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Title: Characterization of a 1D-imaging high-energy x-ray backlighter driven by the National Ignition Facility Advanced Radiographic Capability laser

Abstract

Plastic deformation of samples compressed to Mbar pressures at high strain rates at the National Ignition Facility (NIF) forms the basis of ongoing material strength experiments in conditions relevant to meteor impacts, geophysics, armor development, and inertial confinement fusion. Hard x-ray radiography is the primary means of measuring the evolution of these samples, typically employing a slit-collimated high-Z microdot driven by the NIF laser to generate >40 keV x rays [E. Gumbrell et al., Rev. Sci. Instrum. 89, 10G118 (2018) and C. M. Huntington et al., Rev. Sci. Instrum. 89, 10G121 (2018)]. Alternatively, a dysprosium “micro-flag” target driven by the Advanced Radiographic Capability laser (∼2 kJ, 10 ps) can deliver significantly higher spatiotemporal resolution [M. P. Hill et al., Rev. Sci. Instrum. 92, 033535 (2021)], especially in high-opacity samples. Initial experiments revealed problematic brightness and spectral gradients from this source, but by radiographing a set of diamond-turned, 105 µm-thick Pb test objects and supported by simulations using the 3D Monte Carlo code GEANT4, these geometry-dependent gradients across the field of view are quantified and mitigation strategies are assessed. In addition to significantly enhancing the modulation transfer function compared to the existing system, image stacking from multiple layers of image plate ismore » shown to almost double the signal to noise ratio that will reduce uncertainties in future dynamic strength experiments.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2];  [2];  [2];  [2];  [2];  [3]; ORCiD logo [2]; ORCiD logo [2];  [2]; ORCiD logo [2]; ORCiD logo [2]
+ Show Author Affiliations
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Atomic Weapons Establishment (AWE), Aldermaston (United Kingdom)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Atomic Weapons Establishment (AWE), Aldermaston (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:
1891735
Alternate Identifier(s):
OSTI ID: 1891355
Report Number(s):
LLNL-JRNL-836070
Journal ID: ISSN 0034-6748; 1055201; TRN: US2310409
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 93; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; plasma physics; lasers; signal-to-noise ratio; high-energy X rays; geophysics; signal processing; optical imaging; deformation; radiography; computer simulation

Citation Formats

Hill, M. P., Williams, G. J., Kalantar, D. H., Bachmann, B., Martinez, D. A., Stan, C. V., Murphy, A., Arend, M. J., Mercado, G. A., Wong, H. C., Dunn, Z., Santos, C. D., Lockard, T. E., Gumbrell, E. T., Rudd, R. E., McNaney, J. M., Le Galloudec, K. K., Remington, B. A., and Park, H. -S. Characterization of a 1D-imaging high-energy x-ray backlighter driven by the National Ignition Facility Advanced Radiographic Capability laser. United States: N. p., 2022. Web. doi:10.1063/5.0101886.
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Hill, M. P., Williams, G. J., Kalantar, D. H., Bachmann, B., Martinez, D. A., Stan, C. V., Murphy, A., Arend, M. J., Mercado, G. A., Wong, H. C., Dunn, Z., Santos, C. D., Lockard, T. E., Gumbrell, E. T., Rudd, R. E., McNaney, J. M., Le Galloudec, K. K., Remington, B. A., & Park, H. -S. Characterization of a 1D-imaging high-energy x-ray backlighter driven by the National Ignition Facility Advanced Radiographic Capability laser. United States. https://doi.org/10.1063/5.0101886
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Hill, M. P., Williams, G. J., Kalantar, D. H., Bachmann, B., Martinez, D. A., Stan, C. V., Murphy, A., Arend, M. J., Mercado, G. A., Wong, H. C., Dunn, Z., Santos, C. D., Lockard, T. E., Gumbrell, E. T., Rudd, R. E., McNaney, J. M., Le Galloudec, K. K., Remington, B. A., and Park, H. -S. Thu . "Characterization of a 1D-imaging high-energy x-ray backlighter driven by the National Ignition Facility Advanced Radiographic Capability laser". United States. https://doi.org/10.1063/5.0101886. https://www.osti.gov/servlets/purl/1891735.
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@article{osti_1891735,
title = {Characterization of a 1D-imaging high-energy x-ray backlighter driven by the National Ignition Facility Advanced Radiographic Capability laser},
author = {Hill, M. P. and Williams, G. J. and Kalantar, D. H. and Bachmann, B. and Martinez, D. A. and Stan, C. V. and Murphy, A. and Arend, M. J. and Mercado, G. A. and Wong, H. C. and Dunn, Z. and Santos, C. D. and Lockard, T. E. and Gumbrell, E. T. and Rudd, R. E. and McNaney, J. M. and Le Galloudec, K. K. and Remington, B. A. and Park, H. -S.},
abstractNote = {Plastic deformation of samples compressed to Mbar pressures at high strain rates at the National Ignition Facility (NIF) forms the basis of ongoing material strength experiments in conditions relevant to meteor impacts, geophysics, armor development, and inertial confinement fusion. Hard x-ray radiography is the primary means of measuring the evolution of these samples, typically employing a slit-collimated high-Z microdot driven by the NIF laser to generate >40 keV x rays [E. Gumbrell et al., Rev. Sci. Instrum. 89, 10G118 (2018) and C. M. Huntington et al., Rev. Sci. Instrum. 89, 10G121 (2018)]. Alternatively, a dysprosium “micro-flag” target driven by the Advanced Radiographic Capability laser (∼2 kJ, 10 ps) can deliver significantly higher spatiotemporal resolution [M. P. Hill et al., Rev. Sci. Instrum. 92, 033535 (2021)], especially in high-opacity samples. Initial experiments revealed problematic brightness and spectral gradients from this source, but by radiographing a set of diamond-turned, 105 µm-thick Pb test objects and supported by simulations using the 3D Monte Carlo code GEANT4, these geometry-dependent gradients across the field of view are quantified and mitigation strategies are assessed. In addition to significantly enhancing the modulation transfer function compared to the existing system, image stacking from multiple layers of image plate is shown to almost double the signal to noise ratio that will reduce uncertainties in future dynamic strength experiments.},
doi = {10.1063/5.0101886},
journal = {Review of Scientific Instruments},
number = 10,
volume = 93,
place = {United States},
year = {Thu Oct 06 00:00:00 EDT 2022},
month = {Thu Oct 06 00:00:00 EDT 2022}
}
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https://doi.org/10.1063/5.0101886
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