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Sensitivity of ignition scale backlit thin-shell implosions to hohlraum symmetry in the foot of the drive pulse
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10.1063/1.3041160
/content/aip/journal/pop/16/1/10.1063/1.3041160
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/1/10.1063/1.3041160
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Figures

Image of FIG. 1.
FIG. 1.

Designs of ignition capsules (a) CH(Ge) and (b) Be(Cu). (c) Radiation drive vs time for the Be(Cu) case showing a four-shock structure with the first three shocks comprising the foot of the pulse which ends at .

Image of FIG. 2.
FIG. 2.

Ratio of asymmetry at capsule vs asymmetry at hohlraum wall (“smoothing factor”) vs asymmetry Legendre mode number for various ratios of capsule to hohlraum initial radii.

Image of FIG. 3.
FIG. 3.

(a) The OMEGA CH(Ge) hohlraum and shell design. (b) The OMEGA Be(Cu) hohlraum and shell design.

Image of FIG. 4.
FIG. 4.

Experimental geometry for point projection radiography.

Image of FIG. 5.
FIG. 5.

Measured soft x-ray radiation drive vs time for two nominally identical hohlraum shots equipped with -diameter shells. Error bar represents absolute systematic error.

Image of FIG. 6.
FIG. 6.

point projection radiographs of initially (a) , (b) , and (c) -diameter, -thick CH(Ge) shells after they have traveled a distance of . The hohlraum axis is horizontal and the white circles denote initial shell size.

Image of FIG. 7.
FIG. 7.

Legendre mode amplitude normalized to distance travelled () for the shell (black bars), shell (gray bars), and shell (white bars) data shown in Fig. 6.

Image of FIG. 8.
FIG. 8.

Comparison of Legendre mode amplitude normalized to distance travelled () for two shots with nominally identical drive and shell parameters ( initial diameter).

Image of FIG. 9.
FIG. 9.

Experimental geometry for area radiography.

Image of FIG. 10.
FIG. 10.

(a) Gated x-ray images of the backlit shell, at average times of 6.9, 7.15, 7.4, and corresponding to each of the four horizontal strips, and with four images on each strip with exposure times all within of the average value stated. [(b)–(d)] Magnified images at time for the three shots.

Image of FIG. 11.
FIG. 11.

Measured drive temperature through the LEH vs time for the three shots.

Image of FIG. 12.
FIG. 12.

Example of an x-ray image of the backlighter as viewed from the back side at a 44° incidence angle.

Image of FIG. 13.
FIG. 13.

Measured vs calculated average radius of the shells with (circles) and without (triangles) the effect of backlighter nonuniformity removed.

Image of FIG. 14.
FIG. 14.

Deviation of limb radius from average radius vs angle for each of four images on the same strip for (a) shot 49739 and (b) shot 49740.

Image of FIG. 15.
FIG. 15.

Legendre mode amplitudes vs mode number for inner cone energy fractions 0.3 (circles), 0.33 (squares), and 0.38 (triangles) with the error bars representing the standard error of the mean of the four images from each experiment.

Image of FIG. 16.
FIG. 16.

Measured vs calculated mode distortion as percentage of average distance traveled vs inner cone energy fraction, with (triangles) and without (circles) the effect of backlighter nonuniformity removed.

Image of FIG. 17.
FIG. 17.

(a) Example of backlit simulation of the converged thin shell and transmission at the experimental image time. (b) Line-outs of the transmission along cords through the pole and across the equator.

Image of FIG. 18.
FIG. 18.

(a) Angularly averaged reference and x-ray transmitted line-outs of the backlit Be thin shell. (b) Ratio of transmitted to reference line-out.

Image of FIG. 19.
FIG. 19.

Comparison of measured vs calculated transmission limb.

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/content/aip/journal/pop/16/1/10.1063/1.3041160
2009-01-06
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Sensitivity of ignition scale backlit thin-shell implosions to hohlraum symmetry in the foot of the drive pulse
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/1/10.1063/1.3041160
10.1063/1.3041160
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