Experimental setup for hohlraum driven capsule implosion experiments.
Schematic diagrams for a DT capsule, nominal symcap, and the 20 μm thicker symcap capsule used for the 520 TW shot.
(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.
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.
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.
(— 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.
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.
(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).
(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.
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.
Plot of the (—) laser power and the (- - -) measured Dante flux for three shots, (blue) N120609, (red) N120909, and (black) N120910.
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.
Self-emission images for the three symcap shots from the pole and the equator. The white line is the 17% contour.
(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.
Hohlraum energetic data for the three symcap implosions.
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.
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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