:: 89233218CNA000001; AC52-07NA27344; AC52-06NA25396; AC04-94AL85000

OSTI ID:: 1735892

Alternate ID(s):: OSTI ID: 1755835
OSTI ID: 1779522

Report Number(s):: LA-UR--18-29785

Journal Information:: High Energy Density Physics, Journal Name: High Energy Density Physics Vol. 35; ISSN 1574-1818

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (13)

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