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Title: Comparison of plastic, high density carbon, and beryllium as indirect drive NIF ablators

Detailed radiation hydrodynamic simulations calibrated to experimental data have been used to compare the relative strengths and weaknesses of three candidate indirect drive ablator materials now tested at the NIF: plastic, High Density Carbon (HDC) or diamond, and beryllium. We apply a common simulation methodology to several currently fielded ablator platforms to benchmark the model and extrapolate designs to the full NIF envelope to compare on a more equal footing. This paper focuses on modeling of the hohlraum energetics which accurately reproduced measured changes in symmetry when changes to the hohlraum environment were made within a given platform. Calculations suggest that all three ablator materials can achieve a symmetric implosion at a capsule outer radius of 1100 m, laser energy of 1.8 MJ, and DT ice mass of 185 g. However, there is more uncertainty in the symmetry predictions for the plastic and beryllium designs. Scaled diamond designs had the most calculated margin for achieving symmetry and the highest fuel absorbed energy at the same scale compared to plastic or beryllium. A comparison of the relative hydrodynamic stability was made using ultra-high resolution capsule simulations and the two dimensional radiation fluxes described in this work. These simulations, which include lowmore » and high mode perturbations, suggest that diamond is currently the most promising for achieving higher yields in the near future followed by plastic and more data required to understand beryllium.« less
Authors:
 [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [2] ; ORCiD logo [2] ;  [1] ;  [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1] ;  [1] ;  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-742613
Journal ID: ISSN 1070-664X; 897326
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
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
OSTI Identifier:
1463835
Alternate Identifier(s):
OSTI ID: 1431395

Kritcher, A. L., Clark, D., Haan, S., Yi, S. A., Zylstra, A. B., Callahan, D. A., Hinkel, D. E., Berzak Hopkins, L. F., Hurricane, O. A., Landen, O. L., MacLaren, S. A., Meezan, N. B., Patel, P. K., Ralph, J., Thomas, C. A., Town, R., and Edwards, M. J.. Comparison of plastic, high density carbon, and beryllium as indirect drive NIF ablators. United States: N. p., Web. doi:10.1063/1.5018000.
Kritcher, A. L., Clark, D., Haan, S., Yi, S. A., Zylstra, A. B., Callahan, D. A., Hinkel, D. E., Berzak Hopkins, L. F., Hurricane, O. A., Landen, O. L., MacLaren, S. A., Meezan, N. B., Patel, P. K., Ralph, J., Thomas, C. A., Town, R., & Edwards, M. J.. Comparison of plastic, high density carbon, and beryllium as indirect drive NIF ablators. United States. doi:10.1063/1.5018000.
Kritcher, A. L., Clark, D., Haan, S., Yi, S. A., Zylstra, A. B., Callahan, D. A., Hinkel, D. E., Berzak Hopkins, L. F., Hurricane, O. A., Landen, O. L., MacLaren, S. A., Meezan, N. B., Patel, P. K., Ralph, J., Thomas, C. A., Town, R., and Edwards, M. J.. 2018. "Comparison of plastic, high density carbon, and beryllium as indirect drive NIF ablators". United States. doi:10.1063/1.5018000.
@article{osti_1463835,
title = {Comparison of plastic, high density carbon, and beryllium as indirect drive NIF ablators},
author = {Kritcher, A. L. and Clark, D. and Haan, S. and Yi, S. A. and Zylstra, A. B. and Callahan, D. A. and Hinkel, D. E. and Berzak Hopkins, L. F. and Hurricane, O. A. and Landen, O. L. and MacLaren, S. A. and Meezan, N. B. and Patel, P. K. and Ralph, J. and Thomas, C. A. and Town, R. and Edwards, M. J.},
abstractNote = {Detailed radiation hydrodynamic simulations calibrated to experimental data have been used to compare the relative strengths and weaknesses of three candidate indirect drive ablator materials now tested at the NIF: plastic, High Density Carbon (HDC) or diamond, and beryllium. We apply a common simulation methodology to several currently fielded ablator platforms to benchmark the model and extrapolate designs to the full NIF envelope to compare on a more equal footing. This paper focuses on modeling of the hohlraum energetics which accurately reproduced measured changes in symmetry when changes to the hohlraum environment were made within a given platform. Calculations suggest that all three ablator materials can achieve a symmetric implosion at a capsule outer radius of 1100 m, laser energy of 1.8 MJ, and DT ice mass of 185 g. However, there is more uncertainty in the symmetry predictions for the plastic and beryllium designs. Scaled diamond designs had the most calculated margin for achieving symmetry and the highest fuel absorbed energy at the same scale compared to plastic or beryllium. A comparison of the relative hydrodynamic stability was made using ultra-high resolution capsule simulations and the two dimensional radiation fluxes described in this work. These simulations, which include low and high mode perturbations, suggest that diamond is currently the most promising for achieving higher yields in the near future followed by plastic and more data required to understand beryllium.},
doi = {10.1063/1.5018000},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {2018},
month = {4}
}