Analysis of Z-pinch shock wave experiments on meteorite and planetary materials

Remo, John L.; Furnish, Michael D.

doi:10.1016/j.ijimpeng.2008.07.075

Cited by 8 publications

(14 citation statements)

References 9 publications

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“…As an alternative to shock experiments, high-pressure Brillouin scattering, which provides a measurement of the bulk mod-ulus, in conjunction with X-ray diffraction measurements of volume, can be integrated to provide an EOS, but a correction must be made to transfer from an adiabatic to an isothermal path [3]. New approaches such as quasi-adiabatic Z-pinch based experiments [4,5] also hold future promise for a primary scale. There have been attempts to refine the ruby scale [6], and new calibrations have also been suggested [3].…”

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confidence: 99%

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Fundamental High-Pressure Calibration from All-Electron Quantum Monte Carlo Calculations

et al. 2010

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We develop an all-electron quantum Monte Carlo (QMC) method for solids that does not rely on pseudopotentials, and use it to construct a primary ultra-high-pressure calibration based on the equation of state of cubic boron nitride. We compute the static contribution to the free energy with the QMC method and obtain the phonon contribution from density functional theory, yielding a high-accuracy calibration up to 900 GPa usable directly in experiment. We compute the anharmonic Raman frequency shift with QMC simulations as a function of pressure and temperature, allowing optical pressure calibration. In contrast to present experimental approaches, small systematic errors in the theoretical EOS do not increase with pressure, and no extrapolation is needed. This all-electron method is applicable to first-row solids, providing a new reference for ab initio calculations of solids and benchmarks for pseudopotential accuracy.

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confidence: 99%

“…where P 300K is the room-temperature contribution, fit to the Vinet form. The phonon contribution is written in an aug- mented Debye model, (5) in which the Debye temperature, θ, is a function of both V and T (Table I(b)). The Debye free energy per two-atom cell, excluding the zero-point term, is given by…”

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Fundamental High-Pressure Calibration from All-Electron Quantum Monte Carlo Calculations

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“…This is a continuation of earlier work [1,2] describing high energy density (HED) experiments measuring soft X-ray coupling to a variety of materials on the Sandia National Laboratories (SNL) Z-pinch facility, expanding the suite of materials and adding simulations. The overall motivation is to experimentally determine the impulses imparted by a known warm (~250 eV) Xray pulse onto representative solid astrophysical materials (iron meteorites, chondritic meteorites) and analogue materials (dunite, aluminum, iron and silicon), for purposes of NEO mitigation and understanding astrophysical impulses imparted by certain stellar events on nearby objects.…”

Section: Introductionmentioning

confidence: 75%

“…The experimental configuration in Figure 1 [2] uses samples ~1 mm thick, backed by transparent [100] LiF crystals that allow in-material optical access to VISAR diagnostics. Without such a window, experience has shown that VISAR velocimetry would not be successful for many of these samples.…”

Section: Experimental Methodsmentioning

confidence: 99%

Soft X-ray shock loading and momentum coupling in meteorite and planetary materials

Remo¹,

Furnish²,

Lawrence³

2012

AIP Conference Proceedings

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Abstract. X-ray momentum coupling coefficients, C M , were determined by measuring stress waveforms in planetary materials subjected to impulsive radiation loading from the SNL Z-machine. Targets were prepared from iron and stone meteorites, dunite (primarily magnesium rich olivine) in solid and powder forms (~5 -300 µm grains), and Si, Al, and Fe. All samples were ~1 mm thick and, except for Si, backed by LiF single-crystal windows. The spectra of the incident x-rays included thermal radiation (blackbody 170 -237 eV) and line emissions from the pinch material (Cu, Ni, Al, or stainless steel). Target fluences of 0.4 -1.7 kJ/cm 2 at intensities 43 -260 GW/cm 2 produced front surface plasma pressures of 2.6 -12.4 GPa. Stress waves driven into the samples were attenuating due to the short ~5 ns duration of the drive pulse. C M was determined using the fact that an attenuating wave impulse is constant, and accounted for the mechanical impedance mismatch between samples and window. Values ranged from 0.8 -3.1 x 10 -5 s/m. CTH hydrocode modeling of x-ray coupling to porous and fully dense silica corroborated experimental results and extrapolations to other materials.

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“…Other common minerals are schriebersite ( (Fe,Ni) 3 P), troilite (iron sulfite) nodules mixed with graphite, graphite nodules, and cohenite (iron carbide). Acoustic P and S wave velocity profiles for Odessa indicate wave propagation speeds corresponding to different material phases 2 . The Fe-Ni meteorite Hugoniot response is dominated by a single crystal kamacite phase with bulk octahedral properties.…”

Section: Appendix 1 Detailed Petrographic Descriptions Of Samplesmentioning

confidence: 99%

Soft x-ray shock loading and momentum coupling in meteorite and planetary materials.

Lawrence¹,

Remo

Furnish³

2010

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Analysis of Z-pinch shock wave experiments on meteorite and planetary materials

Cited by 8 publications

References 9 publications

Fundamental High-Pressure Calibration from All-Electron Quantum Monte Carlo Calculations

Fundamental High-Pressure Calibration from All-Electron Quantum Monte Carlo Calculations

Soft X-ray shock loading and momentum coupling in meteorite and planetary materials

Soft x-ray shock loading and momentum coupling in meteorite and planetary materials.

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