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Title: Probing off-Hugoniot states in Ta, Cu, and Al to 1000 GPa compression with magnetically driven liner implosions

Abstract

We report on a new technique for obtaining off-Hugoniot pressure vs. density data for solid metals compressed to extreme pressure by a magnetically driven liner implosion on the Z-machine (Z) at Sandia National Laboratories. In our experiments, the liner comprises inner and outer metal tubes. The inner tube is composed of a sample material (e.g., Ta and Cu) whose compressed state is to be inferred. The outer tube is composed of Al and serves as the current carrying cathode. Another aluminum liner at much larger radius serves as the anode. A shaped current pulse quasi-isentropically compresses the sample as it implodes. The iterative method used to infer pressure vs. density requires two velocity measurements. Photonic Doppler velocimetry probes measure the implosion velocity of the free (inner) surface of the sample material and the explosion velocity of the anode free (outer) surface. These two velocities are used in conjunction with magnetohydrodynamic simulation and mathematical optimization to obtain the current driving the liner implosion, and to infer pressure and density in the sample through maximum compression. This new equation of state calibration technique is illustrated using a simulated experiment with a Cu sample. Monte Carlo uncertainty quantification of synthetic data establishes convergencemore » criteria for experiments. Results are presented from experiments with Al/Ta, Al/Cu, and Al liners. Symmetric liner implosion with quasi-isentropic compression to peak pressure ~1000 GPa is achieved in all cases. Lastly, these experiments exhibit unexpectedly softer behavior above 200 GPa, which we conjecture is related to differences in the actual and modeled properties of aluminum.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [1];  [3];  [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Washington State Univ., Pullman, WA (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1259836
Alternate Identifier(s):
OSTI ID: 1421087
Report Number(s):
SAND-2015-7246J
Journal ID: ISSN 0021-8979; JAPIAU; 604078
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 119; Journal Issue: 1; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; velocity measurement; free surface; aluminum; anodes; tantalum

Citation Formats

Lemke, R. W., Dolan, D. H., Dalton, D. G., Brown, J. L., Tomlinson, K., Robertson, G. R., Knudson, M. D., Harding, E., Mattsson, A. E., Carpenter, J. H., Drake, R. R., Cochrane, K., Blue, B. E., Robinson, A. C., and Mattsson, T. R. Probing off-Hugoniot states in Ta, Cu, and Al to 1000 GPa compression with magnetically driven liner implosions. United States: N. p., 2016. Web. doi:10.1063/1.4939675.
Lemke, R. W., Dolan, D. H., Dalton, D. G., Brown, J. L., Tomlinson, K., Robertson, G. R., Knudson, M. D., Harding, E., Mattsson, A. E., Carpenter, J. H., Drake, R. R., Cochrane, K., Blue, B. E., Robinson, A. C., & Mattsson, T. R. Probing off-Hugoniot states in Ta, Cu, and Al to 1000 GPa compression with magnetically driven liner implosions. United States. https://doi.org/10.1063/1.4939675
Lemke, R. W., Dolan, D. H., Dalton, D. G., Brown, J. L., Tomlinson, K., Robertson, G. R., Knudson, M. D., Harding, E., Mattsson, A. E., Carpenter, J. H., Drake, R. R., Cochrane, K., Blue, B. E., Robinson, A. C., and Mattsson, T. R. Thu . "Probing off-Hugoniot states in Ta, Cu, and Al to 1000 GPa compression with magnetically driven liner implosions". United States. https://doi.org/10.1063/1.4939675. https://www.osti.gov/servlets/purl/1259836.
@article{osti_1259836,
title = {Probing off-Hugoniot states in Ta, Cu, and Al to 1000 GPa compression with magnetically driven liner implosions},
author = {Lemke, R. W. and Dolan, D. H. and Dalton, D. G. and Brown, J. L. and Tomlinson, K. and Robertson, G. R. and Knudson, M. D. and Harding, E. and Mattsson, A. E. and Carpenter, J. H. and Drake, R. R. and Cochrane, K. and Blue, B. E. and Robinson, A. C. and Mattsson, T. R.},
abstractNote = {We report on a new technique for obtaining off-Hugoniot pressure vs. density data for solid metals compressed to extreme pressure by a magnetically driven liner implosion on the Z-machine (Z) at Sandia National Laboratories. In our experiments, the liner comprises inner and outer metal tubes. The inner tube is composed of a sample material (e.g., Ta and Cu) whose compressed state is to be inferred. The outer tube is composed of Al and serves as the current carrying cathode. Another aluminum liner at much larger radius serves as the anode. A shaped current pulse quasi-isentropically compresses the sample as it implodes. The iterative method used to infer pressure vs. density requires two velocity measurements. Photonic Doppler velocimetry probes measure the implosion velocity of the free (inner) surface of the sample material and the explosion velocity of the anode free (outer) surface. These two velocities are used in conjunction with magnetohydrodynamic simulation and mathematical optimization to obtain the current driving the liner implosion, and to infer pressure and density in the sample through maximum compression. This new equation of state calibration technique is illustrated using a simulated experiment with a Cu sample. Monte Carlo uncertainty quantification of synthetic data establishes convergence criteria for experiments. Results are presented from experiments with Al/Ta, Al/Cu, and Al liners. Symmetric liner implosion with quasi-isentropic compression to peak pressure ~1000 GPa is achieved in all cases. Lastly, these experiments exhibit unexpectedly softer behavior above 200 GPa, which we conjecture is related to differences in the actual and modeled properties of aluminum.},
doi = {10.1063/1.4939675},
journal = {Journal of Applied Physics},
number = 1,
volume = 119,
place = {United States},
year = {Thu Jan 07 00:00:00 EST 2016},
month = {Thu Jan 07 00:00:00 EST 2016}
}

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