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Title: Novel Characterization of Capsule X-Ray Drive at the National Ignition Facility [Using ViewFactor Experiments to Measure Hohlraum X-Radiation Drive from the Capsule Point-of-View in Ignition Experiments on the National Ignition Facility]

Abstract

Here, indirect drive experiments at the National Ignition Facility are designed to achieve fusion by imploding a fuel capsule with x rays from a laser-driven hohlraum. Previous experiments have been unable to determine whether a deficit in measured ablator implosion velocity relative to simulations is due to inadequate models of the hohlraum or ablator physics. ViewFactor experiments allow for the first time a direct measure of the x-ray drive from the capsule point of view. The experiments show a 15%–25% deficit relative to simulations and thus explain nearly all of the disagreement with the velocity data. In addition, the data from this open geometry provide much greater constraints on a predictive model of laser-driven hohlraum performance than the nominal ignition target.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1];  [2];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Atomic Weapons Establishment, Reading (United Kingdom)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1411686
Report Number(s):
LLNL-JRNL-644035
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1800273
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 10; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; inertial confinement fusion; hohlraum

Citation Formats

MacLaren, S. A., Schneider, M. B., Widmann, K., Hammer, J. H., Yoxall, B. E., Moody, J. D., Bell, P. M., Benedetti, L. R., Bradley, D. K., Edwards, M. J., Guymer, T. M., Hinkel, D. E., Hsing, W. W., Kervin, M. L., Meezan, N. B., Moore, A. S., and Ralph, J. E. Novel Characterization of Capsule X-Ray Drive at the National Ignition Facility [Using ViewFactor Experiments to Measure Hohlraum X-Radiation Drive from the Capsule Point-of-View in Ignition Experiments on the National Ignition Facility]. United States: N. p., 2014. Web. doi:10.1103/PhysRevLett.112.105003.
MacLaren, S. A., Schneider, M. B., Widmann, K., Hammer, J. H., Yoxall, B. E., Moody, J. D., Bell, P. M., Benedetti, L. R., Bradley, D. K., Edwards, M. J., Guymer, T. M., Hinkel, D. E., Hsing, W. W., Kervin, M. L., Meezan, N. B., Moore, A. S., & Ralph, J. E. Novel Characterization of Capsule X-Ray Drive at the National Ignition Facility [Using ViewFactor Experiments to Measure Hohlraum X-Radiation Drive from the Capsule Point-of-View in Ignition Experiments on the National Ignition Facility]. United States. https://doi.org/10.1103/PhysRevLett.112.105003
MacLaren, S. A., Schneider, M. B., Widmann, K., Hammer, J. H., Yoxall, B. E., Moody, J. D., Bell, P. M., Benedetti, L. R., Bradley, D. K., Edwards, M. J., Guymer, T. M., Hinkel, D. E., Hsing, W. W., Kervin, M. L., Meezan, N. B., Moore, A. S., and Ralph, J. E. 2014. "Novel Characterization of Capsule X-Ray Drive at the National Ignition Facility [Using ViewFactor Experiments to Measure Hohlraum X-Radiation Drive from the Capsule Point-of-View in Ignition Experiments on the National Ignition Facility]". United States. https://doi.org/10.1103/PhysRevLett.112.105003. https://www.osti.gov/servlets/purl/1411686.
@article{osti_1411686,
title = {Novel Characterization of Capsule X-Ray Drive at the National Ignition Facility [Using ViewFactor Experiments to Measure Hohlraum X-Radiation Drive from the Capsule Point-of-View in Ignition Experiments on the National Ignition Facility]},
author = {MacLaren, S. A. and Schneider, M. B. and Widmann, K. and Hammer, J. H. and Yoxall, B. E. and Moody, J. D. and Bell, P. M. and Benedetti, L. R. and Bradley, D. K. and Edwards, M. J. and Guymer, T. M. and Hinkel, D. E. and Hsing, W. W. and Kervin, M. L. and Meezan, N. B. and Moore, A. S. and Ralph, J. E.},
abstractNote = {Here, indirect drive experiments at the National Ignition Facility are designed to achieve fusion by imploding a fuel capsule with x rays from a laser-driven hohlraum. Previous experiments have been unable to determine whether a deficit in measured ablator implosion velocity relative to simulations is due to inadequate models of the hohlraum or ablator physics. ViewFactor experiments allow for the first time a direct measure of the x-ray drive from the capsule point of view. The experiments show a 15%–25% deficit relative to simulations and thus explain nearly all of the disagreement with the velocity data. In addition, the data from this open geometry provide much greater constraints on a predictive model of laser-driven hohlraum performance than the nominal ignition target.},
doi = {10.1103/PhysRevLett.112.105003},
url = {https://www.osti.gov/biblio/1411686}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 10,
volume = 112,
place = {United States},
year = {Thu Mar 13 00:00:00 EDT 2014},
month = {Thu Mar 13 00:00:00 EDT 2014}
}

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Cited by: 79 works
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Works referenced in this record:

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journal, May 2013


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conference, January 2004


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The size and structure of the laser entrance hole in gas-filled hohlraums at the National Ignition Facility
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Time history prediction of direct-drive implosions on the Omega facility
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Three-dimensional simulations of low foot and high foot implosion experiments on the National Ignition Facility
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First beryllium capsule implosions on the National Ignition Facility
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Integrated modeling of cryogenic layered highfoot experiments at the NIF
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Detailed high-resolution three-dimensional simulations of OMEGA separated reactants inertial confinement fusion experiments
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Observation of hohlraum-wall motion with spectrally selective x-ray imaging at the National Ignition Facility
journal, August 2016


A hybrid-drive nonisobaric-ignition scheme for inertial confinement fusion
journal, August 2016


High-resolution modeling of indirectly driven high-convergence layered inertial confinement fusion capsule implosions
journal, May 2017


The relationship between gas fill density and hohlraum drive performance at the National Ignition Facility
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Backscatter spectra measurements of the two beams on the same cone on Shenguang-III laser facility
journal, January 2018


First demonstration of improved capsule implosions by reducing radiation preheat in uranium vs gold hohlraums
journal, September 2018


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


Three-dimensional modeling and hydrodynamic scaling of National Ignition Facility implosions
journal, May 2019


Saturation of cross-beam energy transfer for multispeckled laser beams involving both ion and electron dynamics
journal, August 2019


Understanding ICF hohlraums using NIF gated laser-entrance-hole images
journal, February 2020


Indirect drive ignition at the National Ignition Facility
journal, October 2016


Heat transport modeling of the dot spectroscopy platform on NIF
journal, February 2018


Incorporating kinetic effects on Nernst advection in inertial fusion simulations
journal, June 2018