Progress on LMJ targets for ignition

Cherfils-Clérouin, C.; Boniface, C.; Bonnefille, Max; Fremerye, P.; Galmiche, D.; Gauthier, P.; Giorla, J.; Lambert, F. Hugo; Laffite, S.; Liberatore, S.; Loiseau, P.; Malinie, G.; Massé, L.; Masson-Laborde, P. E.; Monteil, M. C.; Poggi, F.; Seytor, P.; Wagon, F.; Willien, J.-L.

doi:10.1088/1742-6596/244/2/022009

Cited by 17 publications

(17 citation statements)

References 6 publications

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“…The electron temperature is around 0.8 keV close to the value deduced from the experimental SBS spectrum. The simulated SBS spectrum calculated with the linear gain postprocessor Piranah, along the rays of the ray-tracing simulations 25 is illustrated in Figure 4(c). As we can see, we observe an initial redshift (around (7 6 1) Å ) as in the experimental spectrum, but in the linear analysis, we do not see the blue shift component of À4 Å observed in the experiment.…”

Section: B Numerical Simulationsmentioning

confidence: 99%

Reduction of stimulated Brillouin backscattering with plasma beam smoothing

et al. 2015

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Plasma induced incoherence (PII) can strongly modify the growth rates of stimulated scattering instabilities. A special double-target design was used to quantify the effect of PII on stimulated Brillouin scattering (SBS). Successive shots using all or part of these targets led to the characterization of temporal and spatial incoherence of a laser pulse after propagation through a foam plasma and to the quantification of the reduction of SBS from the second target. Numerical simulations were used to identify the main physical mechanisms in play. V C 2015 AIP Publishing LLC.

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Section: B Numerical Simulationsmentioning

confidence: 99%

Reduction of stimulated Brillouin backscattering with plasma beam smoothing

et al. 2015

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“…Moreover, silicon has also been used as a dopant to the ablator material for target designs in inertial confinement fusion (ICF) [5][6][7], as well as for mitigating laser-imprint [8,9] and two-plasmon-decay effects [10] in direct-drive ICF.…”

Section: Introductionmentioning

confidence: 99%

First-principles prediction of the softening of the silicon shock Hugoniot curve

Militzer

Collins

et al. 2016

Phys. Rev. B

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Shock compression of silicon (Si) under extremely high pressures (>100 Mbar) was investigated by using two first-principles methods of orbital-free molecular dynamics (OFMD) and path integral Monte Carlo (PIMC). While pressures from the two methods agree very well, PIMC predicts a second compression maximum because of 1s electron ionization that is absent in OFMD calculations since Thomas-Fermi-based theories lack shell structure. The Kohn-Sham density functional theory is used to calculate the equation of state (EOS) of warm dense silicon for low-pressure loadings (P < 100 Mbar).Combining these first-principles EOS results, the principal shock Hugoniot curve of 2 silicon for pressures varying from ~1 Mbar to above ~10 Gbar was derived. We find that silicon is ~20% or more softer than what was predicted by widely-used EOS models.Existing high-pressure experimental data (P ≈ 1 − 2 Mbar) seem to indicate this softening behavior of Si, which calls for future strong-shock experiments (P > 10 Mbar) to benchmark our results.

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“…At OMEGA scale backscattering losses are not very different in cylinders and rugby hohlraum. At MJ scale LPI in rugby hohlraum is an open question but various mitigation options are available including hohlraum wall shape [2,4]. The energetics benefit of rugby-shaped hohlraum could be useful either to increase the x-ray drive (and so favor higher capsule implosion velocity) for the same laser power, to achieve the same drive at reduced laser power or for high-gain target designs [13].…”

Section: Discussionmentioning

confidence: 99%

“…Point designs for ignition requires radiation temperature at 300 eV level [4,10]. A way to achieve such high radiation temperatures on OMEGA is to work with reduced scale empty hohlraums.…”

Section: Demonstration Of Ignition Radiation Temperatures In Reduced mentioning

confidence: 99%

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Progress of LMJ-relevant implosions experiments on OMEGA

Casner

Philippe

Tassin

et al. 2013

EPJ Web of Conferences

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Abstract. In preparation of the first ignition attempts on the Laser Mégajoule (LMJ), an experimental program is being pursued on OMEGA to investigate LMJ-relevant hohlraums. First, radiation temperature levels close to 300 eV were recently achieved in reduced-scale hohlraums with modest backscatter losses. Regarding the baseline target design for fusion experiments on LMJ, an extensive experimental database has also been collected for scaled implosions experiments in both empty and gas-filled rugby-shaped hohlraums. We acquired a full picture of hohlraum energetics and implosion dynamics. Not only did the rugby hohlraums show significantly higher x-ray drive energy over the cylindrical hohlraums, but symmetry control by power balance was demonstrated, as well as high-performance D 2 implosions enabling the use of a complete suite of neutrons diagnostics. Charged particle diagnostics provide complementary insights into the physics of these x-ray driven implosions. An overview of these results demonstrates our ability to control the key parameters driving the implosion, lending more confidence in extrapolations to ignitionscale targets.

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Progress on LMJ targets for ignition

Cited by 17 publications

References 6 publications

Reduction of stimulated Brillouin backscattering with plasma beam smoothing

Reduction of stimulated Brillouin backscattering with plasma beam smoothing

First-principles prediction of the softening of the silicon shock Hugoniot curve

Progress of LMJ-relevant implosions experiments on OMEGA

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