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Hard x-ray imaging for measuring laser absorption spatial profiles on the National Ignition Facility
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Image of FIG. 1.
FIG. 1.

(Color online) (a) Omega multicone laser illumination and (b) comparison of measured and analytic x-ray flux ratio estimate vs cone angle for 59° and 42° beams.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Time integrated x-ray emission measured in Omega implosion experiments and (b) gated thin wall images and x-ray intensity vs laser intensity recorded during first NIF hohlraum experiments.

Image of FIG. 3.
FIG. 3.

(Color online) 2D LASNEX calculations of ICF design with LEH shields: (a) total laser power in the inner and the outer cones and (b) calculated inner (solid lines) and outer (dashed lines) cone x-ray emission vs time: unfiltered and transmitted through cocktail wall; (c) postprocessed x-ray emission in the hohlraum for two times during the ICF pulse.

Image of FIG. 4.
FIG. 4.

(Color online) Dynamics of thin wall hohlraum wall heated by ICF-like x-ray drive calculated with 1D LASNEX; while burn through occurs for cocktail wall at the end of the drive , the radiation is fully confined for wall.


Generic image for table
Table I.

Photometrics and accuracies for future NIF-ICF hohlraums using 2D LASNEX emissivities.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hard x-ray imaging for measuring laser absorption spatial profiles on the National Ignition Facility