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Hohlraum energetics scaling to 520 TW on the National Ignition Facilitya)
a)Paper NI2 1, Bull. Am. Phys. Soc. , 200 (2012).
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10.1063/1.4803907
/content/aip/journal/pop/20/5/10.1063/1.4803907
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/5/10.1063/1.4803907

Figures

Image of FIG. 1.
FIG. 1.

Experimental setup for hohlraum driven capsule implosion experiments.

Image of FIG. 2.
FIG. 2.

Schematic diagrams for a DT capsule, nominal symcap, and the 20 m thicker symcap capsule used for the 520 TW shot.

Image of FIG. 3.
FIG. 3.

(a) Plot of the (–– gray) measured laser pulse, (- - - black) requested laser pulse, (–– blue) x-ray flux, and (––red) total backscatter. (b) Plot of the (- - - red) ignition power balance specification with the (–– green) measured power balance along with the (–– gray) measured laser pulse, (- - - black) requested laser pulse.

Image of FIG. 4.
FIG. 4.

Absorbed laser energy for a series of symcaps, convergent ablators with increasing (a) laser power and (b) laser energy. The (▪) 520 TW shot is highlighted, (○) all other shots have the same symbol.

Image of FIG. 5.
FIG. 5.

Measured average backscatter for SRS and SBS on the beam cones for 17 shots at 1.45 MJ, 420 TW with error bars indicating the standard deviation.

Image of FIG. 6.
FIG. 6.

(— black) Incident laser pulse, (— blue) total backscatter, (-·-·- red) 30° beam cone, (- - - red) 23° beam cone, and (— red) net incident power for (a) 350 TW, 1.5 MJ, (b) 520 TW, 1.85 MJ, (c) 420 TW, 1.3 MJ, and (d) 420 TW, 1.9 MJ.

Image of FIG. 7.
FIG. 7.

SRS backscattered spectra from the 30° beam cone for (a) 350 TW, 1.5 MJ, (b) 520 TW, 1.85 MJ, (c) 420 TW, 1.3 MJ, and (d) 420 TW, 1.9 MJ. The white line is at a wavelength of 600 nm.

Image of FIG. 8.
FIG. 8.

(a) Outer cone total SBS vs incident laser energy for nominal pulse shape and extended pulse shapes. (b) Comparison of the SBS time history on quad 36B (— blue) for two different pulse shapes (- - - blue) a nominal pulse shape (— black) and an extended pulse shape (- - - black).

Image of FIG. 9.
FIG. 9.

(a) Plot of the (◆) measured energy in hot electrons with energies greater than 170 keV up to the end of the laser pulse versus incident laser power along with their corresponding increase in (▪) adiabat. (b) (Top) Measured laser power for four different pulses with the corresponding (bottom) temporal history of the hot electrons.

Image of FIG. 10.
FIG. 10.

Radiation temperature for Au (□) and DU (gray circle) hohlraums as a function of absorbed laser energy for 420 ± 20 TW pulses. (●) is an exception with a 520 TW laser pulse with a DU hohlraum.

Image of FIG. 11.
FIG. 11.

Plot of the (—) laser power and the (- - -) measured Dante flux for three shots, (blue) N120609, (red) N120909, and (black) N120910.

Image of FIG. 12.
FIG. 12.

Plot of the (—) incident quad laser power for the (a) 23°, (b) 30°, and 50° quads along with the (- - -) measured backscatter for (a) 23° SRS, (b) 30° SRS, and 50° SBS from shots, N120609, N120909, and N120910.

Image of FIG. 13.
FIG. 13.

Self-emission images for the three symcap shots from the pole and the equator. The white line is the 17% contour.

Image of FIG. 14.
FIG. 14.

(a) Schematic showing the location of the fill tube for TARPOS (90-239). (b) N120906 symcap self-emission from the pole using TARPOS. (c) Schematic showing the location of the fill tube for Cryo-TARPOS (90-15), and (d) N120909 symcap self-emission from the pole using Cyro-TARPOS.

Tables

Generic image for table
Table I.

Hohlraum energetic data for the three symcap implosions.

Generic image for table
Table II.

RMS values of backscatter for 23° SRS, 30° SRS, and 50° SBS for the three reproducibility shots and all shots with 1.4 MJ of energy.

Generic image for table
Table III.

Measured Legendre coefficients for the three symcaps. The laser wavelength separation for the 30 beams was 6.6 Å and for the 23 beam was 8.1 Å relative to the outer cone beams. The last column shows variability.

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2013-05-17
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hohlraum energetics scaling to 520 TW on the National Ignition Facilitya)
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/5/10.1063/1.4803907
10.1063/1.4803907
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