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Title: Integrated modeling of cryogenic layered highfoot experiments at the NIF

Integrated radiation hydrodynamic modeling in two dimensions, including the hohlraum and capsule, of layered cryogenic HighFoot Deuterium-Tritium (DT) implosions on the NIF successfully predicts important data trends. The model consists of a semi-empirical fit to low mode asymmetries and radiation drive multipliers to match shock trajectories, one dimensional inflight radiography, and time of peak neutron production. Application of the model across the HighFoot shot series, over a range of powers, laser energies, laser wavelengths, and target thicknesses predicts the neutron yield to within a factor of two for most shots. The Deuterium-Deuterium ion temperatures and the DT down scattered ratios, ratio of (10–12)/(13–15) MeV neutrons, roughly agree with data at peak fuel velocities <340 km/s and deviate at higher peak velocities, potentially due to flows and neutron scattering differences stemming from 3D or capsule support tent effects. These calculations show a significant amount alpha heating, 1–2.5× for shots where the experimental yield is within a factor of two, which has been achieved by increasing the fuel kinetic energy. This level of alpha heating is consistent with a dynamic hot spot model that is matched to experimental data and as determined from scaling of the yield with peak fuel velocity. Lastly,more » these calculations also show that low mode asymmetries become more important as the fuel velocity is increased, and that improving these low mode asymmetries can result in an increase in the yield by a factor of several.« less
Authors:
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-679660
Journal ID: ISSN 1070-664X; PHPAEN; 802733
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; 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:
1463014
Alternate Identifier(s):
OSTI ID: 1253394

Kritcher, A. L., Hinkel, D. E., Callahan, D. A., Hurricane, O. A., Clark, D., Casey, D. T., Dewald, E. L., Dittrich, T. R., Doppner, T., Barrios Garcia, M. A., Haan, S., Berzak Hopkins, L. F., Jones, O., Landen, O., Ma, T., Meezan, N., Milovich, J. L., Pak, A. E., Park, H. -S., Patel, P. K., Ralph, J., Robey, H. F., Salmonson, J. D., Sepke, S., Spears, B., Springer, P. T., Thomas, C. A., Town, R., Celliers, P. M., and Edwards, M. J.. Integrated modeling of cryogenic layered highfoot experiments at the NIF. United States: N. p., Web. doi:10.1063/1.4949351.
Kritcher, A. L., Hinkel, D. E., Callahan, D. A., Hurricane, O. A., Clark, D., Casey, D. T., Dewald, E. L., Dittrich, T. R., Doppner, T., Barrios Garcia, M. A., Haan, S., Berzak Hopkins, L. F., Jones, O., Landen, O., Ma, T., Meezan, N., Milovich, J. L., Pak, A. E., Park, H. -S., Patel, P. K., Ralph, J., Robey, H. F., Salmonson, J. D., Sepke, S., Spears, B., Springer, P. T., Thomas, C. A., Town, R., Celliers, P. M., & Edwards, M. J.. Integrated modeling of cryogenic layered highfoot experiments at the NIF. United States. doi:10.1063/1.4949351.
Kritcher, A. L., Hinkel, D. E., Callahan, D. A., Hurricane, O. A., Clark, D., Casey, D. T., Dewald, E. L., Dittrich, T. R., Doppner, T., Barrios Garcia, M. A., Haan, S., Berzak Hopkins, L. F., Jones, O., Landen, O., Ma, T., Meezan, N., Milovich, J. L., Pak, A. E., Park, H. -S., Patel, P. K., Ralph, J., Robey, H. F., Salmonson, J. D., Sepke, S., Spears, B., Springer, P. T., Thomas, C. A., Town, R., Celliers, P. M., and Edwards, M. J.. 2016. "Integrated modeling of cryogenic layered highfoot experiments at the NIF". United States. doi:10.1063/1.4949351. https://www.osti.gov/servlets/purl/1463014.
@article{osti_1463014,
title = {Integrated modeling of cryogenic layered highfoot experiments at the NIF},
author = {Kritcher, A. L. and Hinkel, D. E. and Callahan, D. A. and Hurricane, O. A. and Clark, D. and Casey, D. T. and Dewald, E. L. and Dittrich, T. R. and Doppner, T. and Barrios Garcia, M. A. and Haan, S. and Berzak Hopkins, L. F. and Jones, O. and Landen, O. and Ma, T. and Meezan, N. and Milovich, J. L. and Pak, A. E. and Park, H. -S. and Patel, P. K. and Ralph, J. and Robey, H. F. and Salmonson, J. D. and Sepke, S. and Spears, B. and Springer, P. T. and Thomas, C. A. and Town, R. and Celliers, P. M. and Edwards, M. J.},
abstractNote = {Integrated radiation hydrodynamic modeling in two dimensions, including the hohlraum and capsule, of layered cryogenic HighFoot Deuterium-Tritium (DT) implosions on the NIF successfully predicts important data trends. The model consists of a semi-empirical fit to low mode asymmetries and radiation drive multipliers to match shock trajectories, one dimensional inflight radiography, and time of peak neutron production. Application of the model across the HighFoot shot series, over a range of powers, laser energies, laser wavelengths, and target thicknesses predicts the neutron yield to within a factor of two for most shots. The Deuterium-Deuterium ion temperatures and the DT down scattered ratios, ratio of (10–12)/(13–15) MeV neutrons, roughly agree with data at peak fuel velocities <340 km/s and deviate at higher peak velocities, potentially due to flows and neutron scattering differences stemming from 3D or capsule support tent effects. These calculations show a significant amount alpha heating, 1–2.5× for shots where the experimental yield is within a factor of two, which has been achieved by increasing the fuel kinetic energy. This level of alpha heating is consistent with a dynamic hot spot model that is matched to experimental data and as determined from scaling of the yield with peak fuel velocity. Lastly, these calculations also show that low mode asymmetries become more important as the fuel velocity is increased, and that improving these low mode asymmetries can result in an increase in the yield by a factor of several.},
doi = {10.1063/1.4949351},
journal = {Physics of Plasmas},
number = 5,
volume = 23,
place = {United States},
year = {2016},
month = {5}
}