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Title: Three-dimensional simulations of low foot and high foot implosion experiments on the National Ignition Facility

Abstract

In order to achieve the several hundred Gbar stagnation pressures necessary for inertial confinement fusion ignition, implosion experiments on the National Ignition Facility (NIF) [E. I. Moses et al., Phys. Plasmas 16, 041006 (2009)] require the compression of deuterium-tritium fuel layers by a convergence ratio as high as forty. Such high convergence implosions are subject to degradation by a range of perturbations, including the growth of small-scale defects due to hydrodynamic instabilities, as well as longer scale modulations due to radiation flux asymmetries in the enclosing hohlraum. Due to the broad range of scales involved, and also the genuinely three-dimensional (3D) character of the flow, accurately modeling NIF implosions remains at the edge of current simulation capabilities. This study describes the current state of progress of 3D capsule-only simulations of NIF implosions aimed at accurately describing the performance of specific NIF experiments. Current simulations include the effects of hohlraum radiation asymmetries, capsule surface defects, the capsule support tent and fill tube, and use a grid resolution shown to be converged in companion two-dimensional simulations. The results of detailed simulations of low foot implosions from the National Ignition Campaign are contrasted against results for more recent high foot implosions. While themore » simulations suggest that low foot performance was dominated by ablation front instability growth, especially the defect seeded by the capsule support tent, high foot implosions appear to be dominated by hohlraum flux asymmetries, although the support tent still plays a significant role. Finally, for both implosion types, the simulations show reasonable, though not perfect, agreement with the data and suggest that a reliable predictive capability is developing to guide future implosions toward ignition.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1438663
Alternate Identifier(s):
OSTI ID: 1241445
Report Number(s):
LLNL-JRNL-679716
Journal ID: ISSN 1070-664X; TRN: US1900478
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 5; 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; ice; hohlraum; crystal defects; radiography; hydrodynamics; surface measurements; neutrons; neutron imaging; experiment design; hydrological modeling

Citation Formats

Clark, D. S., Weber, C. R., Milovich, J. L., Salmonson, J. D., Kritcher, A. L., Haan, S. W., Hammel, B. A., Hinkel, D. E., Hurricane, O. A., Jones, O. S., Marinak, M. M., Patel, P. K., Robey, H. F., Sepke, S. M., and Edwards, M. J.. Three-dimensional simulations of low foot and high foot implosion experiments on the National Ignition Facility. United States: N. p., 2016. Web. https://doi.org/10.1063/1.4943527.
Clark, D. S., Weber, C. R., Milovich, J. L., Salmonson, J. D., Kritcher, A. L., Haan, S. W., Hammel, B. A., Hinkel, D. E., Hurricane, O. A., Jones, O. S., Marinak, M. M., Patel, P. K., Robey, H. F., Sepke, S. M., & Edwards, M. J.. Three-dimensional simulations of low foot and high foot implosion experiments on the National Ignition Facility. United States. https://doi.org/10.1063/1.4943527
Clark, D. S., Weber, C. R., Milovich, J. L., Salmonson, J. D., Kritcher, A. L., Haan, S. W., Hammel, B. A., Hinkel, D. E., Hurricane, O. A., Jones, O. S., Marinak, M. M., Patel, P. K., Robey, H. F., Sepke, S. M., and Edwards, M. J.. Mon . "Three-dimensional simulations of low foot and high foot implosion experiments on the National Ignition Facility". United States. https://doi.org/10.1063/1.4943527. https://www.osti.gov/servlets/purl/1438663.
@article{osti_1438663,
title = {Three-dimensional simulations of low foot and high foot implosion experiments on the National Ignition Facility},
author = {Clark, D. S. and Weber, C. R. and Milovich, J. L. and Salmonson, J. D. and Kritcher, A. L. and Haan, S. W. and Hammel, B. A. and Hinkel, D. E. and Hurricane, O. A. and Jones, O. S. and Marinak, M. M. and Patel, P. K. and Robey, H. F. and Sepke, S. M. and Edwards, M. J.},
abstractNote = {In order to achieve the several hundred Gbar stagnation pressures necessary for inertial confinement fusion ignition, implosion experiments on the National Ignition Facility (NIF) [E. I. Moses et al., Phys. Plasmas 16, 041006 (2009)] require the compression of deuterium-tritium fuel layers by a convergence ratio as high as forty. Such high convergence implosions are subject to degradation by a range of perturbations, including the growth of small-scale defects due to hydrodynamic instabilities, as well as longer scale modulations due to radiation flux asymmetries in the enclosing hohlraum. Due to the broad range of scales involved, and also the genuinely three-dimensional (3D) character of the flow, accurately modeling NIF implosions remains at the edge of current simulation capabilities. This study describes the current state of progress of 3D capsule-only simulations of NIF implosions aimed at accurately describing the performance of specific NIF experiments. Current simulations include the effects of hohlraum radiation asymmetries, capsule surface defects, the capsule support tent and fill tube, and use a grid resolution shown to be converged in companion two-dimensional simulations. The results of detailed simulations of low foot implosions from the National Ignition Campaign are contrasted against results for more recent high foot implosions. While the simulations suggest that low foot performance was dominated by ablation front instability growth, especially the defect seeded by the capsule support tent, high foot implosions appear to be dominated by hohlraum flux asymmetries, although the support tent still plays a significant role. Finally, for both implosion types, the simulations show reasonable, though not perfect, agreement with the data and suggest that a reliable predictive capability is developing to guide future implosions toward ignition.},
doi = {10.1063/1.4943527},
journal = {Physics of Plasmas},
number = 5,
volume = 23,
place = {United States},
year = {2016},
month = {3}
}

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    • Plasma Physics and Controlled Fusion, Vol. 59, Issue 5
    • DOI: 10.1088/1361-6587/aa6216

    Toward a burning plasma state using diamond ablator inertially confined fusion (ICF) implosions on the National Ignition Facility (NIF)
    journal, November 2018

    • Hopkins, L. Berzak; LePape, S.; Divol, L.
    • Plasma Physics and Controlled Fusion, Vol. 61, Issue 1
    • DOI: 10.1088/1361-6587/aad97e

    Beyond alpha-heating: driving inertially confined fusion implosions toward a burning-plasma state on the National Ignition Facility
    journal, November 2018

    • Hurricane, O. A.; Callahan, D. A.; Springer, P. T.
    • Plasma Physics and Controlled Fusion, Vol. 61, Issue 1
    • DOI: 10.1088/1361-6587/aaed71

    Yield reduction via the Knudsen layer effect in a mixture of fuel and pusher material
    journal, December 2018

    • McDevitt, Christopher J.; Tang, Xian-Zhu; Guo, Zehua
    • Plasma Physics and Controlled Fusion, Vol. 61, Issue 2
    • DOI: 10.1088/1361-6587/aaee5a

    Compression and burning of a direct-driven thermonuclear target under the conditions of inhomogeneous heating by a multi-beam megajoule laser
    journal, January 2019

    • Bel’kov, S. A.; Bondarenko, S. V.; Demchenko, N. N.
    • Plasma Physics and Controlled Fusion, Vol. 61, Issue 2
    • DOI: 10.1088/1361-6587/aaf062

    Modeling and projecting implosion performance for the National Ignition Facility
    journal, December 2018


    Progress of indirect drive inertial confinement fusion in the United States
    journal, July 2019


    Kinetic simulations of fusion ignition with hot-spot ablator mix
    journal, September 2019


    Effects of asymmetry and hot-spot shape on ignition capsules
    journal, August 2018


    Hydrodynamic instability seeding by oxygen nonuniformities in glow discharge polymer inertial fusion ablators
    journal, September 2018


    Energy transfer between lasers in low-gas-fill-density hohlraums
    journal, November 2018


    Development of Improved Radiation Drive Environment for High Foot Implosions at the National Ignition Facility
    journal, November 2016


    First Liquid Layer Inertial Confinement Fusion Implosions at the National Ignition Facility
    journal, December 2016


    Subpercent-Scale Control of 3D Low Modes of Targets Imploded in Direct-Drive Configuration on OMEGA
    journal, March 2018


    High-Performance Indirect-Drive Cryogenic Implosions at High Adiabat on the National Ignition Facility
    journal, September 2018


    Energy penetration into arrays of aligned nanowires irradiated with relativistic intensities: Scaling to terabar pressures
    journal, January 2017

    • Bargsten, Clayton; Hollinger, Reed; Capeluto, Maria Gabriela
    • Science Advances, Vol. 3, Issue 1
    • DOI: 10.1126/sciadv.1601558

    Inertial-confinement fusion with lasers
    journal, May 2016

    • Betti, R.; Hurricane, O. A.
    • Nature Physics, Vol. 12, Issue 5
    • DOI: 10.1038/nphys3736

    Impact of the Langdon effect on crossed-beam energy transfer
    journal, December 2019


    The role of hot spot mix in the low-foot and high-foot implosions on the NIF
    journal, May 2017

    • Ma, T.; Patel, P. K.; Izumi, N.
    • Physics of Plasmas, Vol. 24, Issue 5
    • DOI: 10.1063/1.4983625

    Capsule physics comparison of National Ignition Facility implosion designs using plastic, high density carbon, and beryllium ablators
    journal, March 2018

    • Clark, D. S.; Kritcher, A. L.; Yi, S. A.
    • Physics of Plasmas, Vol. 25, Issue 3
    • DOI: 10.1063/1.5016874

    Late-time mixing and turbulent behavior in high-energy-density shear experiments at high Atwood numbers
    journal, May 2018

    • Flippo, K. A.; Doss, F. W.; Merritt, E. C.
    • Physics of Plasmas, Vol. 25, Issue 5
    • DOI: 10.1063/1.5027194

    Probing the seeding of hydrodynamic instabilities from nonuniformities in ablator materials using 2D velocimetry
    journal, September 2018

    • Ali, S. J.; Celliers, P. M.; Haan, S.
    • Physics of Plasmas, Vol. 25, Issue 9
    • DOI: 10.1063/1.5047943

    Robustness to hydrodynamic instabilities in indirectly driven layered capsule implosions
    journal, January 2019

    • Haines, Brian M.; Olson, R. E.; Sweet, W.
    • Physics of Plasmas, Vol. 26, Issue 1
    • DOI: 10.1063/1.5080262

    X-ray shadow imprint of hydrodynamic instabilities on the surface of inertial confinement fusion capsules by the fuel fill tube
    journal, March 2017


    Thermal Temperature Measurements of Inertial Fusion Implosions
    journal, August 2018