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Title: Absolute Hugoniot measurements for CH foams in the 2–9 Mbar range

Abstract

Absolute Hugoniot measurements for empty plastic foams at ~10% of solid polystyrene density and supporting rad-hydro simulation results are reported. Planar foam slabs, ~400 μm thick and ~500 μm wide, some of which were covered with a 10 μm solid plastic ablator, were directly driven by 4 ns long Nike krypton-fluoride 248 nm wavelength laser pulses that produced strong shock waves in the foam. The shock and mass velocities in our experiments were up to 104 km/s and 84 km/s, respectively, and the shock pressures up to ~9 Mbar. The motion of the shock and ablation fronts was recorded using side-on monochromatic x-ray imaging radiography. Here, the steadiness of the observed shock and ablation fronts within ~1% has been verified. The Hugoniot data inferred from our velocity measurements agree with the predictions of the SESAME and CALEOS equation-of-state models near the highest pressure ~9 Mbar and density compression ratio ~5. In the lower pressure range 2–5 Mbar, a lower shock density compression is observed than that predicted by the models. Possible causes for this discrepancy are discussed.

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [2]
  1. Naval Research Lab., Washington, D.C. (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (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:
1457361
Alternate Identifier(s):
OSTI ID: 1426845
Report Number(s):
SAND-2017-13815J
Journal ID: ISSN 1070-664X; 659683
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 3; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Aglitskiy, Y., Velikovich, A. L., Karasik, M., Schmitt, A. J., Serlin, V., Weaver, J. L., Oh, J., Obenschain, S. P., and Cochrane, K. R. Absolute Hugoniot measurements for CH foams in the 2–9 Mbar range. United States: N. p., 2018. Web. doi:10.1063/1.5020422.
Aglitskiy, Y., Velikovich, A. L., Karasik, M., Schmitt, A. J., Serlin, V., Weaver, J. L., Oh, J., Obenschain, S. P., & Cochrane, K. R. Absolute Hugoniot measurements for CH foams in the 2–9 Mbar range. United States. doi:10.1063/1.5020422.
Aglitskiy, Y., Velikovich, A. L., Karasik, M., Schmitt, A. J., Serlin, V., Weaver, J. L., Oh, J., Obenschain, S. P., and Cochrane, K. R. Mon . "Absolute Hugoniot measurements for CH foams in the 2–9 Mbar range". United States. doi:10.1063/1.5020422. https://www.osti.gov/servlets/purl/1457361.
@article{osti_1457361,
title = {Absolute Hugoniot measurements for CH foams in the 2–9 Mbar range},
author = {Aglitskiy, Y. and Velikovich, A. L. and Karasik, M. and Schmitt, A. J. and Serlin, V. and Weaver, J. L. and Oh, J. and Obenschain, S. P. and Cochrane, K. R.},
abstractNote = {Absolute Hugoniot measurements for empty plastic foams at ~10% of solid polystyrene density and supporting rad-hydro simulation results are reported. Planar foam slabs, ~400 μm thick and ~500 μm wide, some of which were covered with a 10 μm solid plastic ablator, were directly driven by 4 ns long Nike krypton-fluoride 248 nm wavelength laser pulses that produced strong shock waves in the foam. The shock and mass velocities in our experiments were up to 104 km/s and 84 km/s, respectively, and the shock pressures up to ~9 Mbar. The motion of the shock and ablation fronts was recorded using side-on monochromatic x-ray imaging radiography. Here, the steadiness of the observed shock and ablation fronts within ~1% has been verified. The Hugoniot data inferred from our velocity measurements agree with the predictions of the SESAME and CALEOS equation-of-state models near the highest pressure ~9 Mbar and density compression ratio ~5. In the lower pressure range 2–5 Mbar, a lower shock density compression is observed than that predicted by the models. Possible causes for this discrepancy are discussed.},
doi = {10.1063/1.5020422},
journal = {Physics of Plasmas},
number = 3,
volume = 25,
place = {United States},
year = {Mon Mar 19 00:00:00 EDT 2018},
month = {Mon Mar 19 00:00:00 EDT 2018}
}

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Works referenced in this record:

Direct-drive laser fusion: Status and prospects
journal, May 1998

  • Bodner, Stephen E.; Colombant, Denis G.; Gardner, John H.
  • Physics of Plasmas, Vol. 5, Issue 5, p. 1901-1918
  • DOI: 10.1063/1.872861