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Title: Sensitivity of inertial confinement fusion hot spot properties to the deuterium-tritium fuel adiabat

Abstract

We determine the dependence of key Inertial Confinement Fusion (ICF) hot spot simulation properties on the deuterium-tritium fuel adiabat, here modified by addition of energy to the cold shell. Variation of this parameter reduces the simulation to experiment discrepancy in some, but not all, experimentally inferred quantities. Using simulations with radiation drives tuned to match experimental shots N120321 and N120405 from the National Ignition Campaign (NIC), we carry out sets of simulations with varying amounts of added entropy and examine the sensitivities of important experimental quantities. Neutron yields, burn widths, hot spot densities, and pressures follow a trend approaching their experimentally inferred quantities. Ion temperatures and areal densities are sensitive to the adiabat changes, but do not necessarily converge to their experimental quantities with the added entropy. This suggests that a modification to the simulation adiabat is one of, but not the only explanation of the observed simulation to experiment discrepancies. In addition, we use a theoretical model to predict 3D mix and observe a slight trend toward less mixing as the entropy is enhanced. Instantaneous quantities are assessed at the time of maximum neutron production, determined dynamically within each simulation. These trends contribute to ICF science, as an effortmore » to understand the NIC simulation to experiment discrepancy, and in their relation to the high foot experiments, which features a higher adiabat in the experimental design and an improved neutron yield in the experimental results.« less

Authors:
; ; ;  [1]; ; ;  [2]
  1. Department of Applied Mathematics and Statistics, Stony Brook University, Stony Brook, New York 11794-3600 (United States)
  2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
22408124
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ADIABATIC PROCESSES; DEUTERIUM; ENTROPY; EXPERIMENTAL DATA; HOT SPOTS; INERTIAL CONFINEMENT; MIXING; NEUTRONS; SIMULATION; THERMONUCLEAR FUELS; TRITIUM; US NATIONAL IGNITION FACILITY

Citation Formats

Melvin, J., Lim, H., Rana, V., Glimm, J., Cheng, B., Sharp, D. H., and Wilson, D. C.. Sensitivity of inertial confinement fusion hot spot properties to the deuterium-tritium fuel adiabat. United States: N. p., 2015. Web. doi:10.1063/1.4908278.
Melvin, J., Lim, H., Rana, V., Glimm, J., Cheng, B., Sharp, D. H., & Wilson, D. C.. Sensitivity of inertial confinement fusion hot spot properties to the deuterium-tritium fuel adiabat. United States. doi:10.1063/1.4908278.
Melvin, J., Lim, H., Rana, V., Glimm, J., Cheng, B., Sharp, D. H., and Wilson, D. C.. Sun . "Sensitivity of inertial confinement fusion hot spot properties to the deuterium-tritium fuel adiabat". United States. doi:10.1063/1.4908278.
@article{osti_22408124,
title = {Sensitivity of inertial confinement fusion hot spot properties to the deuterium-tritium fuel adiabat},
author = {Melvin, J. and Lim, H. and Rana, V. and Glimm, J. and Cheng, B. and Sharp, D. H. and Wilson, D. C.},
abstractNote = {We determine the dependence of key Inertial Confinement Fusion (ICF) hot spot simulation properties on the deuterium-tritium fuel adiabat, here modified by addition of energy to the cold shell. Variation of this parameter reduces the simulation to experiment discrepancy in some, but not all, experimentally inferred quantities. Using simulations with radiation drives tuned to match experimental shots N120321 and N120405 from the National Ignition Campaign (NIC), we carry out sets of simulations with varying amounts of added entropy and examine the sensitivities of important experimental quantities. Neutron yields, burn widths, hot spot densities, and pressures follow a trend approaching their experimentally inferred quantities. Ion temperatures and areal densities are sensitive to the adiabat changes, but do not necessarily converge to their experimental quantities with the added entropy. This suggests that a modification to the simulation adiabat is one of, but not the only explanation of the observed simulation to experiment discrepancies. In addition, we use a theoretical model to predict 3D mix and observe a slight trend toward less mixing as the entropy is enhanced. Instantaneous quantities are assessed at the time of maximum neutron production, determined dynamically within each simulation. These trends contribute to ICF science, as an effort to understand the NIC simulation to experiment discrepancy, and in their relation to the high foot experiments, which features a higher adiabat in the experimental design and an improved neutron yield in the experimental results.},
doi = {10.1063/1.4908278},
journal = {Physics of Plasmas},
number = 2,
volume = 22,
place = {United States},
year = {Sun Feb 15 00:00:00 EST 2015},
month = {Sun Feb 15 00:00:00 EST 2015}
}