Shock Compression of Solid Argon

Dick, Richard D.; Warnes, R. H.; Skalyo, J.

doi:10.1063/1.1674238

Cited by 33 publications

(9 citation statements)

References 15 publications

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“…The blue line is a fit of the two data sets to Eq. 3 and 75 K with data shown on the left as red squares [31]. The liquid initial state is at 1.4 g/cm 3 and 86 K with data shown on the right as red squares [18], green circles [32], blue triangles [33], magenta inverted triangles for the Z data, and gray exes and pluses for the AM05 and LDA DFT calculations, respectively.…”

Section: Compression Datamentioning

confidence: 99%

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Equation of state of argon : experiments on Z, density functional theory (DFT) simulations, and wide-range model.

Carpenter¹,

Root²,

Cochrane³

et al. 2012

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Over the last few years, first-principles simulations in combination with increasingly accurate shock experiments at multi-Mbar pressure have yielded important insights into how matter behaves under shock loading. Noble gases like argon are particularly interesting to study as a model system due to the closed shell electronic structure that results in a weak interatomic interaction at normal conditions followed by pronounced ionization and strong interaction under compression. Cryogenic argon is also optically transparent while shocked argon is metallic, displaying a reflective shock front, thus allowing for shock velocity measurement to very high precision. In this report, we present experimental results for shock compression of liquid cryogenic argon to several Mbar using magnetically accelerated flyers on the Z machine, first-principles simulations based on Density Functional Theory, and an analysis of tabular equations of state (EOS) for argon, including a newly developed wide-range EOS model. 3 AcknowledgmentWe sincerely thank the many devoted specialists with Z-Operations who are involved in planning and executing experiments on the Z-machine. We thank the cryogenic team: Andrew Lopez, Keegan Shelton, and Jose Villalva for installing and running the cryostat. We thank Aaron Bowers, Nicole Cofer, and Jesse Lynch for assembling the cryo-targets. We thank Charlie Meyers for running the VISAR diagnostics and Devon Dalton for handling target design.4

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Section: Compression Datamentioning

confidence: 99%

“…The solid shock compression data was taken from Ref. [31] and the liquid data from Refs. [18,32,33] as well as the Z data from Ch.…”

Section: Compression Datamentioning

confidence: 99%

Equation of state of argon : experiments on Z, density functional theory (DFT) simulations, and wide-range model.

Carpenter¹,

Root²,

Cochrane³

et al. 2012

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“…Argon is usually considered as a model substance in WDM region, whose experimental data of EOSs can be used to test and verify the theoretical models. For the purpose, existing experiments reveal that the principal Hugoniot measurements of solid 8 and liquid 9 10 argon have been performed, and liquid argon has been single-shocked up to the pressure of 91 GPa. The single-shock data were reproduced by a fluid variational theory 11 , which did not include the ionization effect.…”

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confidence: 99%

Multishock Compression Properties of Warm Dense Argon

Zheng¹,

Chen²,

Gu³

et al. 2015

Sci Rep

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Warm dense argon was generated by a shock reverberation technique. The diagnostics of warm dense argon were performed by a multichannel optical pyrometer and a velocity interferometer system. The equations of state in the pressure-density range of 20–150 GPa and 1.9–5.3 g/cm3 from the first- to fourth-shock compression were presented. The single-shock temperatures in the range of 17.2–23.4 kK were obtained from the spectral radiance. Experimental results indicates that multiple shock-compression ratio (ηi = ρi/ρ0) is greatly enhanced from 3.3 to 8.8, where ρ0 is the initial density of argon and ρi (i = 1, 2, 3, 4) is the compressed density from first to fourth shock, respectively. For the relative compression ratio (ηi’ = ρi/ρi-1), an interesting finding is that a turning point occurs at the second shocked states under the conditions of different experiments, and ηi’ increases with pressure in lower density regime and reversely decreases with pressure in higher density regime. The evolution of the compression ratio is controlled by the excitation of internal degrees of freedom, which increase the compression, and by the interaction effects between particles that reduce it. A temperature-density plot shows that current multishock compression states of argon have distributed into warm dense regime.

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“…The majority of historical shockwave compression experiments on Ar have been of the cryogenic liquefied (ρ 0 = 1.4 g/cm 3 at 87 K) or solid (ρ 0 = 1.65 g/cm 3 at 77 K) phases, which have different EOS surfaces and ionization thresholds when compared with gas-phase Ar [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. By far, the most extensive Hugoniot data on Ar is of the cryogenic liquefied gas at ρ 0 = 1.4 g/cm 3 and 87 K [10][11]. These data were recently extended into the multi-Mbar regime using magnetically-launched flyers at the Sandia Z-machine [12].…”

Section: Introductionmentioning

confidence: 99%

“…More recently, density functional theory calculations were used to calculate the static lattice at high densities (ρ =6-20 g/cm 3 ), with extrapolation of the cold curve to a Thomas-Fermi-Dirac infinite limit to address deficiencies in Sesame 5172 [3,4]. The majority of historical shockwave compression experiments on Ar have been of the cryogenic liquefied (ρ 0 = 1.4 g/cm 3 at 87 K) or solid (ρ 0 = 1.65 g/cm 3 at 77 K) phases, which have different EOS surfaces and ionization thresholds when compared with gas-phase Ar [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. By far, the most extensive Hugoniot data on Ar is of the cryogenic liquefied gas at ρ 0 = 1.4 g/cm 3 and 87 K [10][11].…”

Section: Introductionmentioning

confidence: 99%

Shockwave compression of Ar gas at several initial densities

Dattelbaum

Goodwin

Garcia

et al. 2017

AIP Conference Proceedings

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Abstract. Experimental data of the principal Hugoniot locus of variable density gas-phase noble and molecular gases are rare. The majority of shock Hugoniot data is either from shock tube experiments on low-pressure gases or from plate impact experiments on cryogenic, liquefied gases. In both cases, physics regarding shock compressibility, thresholds for the on-set of shock-driven ionization, and even dissociation chemistry are difficult to infer for gases at intermediate densities. We have developed an experimental target design for gas gun-driven plate impact experiments on noble gases at initial pressures between 200-1000 psi. Using optical velocimetry, we are able to directly determine both the shock and particle velocities of the gas on the principal Hugoniot locus, as well as clearly differentiate ionization thresholds. The target design also results in multiply shocking the gas in a quasi-isentropic fashion yielding off-Hugoniot compression data. We describe the results of a series of plate impact experiments on Ar with starting densities between 0.02-0.05 g/cm 3 at room temperature. Furthermore, by coupling optical fibers to the targets, we have measured the time-resolved optical emission from the shocked gas using a spectrometer coupled to an optical streak camera to spectrally-resolve the emission, and with a 5-color optical pyrometer for temperature determination.

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Shock Compression of Solid Argon

Cited by 33 publications

References 15 publications

Equation of state of argon : experiments on Z, density functional theory (DFT) simulations, and wide-range model.

Equation of state of argon : experiments on Z, density functional theory (DFT) simulations, and wide-range model.

Multishock Compression Properties of Warm Dense Argon

Shockwave compression of Ar gas at several initial densities

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