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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 paper 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. 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:
; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
22600241
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 5; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABLATION; ASYMMETRY; CAPSULES; COMPUTERIZED SIMULATION; CONVERGENCE; DEUTERIUM; IMPLOSIONS; INERTIAL CONFINEMENT; PERTURBATION THEORY; PLASMA; RADIATION FLUX; SILICON OXIDES; THERMONUCLEAR IGNITION; THREE-DIMENSIONAL CALCULATIONS; TRITIUM; TWO-DIMENSIONAL CALCULATIONS; US NATIONAL IGNITION FACILITY

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. Sun . "Three-dimensional simulations of low foot and high foot implosion experiments on the National Ignition Facility". United States. doi:10.1063/1.4943527.
@article{osti_22600241,
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 paper 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. 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 = {5}
}

Works referencing / citing this record:

Theoretical and simulation research of hydrodynamic instabilities in inertial-confinement fusion implosions
journal, March 2017

  • Wang, LiFeng; Ye, WenHua; He, XianTu
  • Science China Physics, Mechanics & Astronomy, Vol. 60, Issue 5
  • DOI: 10.1007/s11433-017-9016-x