Ab initio determination of the instability growth rate of warm dense beryllium-deuterium interface
Abstract
Accurate knowledge about the interfacial unstable growth is of great importance in inertial confinement fusion. During implosions, the deuterium-tritium capsule is driven by laser beams or X-rays to access the strongly coupled and partially degenerated warm dense matter regime. At this stage, the effects of dissipative processes, such as diffusion and viscosity, have significant impact on the instability growth rates. Here, we present ab initio molecular dynamics simulations to determine the equations of state and the transport coefficients. Several models are used to estimate the reduction in the growth rate dispersion curves of Rayleigh-Taylor and Richtmyer-Meshkov instabilities with considering the presence of these dissipative effects. We show that these instability growth rates are effectively reduced when considering diffusion. The findings provide significant insights into the microscopic mechanism of the instability growth at the ablator-fuel interface and will refine the models used in the laser-driven hydrodynamic instability experiments.
- Authors:
-
- Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088 (China)
- Publication Date:
- OSTI Identifier:
- 22486440
- Resource Type:
- Journal Article
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BERYLLIUM; CAPSULES; COMPUTERIZED SIMULATION; DEUTERIUM; DIFFUSION; EQUATIONS OF STATE; IMPLOSIONS; INERTIAL CONFINEMENT; INSTABILITY GROWTH RATES; LASER RADIATION; MOLECULAR DYNAMICS METHOD; RAYLEIGH-TAYLOR INSTABILITY; TRITIUM; VISCOSITY; X RADIATION
Citation Formats
Wang, Cong, Zhang, Ping, Center for Applied Physics and Technology, Peking University, Beijing 100871, Li, Zi, and Li, DaFang. Ab initio determination of the instability growth rate of warm dense beryllium-deuterium interface. United States: N. p., 2015.
Web. doi:10.1063/1.4931994.
Wang, Cong, Zhang, Ping, Center for Applied Physics and Technology, Peking University, Beijing 100871, Li, Zi, & Li, DaFang. Ab initio determination of the instability growth rate of warm dense beryllium-deuterium interface. United States. https://doi.org/10.1063/1.4931994
Wang, Cong, Zhang, Ping, Center for Applied Physics and Technology, Peking University, Beijing 100871, Li, Zi, and Li, DaFang. 2015.
"Ab initio determination of the instability growth rate of warm dense beryllium-deuterium interface". United States. https://doi.org/10.1063/1.4931994.
@article{osti_22486440,
title = {Ab initio determination of the instability growth rate of warm dense beryllium-deuterium interface},
author = {Wang, Cong and Zhang, Ping and Center for Applied Physics and Technology, Peking University, Beijing 100871 and Li, Zi and Li, DaFang},
abstractNote = {Accurate knowledge about the interfacial unstable growth is of great importance in inertial confinement fusion. During implosions, the deuterium-tritium capsule is driven by laser beams or X-rays to access the strongly coupled and partially degenerated warm dense matter regime. At this stage, the effects of dissipative processes, such as diffusion and viscosity, have significant impact on the instability growth rates. Here, we present ab initio molecular dynamics simulations to determine the equations of state and the transport coefficients. Several models are used to estimate the reduction in the growth rate dispersion curves of Rayleigh-Taylor and Richtmyer-Meshkov instabilities with considering the presence of these dissipative effects. We show that these instability growth rates are effectively reduced when considering diffusion. The findings provide significant insights into the microscopic mechanism of the instability growth at the ablator-fuel interface and will refine the models used in the laser-driven hydrodynamic instability experiments.},
doi = {10.1063/1.4931994},
url = {https://www.osti.gov/biblio/22486440},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 10,
volume = 22,
place = {United States},
year = {Thu Oct 15 00:00:00 EDT 2015},
month = {Thu Oct 15 00:00:00 EDT 2015}
}