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Title: Thermal conductivity measurements of proton-heated warm dense aluminum

Journal Article · · Scientific Reports
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Michigan, Ann Arbor, MI (United States). Nuclear Engineering Department
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  4. The Ohio State Univ., Columbus, OH (United States). Physics Department
  5. The Ohio State Univ., Columbus, OH (United States). Physics Department
  6. University of California San Diego, La Jolla, CA (United States). Center for Energy Research

Thermal conductivity is one of the most crucial physical properties of matter when it comes to understanding heat transport, hydrodynamic evolution, and energy balance in systems ranging from astrophysical objects to fusion plasmas. In the warm dense matter regime, experimental data are very scarce so that many theoretical models remain untested. Here we present the first thermal conductivity measurements of aluminum at 0.5–2.7 g/cc and 2–10 eV, using a recently developed platform of differential heating. A temperature gradient is induced in a Au/Al dual-layer target by proton heating, and subsequent heat flow from the hotter Au to the Al rear surface is detected by two simultaneous time-resolved diagnostics. A systematic data set allows for constraining both thermal conductivity and equation-of-state models. Simulations using Purgatorio model or Sesame S27314 for Al thermal conductivity and LEOS for Au/Al release equation-of-state show good agreement with data after 15 ps. Discrepancy still exists at early time 0–15 ps, likely due to non-equilibrium conditions.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1395483
Report Number(s):
LLNL-JRNL-722677; PII: 7173
Journal Information:
Scientific Reports, Vol. 7, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 28 works
Citation information provided by
Web of Science

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Enhancing laser beam performance by interfering intense laser beamlets journal July 2019
Observations of non-linear plasmon damping in dense plasmas journal May 2018
A review on ab initio studies of static, transport, and optical properties of polystyrene under extreme conditions for inertial confinement fusion applications journal May 2018
Computational modeling of proton acceleration with multi-picosecond and high energy, kilojoule, lasers journal August 2018
Study of M-band X-ray preheating effect on shock propagation via streaked optical pyrometer system at SG-III prototype lasers journal January 2019
Thermal conductivity of dissociating water—an ab initio study journal February 2019
Testing thermal conductivity models with equilibrium molecular dynamics simulations of the one-component plasma journal October 2019