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Title: Applications of deuterium-tritium equation of state based on density functional theory in inertial confinement fusion

Abstract

An accurate equation of state for deuterium-tritium mixture is of crucial importance in inertial confinement fusion. The equation of state can determine the compressibility of the imploding target and the energy deposited into the fusion fuel. In the present work, a new deuterium-tritium equation of state, which is calculated according to quantum molecular dynamic and orbital free molecular dynamic simulations, has been used to study the target implosion hydrodynamics. The results indicate that the peak density predicted by the new equation of state is ∼10% higher than the quotidian equation of state data. During the implosion, the areal density and neutron yield are also discussed.

Authors:
; ; ;  [1];  [2];  [1]
  1. Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22490936
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 6; 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; COMPRESSIBILITY; COMPUTERIZED SIMULATION; DENSITY FUNCTIONAL METHOD; DEUTERIUM; ENERGY ABSORPTION; EQUATIONS OF STATE; HYDRODYNAMICS; IMPLOSIONS; INERTIAL CONFINEMENT; MIXTURES; NEUTRONS; THERMONUCLEAR FUELS; TRITIUM

Citation Formats

Wang, Cong, He, Xian-Tu, Ye, Wen-Hua, Zhang, Ping, E-mail: zhang-ping@iapcm.ac.cn, Center for Applied Physics and Technology, Peking University, Beijing 100871, and Fan, Zheng-Feng. Applications of deuterium-tritium equation of state based on density functional theory in inertial confinement fusion. United States: N. p., 2015. Web. doi:10.1063/1.4922900.
Wang, Cong, He, Xian-Tu, Ye, Wen-Hua, Zhang, Ping, E-mail: zhang-ping@iapcm.ac.cn, Center for Applied Physics and Technology, Peking University, Beijing 100871, & Fan, Zheng-Feng. Applications of deuterium-tritium equation of state based on density functional theory in inertial confinement fusion. United States. doi:10.1063/1.4922900.
Wang, Cong, He, Xian-Tu, Ye, Wen-Hua, Zhang, Ping, E-mail: zhang-ping@iapcm.ac.cn, Center for Applied Physics and Technology, Peking University, Beijing 100871, and Fan, Zheng-Feng. Mon . "Applications of deuterium-tritium equation of state based on density functional theory in inertial confinement fusion". United States. doi:10.1063/1.4922900.
@article{osti_22490936,
title = {Applications of deuterium-tritium equation of state based on density functional theory in inertial confinement fusion},
author = {Wang, Cong and He, Xian-Tu and Ye, Wen-Hua and Zhang, Ping, E-mail: zhang-ping@iapcm.ac.cn and Center for Applied Physics and Technology, Peking University, Beijing 100871 and Fan, Zheng-Feng},
abstractNote = {An accurate equation of state for deuterium-tritium mixture is of crucial importance in inertial confinement fusion. The equation of state can determine the compressibility of the imploding target and the energy deposited into the fusion fuel. In the present work, a new deuterium-tritium equation of state, which is calculated according to quantum molecular dynamic and orbital free molecular dynamic simulations, has been used to study the target implosion hydrodynamics. The results indicate that the peak density predicted by the new equation of state is ∼10% higher than the quotidian equation of state data. During the implosion, the areal density and neutron yield are also discussed.},
doi = {10.1063/1.4922900},
journal = {Physics of Plasmas},
number = 6,
volume = 22,
place = {United States},
year = {Mon Jun 15 00:00:00 EDT 2015},
month = {Mon Jun 15 00:00:00 EDT 2015}
}
  • Using first-principles (FP) methods, we have performed ab initio compute for the equation of state (EOS), thermal conductivity, and opacity of deuterium-tritium (DT) in a wide range of densities and temperatures for inertial confinement fusion (ICF) applications. These systematic investigations have recently been expanded to accurately compute the plasma properties of CH ablators under extreme conditions. In particular, the first-principles EOS and thermal-conductivity tables of CH are self-consistently built from such FP calculations, which are benchmarked by experimental measurements. When compared with the traditional models used for these plasma properties in hydrocodes, significant differences have been identified in the warmmore » dense plasma regime. When these FP-calculated properties of DT and CH were used in our hydrodynamic simulations of ICF implosions, we found that the target performance in terms of neutron yield and energy gain can vary by a factor of 2 to 3, relative to traditional model simulations.« less
  • Understanding and designing inertial confinement fusion (ICF) implosions through radiation-hydrodynamics simulations relies on the accurate knowledge of the equation of state (EOS) of the deuterium and tritium fuels. To minimize the drive energy for ignition, the imploding shell of DT fuel must be kept as cold as possible. Such low-adiabat ICF implosions can access to coupled and degenerate plasma conditions, in which the analytical EOS models become inaccurate due to many-body effects. Using the path-integral Monte Carlo (PIMC) simulations we have derived a first-principles EOS (FPEOS) table of deuterium that covers typical ICF fuel conditions at densities ranging from 0.002more » to 1596 g/cm{sup 3} and temperatures of 1.35 eV to 5.5 keV. We report the internal energy and the pressure and discuss the structure of the plasma in terms of pair-correlation functions. When compared with the widely used SESAME table and the revised Kerley03 table, discrepancies in the internal energy and in the pressure are identified for moderately coupled and degenerate plasma conditions. In contrast to the SESAME table, the revised Kerley03 table is in better agreement with our FPEOS results over a wide range of densities and temperatures. Although subtle differences still exist for lower temperatures (T < 10 eV) and moderate densities (1 to 10 g/cm{sup 3}), hydrodynamics simulations of cryogenic ICF implosions using the FPEOS table and the Kerley03 table have resulted in similar results for the peak density, areal density ({rho}R), and neutron yield, which differ significantly from the SESAME simulations.« less
  • Cited by 53
  • Cited by 9
  • We have remotely monitored the thermodynamic phase of deuterium--tritium (DT) fuel inside glass shells used for inertial confinement fusion (ICF) research by observing the x-ray emissions from the shell. These studies are an adjunct to our beta heating experimental program. (M. T. Mruzek, D. L. Musinski, and J. S. Ankey, J. Appl. Phys. {bold 63}, 2217 (1988)). By monitoring the production of low-energy x rays ({lt} 18.6 keV) from the interaction of the beta decay with the shell walls, we are able to track phase changes between gas and solid. We incorporated the mature x-ray detection technology of scintillators andmore » photomultiplier tubes onto the experimental apparatus we use to study the beta heating effect. (M. T. Mruzek, J. S. Ankey, and D. N. Decker, J. Vac. Sci. Technol. A {bold 6}, 1889 (1988)). Restrictive space limitations were a major hardware consideration in the retrofit. We review the scientific basis for the technique, the proof of principle experiment that encouraged us to pursue it, and the final experimental configuration the x-ray probe has assumed. We suggest that a refinement of the measurement technique may provide information about the rate of DT fuel redistribution in beta heating targets.« less