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Precision equation-of-state measurements on National Ignition Facility ablator materials from 1 to 12 Mbar using laser-driven shock waves
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10.1063/1.4712050
/content/aip/journal/jap/111/9/10.1063/1.4712050
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/9/10.1063/1.4712050

Figures

Image of FIG. 1.
FIG. 1.

(a) Schematic of two material targets used in the experiments. Here, the OMEGA beams irradiate the target at 23° and 48° to target normal, with VISAR aligned and focused to the rear surface of the target. Multilayer planar targets were composed of a CH ablator, quartz standard, and two different samples (GDP and Ge-GDP) to be tested. (b) VISAR streak image corresponding to the bottom half of the target, containing data for GDP, shows continuous tracking of the shock front within the standard and material being tested. (c) Final shock-velocity measurements in quartz and GDP after data extraction and analysis. For the IM analysis, shock velocities are evaluated at t′.

Image of FIG. 2.
FIG. 2.

Principal Hugoniot measurements and models for GDP in U sU p plane. Data were obtained through the IM construct with quartz reference on GDP films with initial density ρ 0 = 1.06 (dark green diamonds), 1.05 (medium green diamonds), and 1.044 (light green diamonds) g/cm3.

Image of FIG. 3.
FIG. 3.

Principal Hugoniot data and models for GDP in P–ρ plane, with GDP film’s initial densities as previously described. Data are compared with CH SESAME 7592 (Ref. 30) and LEOS 5310 model, evaluated at initial density ρ 0 = 1.05 g/cm3. Random uncertainties are shown as green (smaller) error bars and total uncertainties (quadrature of random and systematic uncertainties) as the gray (larger) error bars.

Image of FIG. 4.
FIG. 4.

Principal Hugoniot measurements and models for Ge-GDP in U sU p plane. Data were obtained through the IM construct with quartz reference on Ge-GDP films with initial density ρ 0 = 1.13 g/cm3 (magenta circles, squares, and diamonds) and 1.1 g/cm3 (purple square), where circles, diamonds, and squares represent 0.7%, 0.66%, and 0.5% Ge doping. Measurements are compared with LEOS models 5312 (dashed purple) and 5315 (solid orange), assuming 0.2% and 0.5% Ge doping, respectively.

Image of FIG. 5.
FIG. 5.

Principal Hugoniot data and models for Ge-GDP in P–ρ plane, with Ge-GDP film initial densities and Ge doping as previously described. Data are compared with available Ge-GDP LEOS models, evaluated at an initial density ρ 0 = 1.13 g/cm3. Models used to compare the GDP data are included as reference. Random uncertainties are shown as the colored (smaller) error bars and total uncertainties (quadrature of random and systematic uncertainties) as the gray (larger) error bars.

Image of FIG. 6.
FIG. 6.

Ge-GDP results in the pressure–compression plane, with models and data as described in previous figures, showing structure observed in P–ρ plane is likely due to initial density variations.

Image of FIG. 7.
FIG. 7.

GDP and Ge-GDP results in the pressure–compression plane show these ablator materials reach similar compression states with increasing pressure. The measured behavior follows similar trends to that predicted by LEOS models. Models and data as described previously.

Image of FIG. 8.
FIG. 8.

Percent differences between quartz model predictions (from Refs. 8 and 18) in density and pressure, as a function of quartz shock velocity, are shown as the dashed blue and solid pink curves. Here, a positive number means that a higher value is predicted using laser quartz fit in comparison to Z-machine fit. Circles and squares represent percent differences in density and pressure between IM results, assuming a reflected Hugoniot to calculate release states in quartz (orange, light blue, green, and purple circles, and squares) and from inferred single-shock states using double-shock measurements (red circles and squares).

Tables

Generic image for table
Table I.

Material properties and associated errors at ambient conditions for ablator material films, as obtain for each batch. The shot numbers that used each of the batches are also indicated below.

Generic image for table
Table II.

Principal Hugoniot results for GDP using the IM technique with quartz reference. Measured shock velocity with error is given for both quartz (U s , Q) and GDP (U s , GDP). The resulting particle velocity (U p , GDP), pressure (P GDP), and density (ρ GDP) of shocked GDP are listed, with given random and systematic uncertainties. Random uncertainties enter the IM analysis through errors in shock-velocity measurements and initial density variations, while systematic errors stem from uncertainties in quartz’s principal Hugoniot and release states.

Generic image for table
Table III.

Initial density and stoichiometry for available LEOS models for GDP and Ge-GDP.

Generic image for table
Table IV.

Principal Hugoniot results for Ge-GDP using the IM technique with quartz reference. Measured shock velocities in quartz (U s , Q) and GDP (U s , GeGDP) are given with measured error. The resulting particle velocity (U p , GeGDP), pressure (P GeGDP), and density (ρ GeGDP) of shocked Ge-DP are listed with random and systematic uncertainties associated with each measurement. Random uncertainties enter the IM analysis through errors in shock-velocity measurements and initial density variations; systematic errors stem from uncertainties in quartz’s principal Hugoniot and release states.

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/content/aip/journal/jap/111/9/10.1063/1.4712050
2012-05-07
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Precision equation-of-state measurements on National Ignition Facility ablator materials from 1 to 12 Mbar using laser-driven shock waves
http://aip.metastore.ingenta.com/content/aip/journal/jap/111/9/10.1063/1.4712050
10.1063/1.4712050
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