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Title: Measuring the shock impedance mismatch between high-density carbon and deuterium at the National Ignition Facility

Fine-grained diamond, or high-density carbon (HDC), is being used as an ablator for inertial confinement fusion (ICF) research at the National Ignition Facility (NIF). Accurate equation of state (EOS) knowledge over a wide range of phase space is critical in the design and analysis of integrated ICF experiments. Here in this paper, we report shock and release measurements of the shock impedance mismatch between HDC and liquid deuterium conducted during shock-timing experiments having a first shock in the ablator ranging between 8 and 14 Mbar. Using ultrafast Doppler imaging velocimetry to track the leading shock front, we characterize the shock velocity discontinuity upon the arrival of the shock at the HDC/liquid deuterium interface. Comparing the experimental data with tabular EOS models used to simulate integrated ICF experiments indicates the need for an improved multiphase EOS model for HDC in order to achieve a significant increase in neutron yield in indirect-driven ICF implosions with HDC ablators.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] more »;  [1] ;  [1] ;  [3] ;  [1] ;  [3] ;  [4] ;  [1] « less
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Univ. of Rochester, NY (United States). Dept. of Mechanical Engineering, and Physics and Astronomy
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  4. Diamond Materials GmbH, Freiburg (Germany)
Publication Date:
Report Number(s):
LLNL-JRNL-740027
Journal ID: ISSN 2469-9950; PRBMDO; 892349
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 14; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1455401
Alternate Identifier(s):
OSTI ID: 1433577

Millot, M., Celliers, P. M., Sterne, P. A., Benedict, L. X., Correa, A. A., Hamel, S., Ali, S. J., Baker, K. L., Berzak Hopkins, L. F., Biener, J., Collins, G. W., Coppari, F., Divol, L., Fernandez-Panella, A., Fratanduono, D. E., Haan, S. W., Le Pape, S., Meezan, N. B., Moore, A. S., Moody, J. D., Ralph, J. E., Ross, J. S., Rygg, J. R., Thomas, C., Turnbull, D. P., Wild, C., and Eggert, J. H.. Measuring the shock impedance mismatch between high-density carbon and deuterium at the National Ignition Facility. United States: N. p., Web. doi:10.1103/PhysRevB.97.144108.
Millot, M., Celliers, P. M., Sterne, P. A., Benedict, L. X., Correa, A. A., Hamel, S., Ali, S. J., Baker, K. L., Berzak Hopkins, L. F., Biener, J., Collins, G. W., Coppari, F., Divol, L., Fernandez-Panella, A., Fratanduono, D. E., Haan, S. W., Le Pape, S., Meezan, N. B., Moore, A. S., Moody, J. D., Ralph, J. E., Ross, J. S., Rygg, J. R., Thomas, C., Turnbull, D. P., Wild, C., & Eggert, J. H.. Measuring the shock impedance mismatch between high-density carbon and deuterium at the National Ignition Facility. United States. doi:10.1103/PhysRevB.97.144108.
Millot, M., Celliers, P. M., Sterne, P. A., Benedict, L. X., Correa, A. A., Hamel, S., Ali, S. J., Baker, K. L., Berzak Hopkins, L. F., Biener, J., Collins, G. W., Coppari, F., Divol, L., Fernandez-Panella, A., Fratanduono, D. E., Haan, S. W., Le Pape, S., Meezan, N. B., Moore, A. S., Moody, J. D., Ralph, J. E., Ross, J. S., Rygg, J. R., Thomas, C., Turnbull, D. P., Wild, C., and Eggert, J. H.. 2018. "Measuring the shock impedance mismatch between high-density carbon and deuterium at the National Ignition Facility". United States. doi:10.1103/PhysRevB.97.144108.
@article{osti_1455401,
title = {Measuring the shock impedance mismatch between high-density carbon and deuterium at the National Ignition Facility},
author = {Millot, M. and Celliers, P. M. and Sterne, P. A. and Benedict, L. X. and Correa, A. A. and Hamel, S. and Ali, S. J. and Baker, K. L. and Berzak Hopkins, L. F. and Biener, J. and Collins, G. W. and Coppari, F. and Divol, L. and Fernandez-Panella, A. and Fratanduono, D. E. and Haan, S. W. and Le Pape, S. and Meezan, N. B. and Moore, A. S. and Moody, J. D. and Ralph, J. E. and Ross, J. S. and Rygg, J. R. and Thomas, C. and Turnbull, D. P. and Wild, C. and Eggert, J. H.},
abstractNote = {Fine-grained diamond, or high-density carbon (HDC), is being used as an ablator for inertial confinement fusion (ICF) research at the National Ignition Facility (NIF). Accurate equation of state (EOS) knowledge over a wide range of phase space is critical in the design and analysis of integrated ICF experiments. Here in this paper, we report shock and release measurements of the shock impedance mismatch between HDC and liquid deuterium conducted during shock-timing experiments having a first shock in the ablator ranging between 8 and 14 Mbar. Using ultrafast Doppler imaging velocimetry to track the leading shock front, we characterize the shock velocity discontinuity upon the arrival of the shock at the HDC/liquid deuterium interface. Comparing the experimental data with tabular EOS models used to simulate integrated ICF experiments indicates the need for an improved multiphase EOS model for HDC in order to achieve a significant increase in neutron yield in indirect-driven ICF implosions with HDC ablators.},
doi = {10.1103/PhysRevB.97.144108},
journal = {Physical Review B},
number = 14,
volume = 97,
place = {United States},
year = {2018},
month = {4}
}