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Title: Ab initio determination of the instability growth rate of warm dense beryllium-deuterium interface

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:
;  [1] ;  [2] ; ;  [1]
  1. Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22486440
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 10; 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; 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