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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:
Journal Article: 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. doi: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. doi: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. doi: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},
issn = {1070-664X},
number = 5,
volume = 23,
place = {United States},
year = {2016},
month = {3}
}

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