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Development of a polar direct-drive platform for studying inertial confinement fusion implosion mix on the National Ignition Facilitya)
a)Paper YI2 5, Bull. Am. Phys. Soc. , 370 (2012).
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Image of FIG. 1.
FIG. 1.

(a) Pie diagram of the nominal PDD CH capsules shot on NIF and (b) image of the capsule that incorporated an equatorial defect. The lighter rings in the image are from reflected light.

Image of FIG. 2.
FIG. 2.

Pre-shot simulated radiographs of the plain capsule implosion at fractional radii of (a) 0.75, (b) 0.50, (c) 0.25, and (d) full compression. Peak absorption varies from ∼10% in (a) to ∼50% in (d).

Image of FIG. 3.
FIG. 3.

(a) The schematic view for backlit and self-emission radiographs as observed from the equatorial diagnostic insertion manipulator (DIM) located at spherical coordinate angles (90°, 78°), (b) backlit radiograph from shot N120730 (1.5 mm × 1.5 mm image size) at 2.62 ns into the implosion of the capsule with the equatorial defect, and (c) x-ray self-emission image of the same capsule at 2.87 ns. The dark region to the right of the capsule in (b) is absorption from the fill tube that is observed entering from the target positioner located at angles (90°, 239°), 71° behind the plane of the image. Note the bright spots in the region of the defect in (b) and the dual bright spots at the edges of the defect in (c).

Image of FIG. 4.
FIG. 4.

Comparison of the HYDRA simulated capsule radius (thin-shell center of mass) versus time (green line) with discrete radii extracted from the x-ray images for shots N120728 (red circles) and N120730 (blue squares). Measurement error bars are shown for each point.

Image of FIG. 5.
FIG. 5.

Experimental (a) P asymmetry and (b) P asymmetry of the capsule compared to pre-shot predictions during the last half of the implosion. The P asymmetry is becoming more negative (oblate) as the capsule approaches minimum radius while the P asymmetry is increasing during this time.

Image of FIG. 6.
FIG. 6.

Self-emission images of the first PDD D-filled CH capsule implosion on NIF (N120728) at 2.9 ns as seen from (a) the equatorial DIM showing an offset of the upper and lower hemispheres, and (b) the polar DIM. The image frames are 0.75 mm square and the capsule is 320 m in diameter. In contrast to the equator-hot image in (a), the image in (c) shows the HYDRA simulated equatorial self-emission radiograph of this capsule where emission at the equator is predicted to be lower than the rest of the hot spot.

Image of FIG. 7.
FIG. 7.

(a) Log of the self-emission of shot N120728 as seen from the north pole of the NIF target chamber at 3.25 ns and (b) the 3-D simulated density contours from HYDRA at time 2.7 ns obtained using as-shot laser powers and improved laser spot sizes and skew prescription. The beams for the backlighter were removed from the direction where the bulge appears.


Generic image for table
Table I.

PDD laser pointing angles and defocus distances.

Generic image for table
Table II.

Comparison of predicted and experimental parameters for the two DIME shots.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Development of a polar direct-drive platform for studying inertial confinement fusion implosion mix on the National Ignition Facilitya)