High Density Transition Laser Driven Implosions

Bayer, C.; Bernard, M.; Decroisette, M.; Juraszek, D.; Meynial, D.

doi:10.1007/978-1-4615-7332-6_49

Cited by 2 publications

(4 citation statements)

References 18 publications

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“…The experiments were performed with a pulse duration of 500 ps. Other results obtained at 50 and 200 ps and published elsewhere [7,35,45] will be referred to during the discussion. The characteristics of the more representative imploded targets, together with the nominal value of the laser irradiance on target 0i, are reported in Tables II and III.…”

Section: Fig5 Pinhole Camera Photograph Of Time-integrated X-ray Emis...mentioning

confidence: 98%

Laser implosion of microballoons: study of the transition from exploding-pusher to ablative regime

et al. 1984

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Microballoons filled with an equimolar deuterium-tritium mixture and coated with a plastic ablator of variable thickness are imploded by the eight-beam Octal laser (X = 1.06 jum; 0.6 TW). An X-ray r diagnostic with space-time resolution is used to analyse the implosion of the targets designed to the highest /pdr. The experimental results are compared with numerical simulations performed by a one-dimensional J Lagrangian code. A DT density of about 2 gem" 3 is obtained; the transition from an exploding-pusher regime to a more ablative one is analysed on the basis of the evolution of the preheat, the hydrodynamic efficiency and the density and temperature performance.

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Section: Fig5 Pinhole Camera Photograph Of Time-integrated X-ray Emis...mentioning

confidence: 98%

Laser implosion of microballoons: study of the transition from exploding-pusher to ablative regime

et al. 1984

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“…A maximum amplification of 10 4 is obtained for the mode 160 and is significantly lower than the one obtained with a CH ablator (>10 5 ) [30]. Its effects on target perturbations have then been computed using Haan's model of saturation [31], and assuming for the target the same surface spectrum known as NOVA roughness mode spectrum [32] given by A l0 (µm) = 0.19 (l/4) 4 + (l/60) 0.4 + 0.12 × 10 −3 (l/60) 0.8 + (l/1200) 8 .…”

Section: Ablation Front Rtimentioning

confidence: 99%

“…In this paper, we present a direct-drive target-design for the LMJ, which has been developed recently. A direct-drive target for LMJ was presented a few years ago [8,9]. It consisted of a cryogenic DT layer and a CH plastic ablator.…”

Section: Introductionmentioning

confidence: 99%

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High-gain direct-drive target design for the Laser Mégajoule

et al. 2004

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In the context of the French Laser-Mégajoule fusion-research programme, a direct-drive target design is developed. It is based on the use of a CH-foam ablator filled with cryogenic deuterium-tritium. One-dimensional optimization leads to a potential gain of 60 with a 1.5 MJ laser. The hydrodynamic stability of the implosion is investigated at the ablation front and the hot-spot surface by means of modelling and two-dimensional simulations. The effect of irradiation non-uniformities on low-mode (time-dependent) implosion asymmetries is studied by two-dimensional hydrodynamics simulations with three-dimensional laser-light raytracing. The effect of beam focal shapes on hot spot low-mode asymmetries is also addressed.

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High Density Transition Laser Driven Implosions

Cited by 2 publications

References 18 publications

Laser implosion of microballoons: study of the transition from exploding-pusher to ablative regime

Laser implosion of microballoons: study of the transition from exploding-pusher to ablative regime

High-gain direct-drive target design for the Laser Mégajoule

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