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 .
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.
(a) The OMEGA CH(Ge) hohlraum and shell design. (b) The OMEGA Be(Cu) hohlraum and shell design.
Experimental geometry for point projection radiography.
Measured soft x-ray radiation drive vs time for two nominally identical hohlraum shots equipped with -diameter shells. Error bar represents absolute systematic error.
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.
Legendre mode amplitude normalized to distance travelled () for the shell (black bars), shell (gray bars), and shell (white bars) data shown in Fig. 6.
Comparison of Legendre mode amplitude normalized to distance travelled () for two shots with nominally identical drive and shell parameters ( initial diameter).
Experimental geometry for area radiography.
(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.
Measured drive temperature through the LEH vs time for the three shots.
Example of an x-ray image of the backlighter as viewed from the back side at a 44° incidence angle.
Measured vs calculated average radius of the shells with (circles) and without (triangles) the effect of backlighter nonuniformity removed.
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.
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.
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.
(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.
(a) Angularly averaged reference and x-ray transmitted line-outs of the backlit Be thin shell. (b) Ratio of transmitted to reference line-out.
Comparison of measured vs calculated transmission limb.
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