Long-duration planar direct-drive hydrodynamics experiments on the NIF

被引：16

作者：

Casner, A. ^{[1
]}

Mailliet, C. ^{[1
,2
]}

Khan, S. F. ^{[3
]}

Martinez, D. ^{[3
]}

Izumi, N. ^{[3
]}

Kalantar, D. ^{[3
]}

Di Nicola, P. ^{[3
]}

Di Nicola, J. M. ^{[3
]}

Le Bel, E. ^{[2
]}

Igumenshchev, I. ^{[4
]}

Tikhonchuk, V. T. ^{[1
]}

Remington, B. A. ^{[3
]}

Masse, L. ^{[3
]}

Smalyuk, V. A. ^{[3
]}

机构：

[1] Univ Bordeaux, CNRS, CEA, CELIA,UMR 5107, F-33405 Talence, France

[2] CEA, DAM, DIF, F-91297 Arpajon, France

[3] Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA

[4] Univ Rochester, Lab Laser Energet, 250 E River Rd, Rochester, NY 14623 USA

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2018年 / 60卷 / 01期

关键词：

inertail confinement fusion; ablation; Rayleigh-Taylor instability; INERTIAL-CONFINEMENT FUSION; RAYLEIGH-TAYLOR EXPERIMENT; LASER; PERFORMANCE; INSTABILITY; IMPLOSION; EVOLUTION; DESIGN; FOILS;

D O I：

10.1088/1361-6587/aa8af4

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The advent of high-power lasers facilities such as the National Ignition Facility (NIF) and the laser megajoule provide unique platforms to study the physics of turbulent mixing flows in high energy density plasmas. We report here on the commissioning of a novel planar direct-drive platform on the NIF, which allows the acceleration of targets during 30 ns. Planar plastic samples were directly irradiated by 300-450 kJ of UV laser light (351 nm) and a very good planarity of the laser drive is demonstrated. No detrimental effect of imprint is observed in the case of these thick plastic targets (300 mu m), which is beneficial for future academic experiments requesting similar irradiation conditions. The long-duration direct-drive (DD) platform is thereafter harnessed to study the ablative Rayleigh-Taylor instability (RTI) in DD. The growth of two-dimensional pre-imposed perturbations is quantified through time-resolved face-on x-ray radiography and used as a benchmark for radiative hydrocode simulations. The ablative RTI is then quantified in its highly nonlinear stage starting from intentionally large 3D imprinted broadband modulations. Two generations of bubble mergers is observed for the first time in DD, as a result of the unprecedented long laser acceleration.

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