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NIF-scale re-emission sphere measurements of early-time hohlraum symmetry (invited)a)
a)Invited 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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View: Figures


Image of FIG. 1.
FIG. 1.

Re-emit setup for the future NIF ignition campaign.

Image of FIG. 2.
FIG. 2.

sensitivities to inner-to-outer beam cone fraction (represented as inner-to-total cone fraction) from view factor calculations for ignition and reemit targets with and without diagnostics patches (zero x-ray albedo) and missing beams.

Image of FIG. 3.
FIG. 3.

Re-emit flux transmitted through various filters and pinholes at re-emit temperature and corresponding centroid energies. All filters use pinholes except for Be which uses pinhole.

Image of FIG. 4.
FIG. 4.

Signal-to-noise ratio per resolution element (black) and the resulting and accuracies (red) for the (dashed lines) and (solid lines) channels vs NIF using the re-emit setup for NIF (Fig. 1) and a Planckian model. Overlapped are experimental signal-to-noise ratio points from Omega re-emit data for both (circles) and (triangles) channels. Inferred accuracy from and variations in the time interval are also plotted for an average of .

Image of FIG. 5.
FIG. 5.

Re-emit images recorded at ( exposure) for constant outer beams power (/beam) and variable inner cone power (0.19, 0.28, 0.4, and /beam) for both 900 and channels. Hohlraum axis is horizontal.

Image of FIG. 6.
FIG. 6.

dependence with the inner-to-outer laser power balance measured at for (circles) and (squares) channels.

Image of FIG. 7.
FIG. 7.

Experimental and time histories for (squares) and (circles) inner beam powers extracted from (solid lines) and (dashed lines) re-emit images (Fig. 5).

Image of FIG. 8.
FIG. 8.

(a) Hohlraum temperature increase vs inner beam power calculated for 100% outer beam coupling (conversion into x rays) at the wall and 50%, 75%, and 100% inner beam couplings. The points correspond to the experimental values obtained by Dante; (b) radiation flux measured by Dante (solid lines) for different inner beam powers as function of time. The circles are the view factor calculations assuming a 100% outer beam and 50% inner beam hohlraum wall coupling.

Image of FIG. 9.
FIG. 9.

Experimental and simulated re-emit images at using 50% inner beam and 100% outer beam coupling.

Image of FIG. 10.
FIG. 10.

inferred from images (Fig. 5) recorded in the time interval (points) and calculated for 100% outer beam coupling and 50%, 75%, 100% inner beam couplings (lines) at 900 and photon energie


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: NIF-scale re-emission sphere measurements of early-time Tr=100eV hohlraum symmetry (invited)a)