Thermal conductivity measurements of proton-heated warm dense aluminum

Abstract 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 ver...

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Main Authors:	A. McKelvey, G. E. Kemp, P. A. Sterne, A. Fernandez-Panella, R. Shepherd, M. Marinak, A. Link, G. W. Collins, H. Sio, J. King, R. R. Freeman, R. Hua, C. McGuffey, J. Kim, F. N. Beg, Y. Ping
Format:	Article
Language:	English
Published:	Nature Publishing Group 2017-08-01
Series:	Scientific Reports
Online Access:	https://doi.org/10.1038/s41598-017-07173-0

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record_format	Article
spelling	doaj-adfe59eb83e84a549b71227e88cedcc62020-12-08T00:08:27ZengNature Publishing GroupScientific Reports2045-23222017-08-017111010.1038/s41598-017-07173-0Thermal conductivity measurements of proton-heated warm dense aluminumA. McKelvey0G. E. Kemp1P. A. Sterne2A. Fernandez-Panella3R. Shepherd4M. Marinak5A. Link6G. W. Collins7H. Sio8J. King9R. R. Freeman10R. Hua11C. McGuffey12J. Kim13F. N. Beg14Y. Ping15Lawrence Livermore National LaboratoryLawrence Livermore National LaboratoryLawrence Livermore National LaboratoryLawrence Livermore National LaboratoryLawrence Livermore National LaboratoryLawrence Livermore National LaboratoryLawrence Livermore National LaboratoryLawrence Livermore National LaboratoryMassachusetts Institute of Technology, Plasma Science and Fusion CenterThe Ohio State University, Physics DepartmentThe Ohio State University, Physics DepartmentUniversity of California San Diego, Center for Energy ResearchUniversity of California San Diego, Center for Energy ResearchUniversity of California San Diego, Center for Energy ResearchUniversity of California San Diego, Center for Energy ResearchLawrence Livermore National LaboratoryAbstract 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.https://doi.org/10.1038/s41598-017-07173-0
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	A. McKelvey G. E. Kemp P. A. Sterne A. Fernandez-Panella R. Shepherd M. Marinak A. Link G. W. Collins H. Sio J. King R. R. Freeman R. Hua C. McGuffey J. Kim F. N. Beg Y. Ping
spellingShingle	A. McKelvey G. E. Kemp P. A. Sterne A. Fernandez-Panella R. Shepherd M. Marinak A. Link G. W. Collins H. Sio J. King R. R. Freeman R. Hua C. McGuffey J. Kim F. N. Beg Y. Ping Thermal conductivity measurements of proton-heated warm dense aluminum Scientific Reports
author_facet	A. McKelvey G. E. Kemp P. A. Sterne A. Fernandez-Panella R. Shepherd M. Marinak A. Link G. W. Collins H. Sio J. King R. R. Freeman R. Hua C. McGuffey J. Kim F. N. Beg Y. Ping
author_sort	A. McKelvey
title	Thermal conductivity measurements of proton-heated warm dense aluminum
title_short	Thermal conductivity measurements of proton-heated warm dense aluminum
title_full	Thermal conductivity measurements of proton-heated warm dense aluminum
title_fullStr	Thermal conductivity measurements of proton-heated warm dense aluminum
title_full_unstemmed	Thermal conductivity measurements of proton-heated warm dense aluminum
title_sort	thermal conductivity measurements of proton-heated warm dense aluminum
publisher	Nature Publishing Group
series	Scientific Reports
issn	2045-2322
publishDate	2017-08-01
description	Abstract 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.
url	https://doi.org/10.1038/s41598-017-07173-0
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Thermal conductivity measurements of proton-heated warm dense aluminum

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