The Hugoniot and chemistry of ablator plastic below 100 GPa

Akin, M. C.; Fratanduono, D. E.; Chau, R.

doi:10.1063/1.4940371

The Hugoniot and chemistry of ablator plastic below 100 GPa

Journal Article · Mon Jan 25 00:00:00 EST 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4940371· OSTI ID:1440723

Akin, M. C. ^[1]; Fratanduono, D. E. ^[1]; Chau, R. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1440723

Alternate ID(s):: OSTI ID: 1235802
OSTI ID: 22500478

Report Number(s):: LLNL-JRNL--671588; 783285

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 119; ISSN JAPIAU; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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