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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]

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:
Report Number(s):
LLNL-JRNL-644035
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US1800273
Grant/Contract Number:
AC52-07NA27344
Type:
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)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; inertial confinement fusion; hohlraum
OSTI Identifier:
1411686

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., 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. 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., 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. doi: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},
journal = {Physical Review Letters},
number = 10,
volume = 112,
place = {United States},
year = {2014},
month = {3}
}