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Measurements of preheat and shock melting in Be ablators during the first few nanoseconds of a National Ignition Facility ignition drive using the Omega laser
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10.1063/1.3104702
/content/aip/journal/pop/16/4/10.1063/1.3104702
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/4/10.1063/1.3104702
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic showing the halfraum used in these experiments. The stepped foil is shown not to scale.

Image of FIG. 2.
FIG. 2.

Comparison of the measured (solid line), and simulated (dashed) as a function of time together with the proposed drives of Callahan et al. (Ref. 17) (dotted-dashed) and Wilson et al. (Ref. 7) (dotted).

Image of FIG. 3.
FIG. 3.

(a) Raw VISAR image recorded from stepped pure Be foil and (b) corresponding velocity histories measured from the three steps. (19.4, 36.1, and 50.6 ).

Image of FIG. 4.
FIG. 4.

Measured (dotted) and predicted (solid) foil surface velocities for a range of initial step thicknesses. From left: , , , , and .

Image of FIG. 5.
FIG. 5.

Predicted rear-surface temperatures corresponding to the samples shown in Fig. 4.

Image of FIG. 6.
FIG. 6.

Simulated temperature profiles and melt lines as a function of distance into the Be sample at 200 ps increments during the laser pulse. (a) During the first ns of the pulse, melting occurs due to radiation, (b) between 22 and melting starts to occur due to shock heating.

Image of FIG. 7.
FIG. 7.

Schematic of the stepped sample used to measure energy deposition in buried Cu-doped layers.

Image of FIG. 8.
FIG. 8.

Measured and simulated surface motion from the thick Be samples and the 0.35% Cu-doped steps. The vertical lines denote shock breakout. From left to right the curves are pure Be ( drive), BeCu ( drive), BeCu ( drive), and BeCu ( drive). The drive shots were with an increased -band (six additional Cone 3 beams were used with each beam having some overlap with the Cone 2 spots).

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/content/aip/journal/pop/16/4/10.1063/1.3104702
2009-04-13
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Measurements of preheat and shock melting in Be ablators during the first few nanoseconds of a National Ignition Facility ignition drive using the Omega laser
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/4/10.1063/1.3104702
10.1063/1.3104702
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