Magnetically launched flyer plate technique for probing electrical conductivity of compressed copper

Cochrane, K. R.; Lemke, R. W.; Riford, Z.; Carpenter, J. H.

doi:10.1063/1.4943417

Title: Magnetically launched flyer plate technique for probing electrical conductivity of compressed copper

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Abstract

The electrical conductivity of materials under extremes of temperature and pressure is of crucial importance for a wide variety of phenomena, including planetary modeling, inertial confinement fusion, and pulsed power based dynamic materialsexperiments. There is a dearth of experimental techniques and data for highly compressed materials, even at known states such as along the principal isentrope and Hugoniot, where many pulsed power experiments occur. We present a method for developing, calibrating, and validating material conductivity models as used in magnetohydrodynamic(MHD) simulations. The difficulty in calibrating a conductivity model is in knowing where the model should be modified. Our method isolates those regions that will have an impact. It also quantitatively prioritizes which regions will have the most beneficial impact. Finally, it tracks the quantitative improvements to the conductivity model during each incremental adjustment. In this study, we use an experiment on Sandia National Laboratories Z-machine to isentropically launch multiple flyer plates and, with the MHD code ALEGRA and the optimization code DAKOTA, calibrated the conductivity such that we matched an experimental figure of merit to +/–1%.

Authors:

Cochrane, K. R.; Lemke, R. W.;

; Carpenter, J. H.

Publication Date:: Mon Mar 14 00:00:00 EDT 2016

Research Org.:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1241565

Alternate Identifier(s):: OSTI ID: 1241421; OSTI ID: 1251629

Report Number(s):: SAND-2015-10876J
Journal ID: ISSN 0021-8979

Grant/Contract Number:: AC04-94AL85000

Resource Type:: Published Article

Journal Name:: Journal of Applied Physics

Additional Journal Information:: Journal Name: Journal of Applied Physics Journal Volume: 119 Journal Issue: 10; Journal ID: ISSN 0021-8979

Publisher:: American Institute of Physics

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; velocity measurement; magnetic fields; electrical conductivity; density functional theory; experiment design

Citation Formats


                    Cochrane, K. R., Lemke, R. W., Riford, Z., and Carpenter, J. H. Magnetically launched flyer plate technique for probing electrical conductivity of compressed copper.  United States: N. p., 2016. 
Web.  doi:10.1063/1.4943417.

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                    Cochrane, K. R., Lemke, R. W., Riford, Z., & Carpenter, J. H. Magnetically launched flyer plate technique for probing electrical conductivity of compressed copper.  United States.  https://doi.org/10.1063/1.4943417

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                    Cochrane, K. R., Lemke, R. W., Riford, Z., and Carpenter, J. H. Mon .  
"Magnetically launched flyer plate technique for probing electrical conductivity of compressed copper".  United States.  https://doi.org/10.1063/1.4943417.

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@article{osti_1241565,

  title        = {Magnetically launched flyer plate technique for probing electrical conductivity of compressed copper},

  author       = {Cochrane, K. R. and Lemke, R. W. and Riford, Z. and Carpenter, J. H.},

  abstractNote = {The electrical conductivity of materials under extremes of temperature and pressure is of crucial importance for a wide variety of phenomena, including planetary modeling, inertial confinement fusion, and pulsed power based dynamic materialsexperiments. There is a dearth of experimental techniques and data for highly compressed materials, even at known states such as along the principal isentrope and Hugoniot, where many pulsed power experiments occur. We present a method for developing, calibrating, and validating material conductivity models as used in magnetohydrodynamic(MHD) simulations. The difficulty in calibrating a conductivity model is in knowing where the model should be modified. Our method isolates those regions that will have an impact. It also quantitatively prioritizes which regions will have the most beneficial impact. Finally, it tracks the quantitative improvements to the conductivity model during each incremental adjustment. In this study, we use an experiment on Sandia National Laboratories Z-machine to isentropically launch multiple flyer plates and, with the MHD code ALEGRA and the optimization code DAKOTA, calibrated the conductivity such that we matched an experimental figure of merit to +/–1%.},

  doi          = {10.1063/1.4943417},

  journal      = {Journal of Applied Physics},

  number       = 10,

  volume       = 119,

  place        = {United States},

  year         = {Mon Mar 14 00:00:00 EDT 2016},

  month        = {Mon Mar 14 00:00:00 EDT 2016}

}

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