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Title: Laboratory measurements of geometrical effects in the x-ray emission of optically thick lines for ICF diagnostics

Abstract

Understanding the effects of radiative transfer in High Energy Density Physics experiments is critical for the characterization of the thermodynamic properties of highly ionized matter, in particular in Inertial Confinement Fusion (ICF). In this paper, we report on non-Local Thermodynamic Equilibrium experiments on cylindrical targets carried out at the Omega Laser Facility at the Laboratory for Laser Energetics, Rochester NY, which aim to characterize these effects. In these experiments, a 50/50 mixture of iron and vanadium, with a thickness of 2000 Å and a diameter of 250 μm, is contained within a beryllium tamper, with a thickness of 10 μm and a diameter of 1000 μm. Each side of the beryllium tamper is then irradiated using 18 of the 60 Omega beams with an intensity of roughly 3 × 1014 W cm-2 per side, over a duration of 3 ns. Spectroscopic measurements show that a plasma temperature on the order of 2 keV was produced. Imaging data show that the plasma remains cylindrical, with geometrical aspect ratios (quotient between the height and the radius of the cylinder) from 0.4 to 2.0. The temperatures in this experiment were kept sufficiently low (~1–2 keV) so that the optically thin Li-like satellite emissionmore » could be used for temperature diagnosis. This allowed for the characterization of optical-depth-dependent geometric effects in the vanadium line emission. Lastly, simulations present good agreement with the data, which allows this study to benchmark these effects in order to take them into account to deduce temperature and density in future ICF experiments, such as those performed at the National Ignition Facility.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2];  [2];  [2]; ORCiD logo [2];  [2];  [2]; ORCiD logo [2]; ORCiD logo [3];  [3];  [4];  [1]; ORCiD logo [2]
+ Show Author Affiliations
  1. Univ. of Oxford (United Kingdom)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. General Atomics, San Diego, CA (United States)
  4. Univ. of Oxford (United Kingdom); Imperial College, London (United Kingdom)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1557078
Alternate Identifier(s):
OSTI ID: 1526786
Report Number(s):
LLNL-JRNL-767595
Journal ID: ISSN 1070-664X; 958072
Grant/Contract Number:  
AC52-07NA27344; NA0001808; B617350
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 6; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Pérez-Callejo, G., Jarrott, L. C., Liedahl, D. A., Marley, E. V., Kemp, G. E., Heeter, R. F., Emig, J. A., Foord, M. E., Widmann, K., Jaquez, J., Huang, H., Rose, S. J., Wark, J. S., and Schneider, M. B. Laboratory measurements of geometrical effects in the x-ray emission of optically thick lines for ICF diagnostics. United States: N. p., 2019. Web. doi:10.1063/1.5096972.
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Pérez-Callejo, G., Jarrott, L. C., Liedahl, D. A., Marley, E. V., Kemp, G. E., Heeter, R. F., Emig, J. A., Foord, M. E., Widmann, K., Jaquez, J., Huang, H., Rose, S. J., Wark, J. S., & Schneider, M. B. Laboratory measurements of geometrical effects in the x-ray emission of optically thick lines for ICF diagnostics. United States. https://doi.org/10.1063/1.5096972
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Pérez-Callejo, G., Jarrott, L. C., Liedahl, D. A., Marley, E. V., Kemp, G. E., Heeter, R. F., Emig, J. A., Foord, M. E., Widmann, K., Jaquez, J., Huang, H., Rose, S. J., Wark, J. S., and Schneider, M. B. Tue . "Laboratory measurements of geometrical effects in the x-ray emission of optically thick lines for ICF diagnostics". United States. https://doi.org/10.1063/1.5096972. https://www.osti.gov/servlets/purl/1557078.
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@article{osti_1557078,
title = {Laboratory measurements of geometrical effects in the x-ray emission of optically thick lines for ICF diagnostics},
author = {Pérez-Callejo, G. and Jarrott, L. C. and Liedahl, D. A. and Marley, E. V. and Kemp, G. E. and Heeter, R. F. and Emig, J. A. and Foord, M. E. and Widmann, K. and Jaquez, J. and Huang, H. and Rose, S. J. and Wark, J. S. and Schneider, M. B.},
abstractNote = {Understanding the effects of radiative transfer in High Energy Density Physics experiments is critical for the characterization of the thermodynamic properties of highly ionized matter, in particular in Inertial Confinement Fusion (ICF). In this paper, we report on non-Local Thermodynamic Equilibrium experiments on cylindrical targets carried out at the Omega Laser Facility at the Laboratory for Laser Energetics, Rochester NY, which aim to characterize these effects. In these experiments, a 50/50 mixture of iron and vanadium, with a thickness of 2000 Å and a diameter of 250 μm, is contained within a beryllium tamper, with a thickness of 10 μm and a diameter of 1000 μm. Each side of the beryllium tamper is then irradiated using 18 of the 60 Omega beams with an intensity of roughly 3 × 1014 W cm-2 per side, over a duration of 3 ns. Spectroscopic measurements show that a plasma temperature on the order of 2 keV was produced. Imaging data show that the plasma remains cylindrical, with geometrical aspect ratios (quotient between the height and the radius of the cylinder) from 0.4 to 2.0. The temperatures in this experiment were kept sufficiently low (~1–2 keV) so that the optically thin Li-like satellite emission could be used for temperature diagnosis. This allowed for the characterization of optical-depth-dependent geometric effects in the vanadium line emission. Lastly, simulations present good agreement with the data, which allows this study to benchmark these effects in order to take them into account to deduce temperature and density in future ICF experiments, such as those performed at the National Ignition Facility.},
doi = {10.1063/1.5096972},
journal = {Physics of Plasmas},
number = 6,
volume = 26,
place = {United States},
year = {Tue Jun 18 00:00:00 EDT 2019},
month = {Tue Jun 18 00:00:00 EDT 2019}
}
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https://doi.org/10.1063/1.5096972
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Cited by: 9 works
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Figures / Tables:

FIG. 1 FIG. 1: Comparison between the emission from He-like V (Z=25) for different conditions. The dashed red line corresponds to the conditions studied by Gabriel and Jordan16 ($n_i$ = 108 cm−3), whereas the blue dotted line corresponds to $n_i$ = 1019 cm−3. Both simulations correspond to an electron temperature T =more » 600 eV. Note how the $\mathcal{x}$ and $\mathcal{z}$ lines are present in a coronal conditions, but they disappear for higher ion densities. The Be-like and Li-like contributions have been removed for clarity.« less
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