The Hugoniot and chemistry of ablator plastic below 100 GPa

Journal Article · Thu Jan 28 04:00:00 EST 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4940371· OSTI ID:22500478

Fratanduono, D. E.; Chau, R. ^[1]

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1. Lawrence Livermore National Laboratory, Livermore, California 94550 (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. These changes also suggest other degradation mechanisms for inertial confinement fusion implosions.

• OSTI ID: 22500478
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 119; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHEMISTRY
COMPRESSIBILITY
COMPRESSION
EQUATIONS OF STATE
EVALUATION
EXPERIMENTAL DATA
GLOW DISCHARGES
IMPEDANCE
INERTIAL CONFINEMENT
PLASTICS
PRESSURE RANGE GIGA PA