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Title: Understanding ICF hohlraums using NIF gated laser-entrance-hole images

Abstract

The newly available ns-gated laser-entrance-hole (LEH) imager on the National Ignition Facility provides routine, non-perturbative measurements of the x-ray emission from laser-heated plasmas inside the hohlraum as viewed at 19° to the hohlraum axis through one of its LEHs. Multiple images are acquired for a series of times and filter-selected x-ray energy bands within a single shot. The images provide time dependent data on phenomena including the effective radius of the LEH, the length of the gold-plasma “bubble” evolving off the interior wall surface heated by the outer beams, the evolving radius of the x-ray heated hohlraum wall, and the radius of the ablation front of the fusion capsule. Here, these measurements are explained and illustrated with sample data. These techniques are then applied to understand hohlraum behavior as a function of gas fill. For hohlraums with helium gas fill densities of 0.15 to 0.30 mg/cm 3, synthetic images computed from simulations agree well with experimental gated LEH images when an inhibited heat transport model [Jones et al., Phys. Plasmas 24, 056312 (2017)] is used. This model can be adjusted to reproduce the expansion rate of the laser-heated plasma bubble in such a way as to improve agreement with themore » images. At the higher 0.6 mg/cc gas fill, the experimental images show more pronounced 3D features, resulting in slightly less good agreement with the 2D simulations.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Commissariat a l'Energie Atomique (CEA), Arpajon (France)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1632379
Alternate Identifier(s):
OSTI ID: 1598078
Report Number(s):
LLNL-JRNL-790517
Journal ID: ISSN 1070-664X; 988625
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 27; Journal Issue: 2; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
Plasma physics; High energy density physics; Plasma expansion; Image sensors; Plasma properties and parameters; X-ray imaging; Hydrodynamics simulations

Citation Formats

Chen, Hui, Woods, D. T., Jones, O. S., Benedetti, L. R., Dewald, E. L., Izumi, N., MacLaren, S. A., Meezan, N. B., Moody, J. D., Palmer, N. E., Schneider, M. B., and Vandenboomgaerde, M. Understanding ICF hohlraums using NIF gated laser-entrance-hole images. United States: N. p., 2020. Web. doi:10.1063/1.5128501.
Chen, Hui, Woods, D. T., Jones, O. S., Benedetti, L. R., Dewald, E. L., Izumi, N., MacLaren, S. A., Meezan, N. B., Moody, J. D., Palmer, N. E., Schneider, M. B., & Vandenboomgaerde, M. Understanding ICF hohlraums using NIF gated laser-entrance-hole images. United States. doi:10.1063/1.5128501.
Chen, Hui, Woods, D. T., Jones, O. S., Benedetti, L. R., Dewald, E. L., Izumi, N., MacLaren, S. A., Meezan, N. B., Moody, J. D., Palmer, N. E., Schneider, M. B., and Vandenboomgaerde, M. Thu . "Understanding ICF hohlraums using NIF gated laser-entrance-hole images". United States. doi:10.1063/1.5128501.
@article{osti_1632379,
title = {Understanding ICF hohlraums using NIF gated laser-entrance-hole images},
author = {Chen, Hui and Woods, D. T. and Jones, O. S. and Benedetti, L. R. and Dewald, E. L. and Izumi, N. and MacLaren, S. A. and Meezan, N. B. and Moody, J. D. and Palmer, N. E. and Schneider, M. B. and Vandenboomgaerde, M.},
abstractNote = {The newly available ns-gated laser-entrance-hole (LEH) imager on the National Ignition Facility provides routine, non-perturbative measurements of the x-ray emission from laser-heated plasmas inside the hohlraum as viewed at 19° to the hohlraum axis through one of its LEHs. Multiple images are acquired for a series of times and filter-selected x-ray energy bands within a single shot. The images provide time dependent data on phenomena including the effective radius of the LEH, the length of the gold-plasma “bubble” evolving off the interior wall surface heated by the outer beams, the evolving radius of the x-ray heated hohlraum wall, and the radius of the ablation front of the fusion capsule. Here, these measurements are explained and illustrated with sample data. These techniques are then applied to understand hohlraum behavior as a function of gas fill. For hohlraums with helium gas fill densities of 0.15 to 0.30 mg/cm3, synthetic images computed from simulations agree well with experimental gated LEH images when an inhibited heat transport model [Jones et al., Phys. Plasmas 24, 056312 (2017)] is used. This model can be adjusted to reproduce the expansion rate of the laser-heated plasma bubble in such a way as to improve agreement with the images. At the higher 0.6 mg/cc gas fill, the experimental images show more pronounced 3D features, resulting in slightly less good agreement with the 2D simulations.},
doi = {10.1063/1.5128501},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 2,
volume = 27,
place = {United States},
year = {2020},
month = {2}
}

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