Comparison of plastic, high density carbon, and beryllium as indirect drive NIF ablators
Abstract
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 »
- Authors:
-
[1];
[1];
[2];
[1];
[1];
[1];
[1];
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1463835
- Alternate Identifier(s):
- OSTI ID: 1431395
- Report Number(s):
- LLNL-JRNL-742613
Journal ID: ISSN 1070-664X; 897326
- Grant/Contract Number:
- AC52-07NA27344
- Resource 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)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
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., 2018.
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. https://doi.org/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. Thu .
"Comparison of plastic, high density carbon, and beryllium as indirect drive NIF ablators". United States. https://doi.org/10.1063/1.5018000. https://www.osti.gov/servlets/purl/1463835.
@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 = {Thu Apr 05 00:00:00 EDT 2018},
month = {Thu Apr 05 00:00:00 EDT 2018}
}
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Works referencing / citing this record:
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