Shockwave compression of Ar gas at several initial densities

Dattelbaum, Dana M.; Goodwin, Peter M.; Garcia, Daniel J.; Gustavsen, R. L.; Lang, John M.; Aslam, Tariq D.; Sheffield, S. A.; Gibson, L. L.; Morris, John S.

doi:10.1063/1.4971623

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…In the plasma physics and shock physics communities velocity measurements are typically made on shock compressed materials and gases over a wide range of pressures. These pressures range from MPa for plate impact experiments on noble gases [10] to TPa for shock compression of MgO [11]. These velocities are typically measured with two techniques: velocity interferometer system for any reflector (VISAR) [12,13] and photonic Doppler velocimetry (PDV) [14].…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic disassembly and expansion of electron-beam-heated warm dense copper

et al. 2018

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Cu foils, 200 µm in thickness, were heated in two stages by a ∼100-ns-long mono-energetic electron bunch at 19.8 MeV and a current of 1.7 kA (8.5×10 14 e-) in a 2-mm-spot to Te ∼ 1 eV. After 45 ns of isochoric heating the pressure in the foil builds upto >20 GPa (200 kbar), it begins to hydrodynamically disassemble, and a velocity spread is measured. Near the end of the electron pulse the 1550 nm probe is cutoff or absorbed. Photonic doppler velocimetry measurements were made to quantify the expansion velocity, hydrodynamic disassembly time, and pressure of the foil prior to cutoff. Measurements indicate foil motion begins the instant electrons pass through the foil and continues until the particle velocity approaches the ambient sound velocity of Cu and the bulk density exceeds the critical density of the probe. Once the density of the plasma drops below the critical threshold and begins reflecting again, an expansion velocity of the classical plasma is also measured, similar to the point-source solution.

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Section: Introductionmentioning

confidence: 99%

“…PDV has been used to measure initial shocks and flyer plates in gas gun experiments [10,14,17]. Ref.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic disassembly and expansion of electron-beam-heated warm dense copper

et al. 2018

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Shock-driven reactions in acrylonitrile

Goodwin¹,

Dattelbaum²,

Sheffield³

et al. 2018

AIP Conference Proceedings

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Shockwave compression and dissociation of ammonia gas

Dattelbaum

Lang

Goodwin

et al. 2019

The Journal of Chemical Physics

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We performed a series of plate impact experiments on NH3 gas initially at room temperature and at a pressure of ∼100 psi. Shocked states were determined by optical velocimetry and the temperatures by optical pyrometry, yielding compression ratios of ∼5–10 and second shock temperatures in excess of 7500 K. A first-principles statistical mechanical (thermochemical) approach that included chemical dissociation yielded reasonable agreement with experimental results on the principal Hugoniot, even with interparticle interactions neglected. Theoretical analysis of reshocked states, which predicts a significant degree of chemical dissociation, showed reasonable agreement with experimental data for higher temperature shots; however, reshock calculations required the use of interaction potentials. We rationalize the very different shock temperatures obtained, relative to previous results for argon, in terms of atomic versus molecular heat capacities.

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Shockwave compression of Ar gas at several initial densities

Cited by 4 publications

References 22 publications

Hydrodynamic disassembly and expansion of electron-beam-heated warm dense copper

Hydrodynamic disassembly and expansion of electron-beam-heated warm dense copper

Shock-driven reactions in acrylonitrile

Shockwave compression and dissociation of ammonia gas

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