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Optical transmission of glass for the National Ignition Facility near backscatter imagers under x-ray exposurea)
a)Contributed paper, published as part of the Proceedings of the 17th Topical Conference on High-Temperature Plasma Diagnostics, Albuquerque, New Mexico, May 2008.
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Image of FIG. 1.
FIG. 1.

This schematic diagram of the experimental layout at the Omega Laser Facility shows the glass sample as a vertical dashed line segment in front of the spherical mirror on the right. The diameter gold sphere is irradiated by 54 beams and emits nearly isotropic x rays. The probe beam passes through the sample twice. The transmitted beam and a reference picked off from B30 are relayed to a streak camera via optical fibers.

Image of FIG. 2.
FIG. 2.

Panels (a) and (c) show the time-resolved incident (dashed) and (two-pass) transmitted (solid) powers, in relative units. Panels (b) and (d) show the two-pass transmission of the sample (black), and the x-ray fluence at the sample. The top panels (a) and (b) are for the shot, while the bottom panels are for the shot.

Image of FIG. 3.
FIG. 3.

Panel (a) shows the recombination time-collisional rate parameter space for the absorption model, as constrained by the Omega data. The curve labeled “low-10%” gives the values that produce 10% absorption for the low-energy shot. All values below and to the left of this curve are consistent with the low-energy data. The “high-15%” and “high-25%” curves correspond to the minimum and maximum absorption values consistent with the high-energy shot data. The filled region shows the range of values of and allowed by the Omega data. Panel (b) shows the predicted absorption values of x-ray shields for , 192 beam NIF hohlraum shots, using the parameter constraints shown in panel (a). The lines and shading are the same as for panel (a). The range of predicted absorption values is 2%–11%.


Generic image for table
Table I.

Omega experimental parameters and data summary.

Generic image for table
Table II.

NIF Hohlraum parameters and predicted absorptivities.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical transmission of glass for the National Ignition Facility near backscatter imagers under x-ray exposurea)