Replicating the Z iron opacity experiments on the NIF

Perry, T. S.; Heeter, R. F.; Opachich, Y. P.; Ross, P. W.; Kline, J. L.; Flippo, K. A.; Sherrill, M. E.; Dodd, E. S.; DeVolder, B. G.; Cardenas, T.; Archuleta, T. N.; Craxton, R. S.; Zhang, R.; McKenty, P. W.; Garcia, E. M.; Huffman, E. J.; King, J. A.; Ahmed, M. F.; Emig, J. A.; Ayers, S. L.; Barrios, M. A.; May, M. J.; Schneider, M. B.; Liedahl, D. A.; Wilson, B. G.; Urbatsch, T. J.; Iglesias, C. A.; Bailey, J. E.; Rochau, G. A.

doi:10.1016/j.hedp.2017.05.006

Replicating the Z iron opacity experiments on the NIF

Journal Article · Fri May 12 00:00:00 EDT 2017 · High Energy Density Physics

DOI:https://doi.org/10.1016/j.hedp.2017.05.006· OSTI ID:1358308

Perry, T. S. ^[1]; Heeter, R. F. ^[2]; Opachich, Y. P. ^[3]; Ross, P. W. ^[3]; Kline, J. L. ^[1]; Flippo, K. A. ^[1]; Sherrill, M. E. ^[1]; Dodd, E. S. ^[1]; DeVolder, B. G. ^[1]; Cardenas, T. ^[1]; Archuleta, T. N. ^[1]; Craxton, R. S. ^[4]; Zhang, R. ^[4]; McKenty, P. W. ^[4]; Garcia, E. M. ^[4]; Huffman, E. J. ^[3]; King, J. A. ^[3]; Ahmed, M. F. ^[2]; Emig, J. A. ^[2]; Ayers, S. L. ^[2] more »

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
National Security Technologies, LLC, Livermore, CA (United States)
Univ. of Rochester Lab. for Laser Energetics, Rochester, NY (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Here, X-ray opacity is a crucial factor of all radiation-hydrodynamics calculations, yet it is one of the least validated of the material properties in the simulation codes. Recent opacity experiments at the Sandia Z-machine have shown up to factors of two discrepancies between theory and experiment, casting doubt on the validity of the opacity models. Therefore, a new experimental opacity platform is being developed on the National Ignition Facility (NIF) not only to verify the Z-machine experimental results but also to extend the experiments to other temperatures and densities. The first experiments will be directed towards measuring the opacity of iron at a temperature of ~160 eV and an electron density of ~7 x 10²¹ cm^-3. Preliminary experiments on NIF have demonstrated the ability to create a sufficiently bright point backlighter using an imploding plastic capsule and also a hohlraum that can heat the opacity sample to the desired conditions. The first of these iron opacity experiments is expected to be performed in 2017.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1358308

Alternate ID(s):: OSTI ID: 1397496

Report Number(s):: LLNL-CONF--731466; PII: S1574181817300459

Journal Information:: High Energy Density Physics, Journal Name: High Energy Density Physics Journal Issue: C Vol. 23; ISSN 1574-1818

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Hohlraum modeling for opacity experiments on the National Ignition Facility Dodd, E. S.; DeVolder, B. G.; Martin, M. E. Physics of Plasmas, Vol. 25, Issue 6 https://doi.org/10.1063/1.5026285	journal	June 2018
Implementation of a 1-2 keV point-projection x-ray spectrometer on the National Ignition Facility King, J. A.; Opachich, Y. P.; Huffman, E. J. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038092	journal	October 2018
Iron X-ray Transmission at Temperature Near 150 eV Using the National Ignition Facility: First Measurements and Paths to Uncertainty Reduction Heeter, Robert; Perry, Ted; Johns, Heather Atoms, Vol. 6, Issue 4 https://doi.org/10.3390/atoms6040057	journal	October 2018

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