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Title: Shocked silica aerogel radiance transition

Abstract

Silica (SiO2) aerogel is widely used in high-energy-density shock experiments due to its low and adjustable density. Reported here are measurements of the shock velocity, optical radiance, and reflectivity of shocked SiO2 aerogel with initial densities of 0.1, 0.2, and 0.3 g/cm3. These results are compared with similar data from three solid polymorphs of SiO2, silica, quartz, and stishovite with initial densities 2.2, 2.65, and 4.3 g/cm3, respectively. Interestingly, below a brightness temperature of Tbright ≈ 35,000 K, the slope of the radiance vs shock velocity is the same for each of the SiO2 aerogels and solid polymorphs. At Tbright ≈ 35000 K, there is an abrupt change in the radiance vs shock velocity slope for aerogels, but not seen in the solid polymorphs over the pressures and temperatures explored here. An empirical model of shock front radiance as a function of SiO2 density and laser drive parameters is reported to aid in the design of experiments requiring maximum shock front radiance.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [3];  [3]; ORCiD logo [1]
  1. University of Rochester, NY (United States)
  2. Sandia National Laboratory (SNL-NM), Albuquerque, NM (United States)
  3. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
2222565
Alternate Identifier(s):
OSTI ID: 1885071; OSTI ID: 1886337
Report Number(s):
LLNL-JRNL-856888
Journal ID: ISSN 0021-8979; 1086374
Grant/Contract Number:  
NA0003856; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 132; Journal Issue: 9; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; shock waves; optical properties; shock testing; photoexcitations; optical absorption; experiment design; polymorphism; aerogel

Citation Formats

Henderson, B. J., Rygg, J. R., Marshall, M. C., Ginane, M. K., Hansen, L. E., Davies, E., Celliers, P. M., and Collins, G W. Shocked silica aerogel radiance transition. United States: N. p., 2022. Web. doi:10.1063/5.0105194.
Henderson, B. J., Rygg, J. R., Marshall, M. C., Ginane, M. K., Hansen, L. E., Davies, E., Celliers, P. M., & Collins, G W. Shocked silica aerogel radiance transition. United States. https://doi.org/10.1063/5.0105194
Henderson, B. J., Rygg, J. R., Marshall, M. C., Ginane, M. K., Hansen, L. E., Davies, E., Celliers, P. M., and Collins, G W. Thu . "Shocked silica aerogel radiance transition". United States. https://doi.org/10.1063/5.0105194. https://www.osti.gov/servlets/purl/2222565.
@article{osti_2222565,
title = {Shocked silica aerogel radiance transition},
author = {Henderson, B. J. and Rygg, J. R. and Marshall, M. C. and Ginane, M. K. and Hansen, L. E. and Davies, E. and Celliers, P. M. and Collins, G W},
abstractNote = {Silica (SiO2) aerogel is widely used in high-energy-density shock experiments due to its low and adjustable density. Reported here are measurements of the shock velocity, optical radiance, and reflectivity of shocked SiO2 aerogel with initial densities of 0.1, 0.2, and 0.3 g/cm3. These results are compared with similar data from three solid polymorphs of SiO2, silica, quartz, and stishovite with initial densities 2.2, 2.65, and 4.3 g/cm3, respectively. Interestingly, below a brightness temperature of Tbright ≈ 35,000 K, the slope of the radiance vs shock velocity is the same for each of the SiO2 aerogels and solid polymorphs. At Tbright ≈ 35000 K, there is an abrupt change in the radiance vs shock velocity slope for aerogels, but not seen in the solid polymorphs over the pressures and temperatures explored here. An empirical model of shock front radiance as a function of SiO2 density and laser drive parameters is reported to aid in the design of experiments requiring maximum shock front radiance.},
doi = {10.1063/5.0105194},
journal = {Journal of Applied Physics},
number = 9,
volume = 132,
place = {United States},
year = {Thu Sep 01 00:00:00 EDT 2022},
month = {Thu Sep 01 00:00:00 EDT 2022}
}

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