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Numerical study of the ablative Richtmyer–Meshkov instability of laser-irradiated deuterium and deuterium-tritium targets
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10.1063/1.3505112
/content/aip/journal/pop/17/11/10.1063/1.3505112
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/11/10.1063/1.3505112

Figures

Image of FIG. 1.
FIG. 1.

Problem setup. (a) Target with surface corrugation, with amplitude ; (b) target with an inhomogeneous layer of thickness at distance from the target edge.

Image of FIG. 2.
FIG. 2.

Typical density profile of a laser-irradiated thick planar target. The laser impinges on the target from the right. The characteristic conduction zone length and the minimum density scale-length are highlighted.

Image of FIG. 3.
FIG. 3.

Time evolution of the characteristic lengths [frame (a)] and [frame (b)]. The graphs refer to a planar target and to three different laser intensities: , , and . In all simulations the flux limiter is set to .

Image of FIG. 4.
FIG. 4.

Ablative RMI evolution perturbation measured by (solid line) 2/3 perturbation normalized amplitude and (dashed line) areal mass density perturbation normalized amplitude. Simulations refer to a thick target with surface perturbation , and laser intensity .

Image of FIG. 5.
FIG. 5.

Ablative RMI evolution perturbation measured by two different techniques. (Solid line) 2/3 perturbation normalized amplitude and (dashed line) areal mass density perturbation normalized amplitude. Simulations refer to a thick target with an inhomogeneous layer.

Image of FIG. 6.
FIG. 6.

Ablation front perturbation evolution for different wavelengths, . Simulations refer to a thick target irradiated at , . The target is initialized with a surface amplitude roughness .

Image of FIG. 7.
FIG. 7.

Ablation front perturbation evolution, same as Fig. 6 but for longer wavelengths, .

Image of FIG. 8.
FIG. 8.

Ablation front perturbation evolution, same as Fig. 6 but for lower laser intensities: (a) and (b) .

Image of FIG. 9.
FIG. 9.

Ablation front perturbation evolution for thick targets with an inhomogeneous density mass layer at different depths, , respectively. The three cases refer to thick targets, perturbation wavelength , layer perturbation thickness , and laser intensity .

Image of FIG. 10.
FIG. 10.

Ablation front perturbation evolution for thick targets irradiated by different time-shaped laser pulses. All targets are initialized with surface corrugation with amplitude and wavelength of . (a) laser intensity and (b) ablation front perturbation evolution.

Image of FIG. 11.
FIG. 11.

Ablation front perturbation evolution for a thin and for a thick target irradiated by a shaped laser pulse. (a) Laser intensity vs time and (b) normalized amplitude evolution for perturbation wavelengths and . The solid line corresponds to the thick target case and the dashed line to the thin target described in the main text.

Image of FIG. 12.
FIG. 12.

Ablation front perturbation evolution for the same target and laser pulse as in Fig. 11, different perturbation amplitudes, , and the same initial surface perturbation roughness .

Image of FIG. 13.
FIG. 13.

Effect of adiabat-shaping laser pulses on ablation-front RMI. (a) Adiabat-shaping laser pulse with an initial picket and (b) evolution of ablation front perturbations with ; (dashed line) target driven by the adiabat-shaping pulse and (solid line) target driven by the reference pulse of Fig. 11(a).

Image of FIG. 14.
FIG. 14.

Ablation front perturbation evolution for the same slab target as in Figs. 11–13, irradiated by the laser pulse of Fig. 13(a). The figure refers to perturbation wavelengths and initial surface perturbation roughness .

Image of FIG. 15.
FIG. 15.

Hourglass instability diagram. The dots represent the cell centers where the pressure , the density , and the temperatures , are defined; and are the vertex coordinates.

Tables

Generic image for table
Table I.

Ablative RMI first oscillation periods obtained from 2D simulations and theoretical model.

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/content/aip/journal/pop/17/11/10.1063/1.3505112
2010-11-08
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Numerical study of the ablative Richtmyer–Meshkov instability of laser-irradiated deuterium and deuterium-tritium targets
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/11/10.1063/1.3505112
10.1063/1.3505112
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