Theory and experiment for ultrahigh pressure shock Hugoniots

Rozsnyai, Balazs F.; Albritton, J. R.; Young, David A.; Sonnad, V.; Liberman, David A.

doi:10.1016/s0375-9601(01)00661-2

Cited by 50 publications

(24 citation statements)

References 17 publications

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“…In fact, at shock pressures above ϳ300-400 GPa, shock temperatures become so large that thermal pressures become much larger than on the 300 K isotherm and limit shock compression to approximately four fold of the initial density. 44 In contrast, temperatures and thermal pressures achieved by dynamic quasi-isentropic compression are substantially lower than on the Hugoniot and isentropic compression does not have such a fundamental limit. Thus, reductions of experimentally determined isentropes to isotherms might well be the most accurate way to develop standards for static pressures above 200 GPa.…”

Section: Shock and Isentropic Compressionmentioning

confidence: 98%

The ruby pressure standard to 150GPa

Chijioke

Nellis

Солдатов

et al. 2005

Journal of Applied Physics

248

173

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A determination of the ruby high-pressure scale is presented using all available appropriate measurements including our own. Calibration data extend to 150 GPa. A careful consideration of shock-wave-reduced isotherms is given, including corrections for material strength. The data are fitted to the calibration equation P = ͑A / B͓͒͑ / 0 ͒ B −1͔ ͑GPa͒, with A = 1876± 6.7, B = 10.71± 0.14, and is the peak wavelength of the ruby R1 line.

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Section: Shock and Isentropic Compressionmentioning

confidence: 98%

The ruby pressure standard to 150GPa

Chijioke

Nellis

Солдатов

et al. 2005

Journal of Applied Physics

248

173

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“…This gives a strong support to the physical picture that the origin of the "bump" in the deuterium Hugoniot curve is the dissociation of D 2 molecules. Usually, the "bump" structure in the principal Hugoniot is the result of ionization of multi-shell electrons 47,48 . However, it has a slightly different origin in the principal Hugoniot curve of D 2 .…”

Section: Molecular Dissociation and Ionization At The Shock Frontmentioning

confidence: 99%

Molecular dynamics simulation of strong shock waves propagating in dense deuterium, taking into consideration effects of excited electrons

et al. 2017

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We present a molecular dynamics simulation of shock waves propagating in dense deuterium with the electron force field method [J. T. Su and W. A. Goddard, Phys. Rev. Lett. 99, 185003 (2007)], which explicitly takes the excitation of electrons into consideration. Non-equilibrium features associated with the excitation of electrons are systematically investigated. We show that chemical bonds in D 2 molecules lead to a more complicated shock wave structure near the shock front, compared with the results of classical molecular dynamics simulation. Charge separation can bring about accumulation of net charges on the large scale, instead of the formation of a localized dipole layer, which might cause extra energy for the shock wave to propagate. In addition, the simulations also display that molecular dissociation at the shock front is the major factor corresponding to the "bump" structure in the principal Hugoniot. These results could help to build a more realistic picture of shock wave propagation in fuel materials commonly used in the inertial confinement fusion.

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“…In the range of 100 to 2000 GPa (dashed line in Fig. 13), Ross and Rogers interpolated their Hugoniot curve based on a collection of previous ACTEX calculations for other light elements 62 and available experimental data below 100 GPa 7 . Therefore, it is not too surprising that PIMC and the analytic model disagree by up to 20% in the pressure.…”

Section: Hugoniot Relationmentioning

confidence: 99%

First-principles equation of state calculations of warm dense nitrogen

Driver¹,

Militzer²

2016

Phys. Rev. B

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Using path integral Monte Carlo (PIMC) and density functional molecular dynamics (DFT-MD) simulation methods, we compute a coherent equation of state (EOS) of nitrogen that spans the liquid, warm dense matter (WDM), and plasma regimes. Simulations cover a wide range of densitytemperature space, 1.5 − 13.9 g cm −3 and 10 3 − 10 9 K. In the molecular dissociation regime, we extend the pressure-temperature phase diagram beyond previous studies, providing dissociation and Hugoniot curves in good agreement with experiments and previous DFT-MD work. Analysis of paircorrelation functions and the electronic density of states in the WDM regime reveals an evolving plasma structure and ionization process that is driven by temperature and pressure. Our Hugoniot curves display a sharp change in slope in the dissociation regime and feature two compression maxima as the K and L shells are ionized in the WDM regime, which have some significant differences from the predictions of plasma models.

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Theory and experiment for ultrahigh pressure shock Hugoniots

Cited by 50 publications

References 17 publications

The ruby pressure standard to 150GPa

The ruby pressure standard to 150GPa

Molecular dynamics simulation of strong shock waves propagating in dense deuterium, taking into consideration effects of excited electrons

First-principles equation of state calculations of warm dense nitrogen

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