Prolate-Spheroid (“Rugby-Shaped”) Hohlraum for Inertial Confinement Fusion

Vandenboomgaerde, M.; Bastian, Johannes Dominik; Casner, A.; Galmiche, D.; Jadaud, J. P.; Laffite, S.; Liberatore, S.; Malinie, G.; Philippe, F.

doi:10.1103/physrevlett.99.065004

Cited by 60 publications

(24 citation statements)

References 20 publications

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“…The vast majority of previous experiments employed hohlraums of cylindrical shape. [1][2][3] Recently, there has been increasing interest in hohlraums of an elliptical or "rugby" shape, [4][5][6][7] as this design provides the possibility of reduced energy losses into the wall and therefore enhanced radiation drive for a given laser energy input. These hohlraums are currently being investigated for a number of inertial confinement fusion applications.…”

Section: Introductionmentioning

confidence: 99%

High performance capsule implosions on the OMEGA Laser facility with rugby hohlraums

et al. 2010

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Rugby-shaped hohlraums have been proposed as a method for x-ray drive enhancement for indirectly driven capsule implosions. This concept has recently been tested in a series of shots on the OMEGA laser facility ͓T. R. Boehly, D. L. Brown, R. S. Craxton et al., Opt. Commun. 133, 495 ͑1997͔͒. In this paper, experimental results are presented comparing the performance of D 2 -filled capsules between standard cylindrical Au hohlraums and rugby-shaped hohlraums. The rugby hohlraums demonstrated 18% more x-ray drive energy as compared with the cylinders, and the high-performance design of these implosions ͑both cylinder and rugby͒ also provided Ϸ20ϫ more deuterium ͑DD͒ neutrons than any previous indirectly driven campaign on OMEGA and Ϸ3ϫ more than ever achieved on NOVA ͓E. M. Campbell, Laser Part. Beams 9, 209 ͑1991͔͒ implosions driven with nearly twice the laser energy. This increase in performance enables, for the first time, a measurement of the neutron burn history and imaging of the neutron core shapes in an indirectly driven implosion. Previous DD neutron yields had been too low to register this key measurement of capsule performance and the effects of dynamic mix. A wealth of additional data on the fuel areal density from the suite of charged particle diagnostics was obtained on a subset of the shots that used D 3 He rather than D 2 fuel. Comparisons of the experimental results with numerical simulations are shown to be in very good agreement. The design techniques employed in this campaign, e.g., smaller laser entrance holes and hohlraum case-to-capsule ratios, provide added confidence in the pursuit of ignition on the National Ignition Facility ͓J. D. Lindl, P. Amendt, R. L. Berger et al., Phys. Plasmas 11, 339 ͑2004͔͒.

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Section: Introductionmentioning

confidence: 99%

High performance capsule implosions on the OMEGA Laser facility with rugby hohlraums

et al. 2010

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“…Regarding the results from the vacuum rugby and cylinder comparison an increase in x-ray drive (+18% in x-ray flux) has been demonstrated in empty rugby-shaped hohlraum for the same incident laser energy [6]. The reduction of the wall area with the rugby geometry was equal to 30%, for a fixed laser entrance hole size and case-to-capsule ratio [6].…”

Section: Enhanced X-ray Drivementioning

confidence: 76%

“…The reduction of the wall area with the rugby geometry was equal to 30%, for a fixed laser entrance hole size and case-to-capsule ratio [6]. Typical radiation temperatures measured by Dante are displayed on Fig.…”

Section: Enhanced X-ray Drivementioning

confidence: 99%

“…These campaigns include the demonstration of ignition radiation temperatures in reduced scale hohlraums with minimized backscattering losses. It has been shown that rugby-shaped hohlraums [5] present significant advantages in terms of coupling efficiency and symmetry control with a 1/2-1/2 energy balance [6] and several tuning campaigns have been performed for capsule implosions in empty and gas-filled hohlraums. The energetics benefit of rugby over cylinder has been demonstrated [7] in both cases, leading to the highest D 2 yields to date on OMEGA in indirect-drive [8].…”

Section: Introductionmentioning

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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“…In particular, we can also have initial design of hohlraum with different geometries by this method, such as rugby-ball shaped hohlraum (Vandenboomgaerde et al, 2007). …”

Section: Discussionmentioning

confidence: 99%

An initial design of hohlraum driven by a shaped laser pulse

Lan

Ren

et al. 2010

Laser Part. Beams

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In this paper, the plasma-filling model was extrapolated to the case of a hohlraum driven by a shaped laser pulse, and this extended model was used to obtain an initial design of the hohlraum size. A density criterion of n e ¼ 0.1 was used for designing hohlraums which have low plasma filling with maximum achievable radiation. The method was successfully used to design a half hohlraum size with a three-step laser pulse on SGIII prototype and a U hohlraum size with shaped laser pulse for ignition. It was shown that the extended model with the criterion can provide reasonable initial design of a hohlraum size for optimal designing with a two-dimensional code.

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Prolate-Spheroid (“Rugby-Shaped”) Hohlraum for Inertial Confinement Fusion

Cited by 60 publications

References 20 publications

High performance capsule implosions on the OMEGA Laser facility with rugby hohlraums

High performance capsule implosions on the OMEGA Laser facility with rugby hohlraums

Progress of LMJ-relevant implosions experiments on OMEGA

An initial design of hohlraum driven by a shaped laser pulse

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