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Title: The Hugoniot and chemistry of ablator plastic below 100 GPa

Abstract

The equation of state of glow discharge polymer (GDP) was measured to high precision using the two-stage light gas gun at Lawrence Livermore National Laboratory at pressures up to 70 GPa. Both absolute measurements and impedance matching techniques were used to determine the principal and secondary Hugoniots. GDP likely reacts at about 30 GPa, demonstrated by specific emission at 450 nm coupled with changes to the Hugoniot and reshock points. As a result of these reactions, the shock pressure in GDP evolves in time, leading to a possible decrease in pressure as compression increases, or negative compressibility, and causing complex pressure profiles within the plastic. Velocity wave profile variation was observed as a function of position on each shot, suggesting some internal variation of GDP may be present, which would be consistent with previous observations. The complex temporal and possibly structural evolution of GDP under shock compression suggests that calculations of compression and pressure based upon bulk or mean measurements may lead to artificially low pressures and high compressions. Evidence for this includes a large shift in calculating reshock pressures based on the reflected Hugoniot. In conclusion, these changes also suggest other degradation mechanisms for inertial confinement fusion implosions.

Authors:
 [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1440723
Alternate Identifier(s):
OSTI ID: 1235802
Report Number(s):
LLNL-JRNL-671588
Journal ID: ISSN 0021-8979; JAPIAU; 783285; TRN: US1900763
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 119; Journal Issue: 4; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Akin, M. C., Fratanduono, D. E., and Chau, R. The Hugoniot and chemistry of ablator plastic below 100 GPa. United States: N. p., 2016. Web. doi:10.1063/1.4940371.
Akin, M. C., Fratanduono, D. E., & Chau, R. The Hugoniot and chemistry of ablator plastic below 100 GPa. United States. doi:10.1063/1.4940371.
Akin, M. C., Fratanduono, D. E., and Chau, R. Mon . "The Hugoniot and chemistry of ablator plastic below 100 GPa". United States. doi:10.1063/1.4940371. https://www.osti.gov/servlets/purl/1440723.
@article{osti_1440723,
title = {The Hugoniot and chemistry of ablator plastic below 100 GPa},
author = {Akin, M. C. and Fratanduono, D. E. and Chau, R.},
abstractNote = {The equation of state of glow discharge polymer (GDP) was measured to high precision using the two-stage light gas gun at Lawrence Livermore National Laboratory at pressures up to 70 GPa. Both absolute measurements and impedance matching techniques were used to determine the principal and secondary Hugoniots. GDP likely reacts at about 30 GPa, demonstrated by specific emission at 450 nm coupled with changes to the Hugoniot and reshock points. As a result of these reactions, the shock pressure in GDP evolves in time, leading to a possible decrease in pressure as compression increases, or negative compressibility, and causing complex pressure profiles within the plastic. Velocity wave profile variation was observed as a function of position on each shot, suggesting some internal variation of GDP may be present, which would be consistent with previous observations. The complex temporal and possibly structural evolution of GDP under shock compression suggests that calculations of compression and pressure based upon bulk or mean measurements may lead to artificially low pressures and high compressions. Evidence for this includes a large shift in calculating reshock pressures based on the reflected Hugoniot. In conclusion, these changes also suggest other degradation mechanisms for inertial confinement fusion implosions.},
doi = {10.1063/1.4940371},
journal = {Journal of Applied Physics},
number = 4,
volume = 119,
place = {United States},
year = {2016},
month = {1}
}

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