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absorption spectroscopy of shock-wave heating and compression in laser-driven planar foil
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10.1063/1.3121217
/content/aip/journal/pop/16/5/10.1063/1.3121217
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/5/10.1063/1.3121217
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

A schematic of the absorption spectroscopy experiment showing a point-source Sm backlighter, a plastic drive foil with a buried Al layer, a Be blast shield, and a Bragg crystal spectrometer coupled to an x-ray streak camera.

Image of FIG. 2.
FIG. 2.

Simulated spatial profiles of electron temperature (dotted) and mass density (solid) during (a) shock-wave heating and (b) heat-front penetration. The Al absorption spectra simulated by postprocessing LILAC with SPECT3D are shown in (c) and (d). The prominent absorption features are identified.

Image of FIG. 3.
FIG. 3.

Measured streak images from (a) a CH foil with a buried Al layer and (b) a pure CH foil driven by the drive with a peak intensity of .

Image of FIG. 4.
FIG. 4.

(a) A measured spectrum during shock-wave heating (diamond) and fit (thick black curve) obtained in a least-squares-fitting routine to infer of 22 eV and of . (b) A measured spectrum during heat-front penetration and spectral analysis using two calculated spectra to determine upper and lower limits of for shot 48232. The modeled spectra are calculated with and for the lower limit (thin dashed black curve) and and for the upper limit (thin dotted black curve). The total modeled spectrum (thick solid black curve) is obtained by the product of the two spectra.

Image of FIG. 5.
FIG. 5.

Laser pulse shapes for (a) square pulse shapes (1 ns square and 3 ns square) and (b) shaped pulse shapes ( and ). The peak intensities for the square laser pulses are (dashed), (dotted), and (solid). For the drives, the peak intensities are (solid) and (dotted); for the drives, peak intensity is (dashed curve).

Image of FIG. 6.
FIG. 6.

Measured Al absorption spectra (diamonds) and fits (solid curve) during shock heating and compression for the square laser pulse drives having intensities of (a) , (b) , and (c) . The buried depth of an Al layer was for all three targets. The inferred condition from the fit is shown in each figure.

Image of FIG. 7.
FIG. 7.

Time-resolved electron temperatures in the buried Al layer inferred from the experiment (triangles) for a 1 ns square laser drive with an intensity of compared with the LILAC simulations using (dark gray), (black), and the nonlocal model (light gray). The depth of the buried Al layer was (a) , (b) , and (c) . The shock-breakout time from the rear surface of the target , calculated with the nonlocal model for this drive intensity, is indicated by the dotted vertical line in each figure.

Image of FIG. 8.
FIG. 8.

Time-resolved electron temperatures in the buried Al layer inferred from the experiment (triangles) for a 1 ns square laser drive with an intensity of for (a) and (b) buried depths. The data are compared with LILAC simulations using (dark gray), (black), and the nonlocal model (light gray). The shock-breakout time from the rear target surface is calculated with the nonlocal model for this drive intensity and is indicated by the dotted vertical line in each figure.

Image of FIG. 9.
FIG. 9.

Comparisons of time-resolved electron temperatures in the buried Al layer inferred from the experiment (triangles) for a 3 ns square laser drive with an intensity of with the LILAC simulations using (dark gray), (black), and the nonlocal model (light gray) for (a) and (b) buried depths. The shock-breakout time calculated with the nonlocal model for this drive intensity is indicated by the dotted vertical line in each figure.

Image of FIG. 10.
FIG. 10.

Comparisons of the measured electron temperatures in the buried Al layer (triangles) for the drive with peak intensity of with the LILAC simulations using (dark gray), (black), and the nonlocal model (light gray) for (a) , (b) , and (c) buried depths. The shock-breakout time calculated with the nonlocal model for this drive intensity is indicated by the dotted vertical line in each figure.

Image of FIG. 11.
FIG. 11.

Comparisons of the measured electron temperatures in the buried Al layer (triangles) for the drive with a peak intensity of with the LILAC simulations using (dark gray), (black), and the nonlocal model (light gray) for (a) and (b) buried depths. The shock-breakout time calculated with the nonlocal model for this drive intensity is indicated by the dotted vertical line in each figure.

Image of FIG. 12.
FIG. 12.

Measured (diamonds) and simulated Al absorption spectra before and after the shock-breakout time for the drives with a peak intensity of (shot 48 236). The fitted spectra assuming uniform conditions are shown in gray and LILAC/SPECT3D spectra in black.

Image of FIG. 13.
FIG. 13.

Mass-density contours of the driven CH/Al/CH planar target simulated with 2D hydrodynamics code DRACO for shot 48236 at (a) , (b) , and (c) . The calculation was performed with cylindrical symmetry around the horizontal axis and the laser is incident on the target from the right.

Image of FIG. 14.
FIG. 14.

(a) A comparison of the maximum coronal plasma temperatures predicted by 1D and 2D simulations for a planar CH/Al/CH target driven with the drive with a peak intensity of . (b) Time histories of predicted electron temperatures in the Al layer using LILAC and DRACO compared to the experimental data for shot 48236. The 1D, postprocessed is shown in black, and the minimum and maximum predicted temperatures with DRACO are shown in gray.

Image of FIG. 15.
FIG. 15.

Comparisons of the measured electron temperatures in the buried Al layer for the drive with LILAC simulations using (dark gray), (black), and the nonlocal model (light gray) for (a) , (b) , and (c) buried depths. The shock-breakout time calculated with the nonlocal model for this drive intensity is indicated by the dotted vertical line in each figure.

Image of FIG. 16.
FIG. 16.

Spectral fits (black curves) o the measured spectra for (a) a square laser pulse taken at and (b) shaped laser pulse ( drive) taken at 1.47 ns. Inferred mass densities from fitting the Stark-broadened absorptions are between (light gray) and (dark gray) for the square laser pulse and between (light gray) and (dark gray) for the shaped laser pulse. The modeled spectra for the best fit are shown in black.

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/content/aip/journal/pop/16/5/10.1063/1.3121217
2009-05-15
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Al 1s-2p absorption spectroscopy of shock-wave heating and compression in laser-driven planar foil
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/5/10.1063/1.3121217
10.1063/1.3121217
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