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Title: Capsule modeling of high foot implosion experiments on the National Ignition Facility

Abstract

This study summarizes the results of detailed, capsule-only simulations of a set of high foot implosion experiments conducted on the National Ignition Facility (NIF). These experiments span a range of ablator thicknesses, laser powers, and laser energies, and modeling these experiments as a set is important to assess whether the simulation model can reproduce the trends seen experimentally as the implosion parameters were varied. Two-dimensional (2D) simulations have been run including a number of effects—both nominal and off-nominal—such as hohlraum radiation asymmetries, surface roughness, the capsule support tent, and hot electron pre-heat. Selected three-dimensional simulations have also been run to assess the validity of the 2D axisymmetric approximation. As a composite, these simulations represent the current state of understanding of NIF high foot implosion performance using the best and most detailed computational model available. While the most detailed simulations show approximate agreement with the experimental data, it is evident that the model remains incomplete and further refinements are needed. Nevertheless, avenues for improved performance are clearly indicated.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1437706
Alternate Identifier(s):
OSTI ID: 1438752
Report Number(s):
LLNL-JRNL-705905
Journal ID: ISSN 0741-3335
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article: Published Article
Journal Name:
Plasma Physics and Controlled Fusion
Additional Journal Information:
Journal Name: Plasma Physics and Controlled Fusion Journal Volume: 59 Journal Issue: 5; Journal ID: ISSN 0741-3335
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; inertial confinement fusion; National Ignition Facility; radiation hydrodynamics

Citation Formats

Clark, D. S., Kritcher, A. L., Milovich, J. L., Salmonson, J. D., Weber, C. R., Haan, S. W., Hammel, B. A., Hinkel, D. E., Marinak, M. M., Patel, M. V., and Sepke, S. M. Capsule modeling of high foot implosion experiments on the National Ignition Facility. United Kingdom: N. p., 2017. Web. doi:10.1088/1361-6587/aa6216.
Clark, D. S., Kritcher, A. L., Milovich, J. L., Salmonson, J. D., Weber, C. R., Haan, S. W., Hammel, B. A., Hinkel, D. E., Marinak, M. M., Patel, M. V., & Sepke, S. M. Capsule modeling of high foot implosion experiments on the National Ignition Facility. United Kingdom. doi:10.1088/1361-6587/aa6216.
Clark, D. S., Kritcher, A. L., Milovich, J. L., Salmonson, J. D., Weber, C. R., Haan, S. W., Hammel, B. A., Hinkel, D. E., Marinak, M. M., Patel, M. V., and Sepke, S. M. Tue . "Capsule modeling of high foot implosion experiments on the National Ignition Facility". United Kingdom. doi:10.1088/1361-6587/aa6216.
@article{osti_1437706,
title = {Capsule modeling of high foot implosion experiments on the National Ignition Facility},
author = {Clark, D. S. and Kritcher, A. L. and Milovich, J. L. and Salmonson, J. D. and Weber, C. R. and Haan, S. W. and Hammel, B. A. and Hinkel, D. E. and Marinak, M. M. and Patel, M. V. and Sepke, S. M.},
abstractNote = {This study summarizes the results of detailed, capsule-only simulations of a set of high foot implosion experiments conducted on the National Ignition Facility (NIF). These experiments span a range of ablator thicknesses, laser powers, and laser energies, and modeling these experiments as a set is important to assess whether the simulation model can reproduce the trends seen experimentally as the implosion parameters were varied. Two-dimensional (2D) simulations have been run including a number of effects—both nominal and off-nominal—such as hohlraum radiation asymmetries, surface roughness, the capsule support tent, and hot electron pre-heat. Selected three-dimensional simulations have also been run to assess the validity of the 2D axisymmetric approximation. As a composite, these simulations represent the current state of understanding of NIF high foot implosion performance using the best and most detailed computational model available. While the most detailed simulations show approximate agreement with the experimental data, it is evident that the model remains incomplete and further refinements are needed. Nevertheless, avenues for improved performance are clearly indicated.},
doi = {10.1088/1361-6587/aa6216},
journal = {Plasma Physics and Controlled Fusion},
issn = {0741-3335},
number = 5,
volume = 59,
place = {United Kingdom},
year = {2017},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1088/1361-6587/aa6216

Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

Figures / Tables:

Table 1 Table 1: Table 1. NIF implosion experiments simulated in this study. Here the simulated convergence ratio is defined as the ratio of the initial outer capsule radius to the hot spot radius at bang time in a 1-D no-burn simulation. Tion refers to the burn-weighted temperature inferred from the widthmore » of the primary emitted neutron spectrum, and the down-scattered ratio (DSR) is the ratio of the 10 – 12 MeV to 13 – 15 MeV components of the emitted neutron spectrum. Y 13 – 15 MeV refers to the primary neutron yield in the energy range of 13 – 15 MeV. All values are experimentally measured unless noted otherwise.« less

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