Late-time hohlraum pressure dynamics in supernova remnant experiments

Hurricane, O. A.; Glendinning, S. G.; Remington, B. A.; Drake, R. P.; Dannenberg, K. K.

doi:10.1063/1.1373416

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…Accelerating samples over such long time duration with a hohlraum generated x-ray drive (even multibarrel hohlraums [36,37]) without stagnation effects seems difficult. It has been known for years that significant late-time hohlraum internal pressures affect the hydrodynamics of HED experiments [38]. DD planar experiments are therefore a more attractive avenue for creating a long-duration (hundreds of ns) acceleration drive.…”

Section: Introductionmentioning

confidence: 99%

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

Casner

Mailliet

Khan

et al. 2017

Plasma Phys. Control. Fusion

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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 μm), 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 twodimensional 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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Section: Introductionmentioning

confidence: 99%

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

Casner

Mailliet

Khan

et al. 2017

Plasma Phys. Control. Fusion

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“…Knowledge of this late-time pressure drive, and its accurate modeling, are important in the interpretation of experiments driven by hohlraum targets. 21,22 The target assembly consists of a 200-or 400-m-diam aluminum disk, set ͑flush with both faces͒ within a 1000-m-diam gold washer ͓Fig. 1͑b͔͒.…”

Section: Planar-shock Experimentsmentioning

confidence: 99%

Supersonic jet and shock interactions

et al. 2002

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Supersonic fluid flow and the interaction of strong shock waves to produce jets of material are ubiquitous features of inertial confinement fusion ͑ICF͒, astrophysics, and other fields of high energy-density science. The availability of large laser systems provides an opportunity to investigate such hydrodynamic systems in the laboratory, and to test their modeling by radiation hydrocodes. We describe experiments to investigate the propagation of a structured shock front within a radiation-driven target assembly, the formation of a supersonic jet of material, and the subsequent interaction of this jet with an ambient medium in which a second, ablatively driven shock wave is propagating. The density distribution within the jet, the Kelvin-Helmholz roll-up at the tip of the jet, and the jet's interaction with the counterpropagating shock are investigated by x-ray backlighting. The experiments were designed and modeled using radiation hydrocodes developed by Los Alamos National Laboratory, AWE, and Lawrence Livermore National Laboratory. The same hydrocodes are being used to model a large number of other ICF and high energy-density physics experiments. Excellent agreement between the different simulations and the experimental data is obtained, but only when the full geometry of the experiment, including both laser-heated hohlraum targets ͑driving the jet and counter-propagating shock͒, is included. The experiments were carried out at the University of Rochester's Omega laser ͓J. M. Soures et al., Phys. Plasmas 3, 2108 ͑1996͔͒.

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“…Whereas this drive would allow to observe for the first time bubble-merging and bubble-competition in indirect-drive, it is unlikely that hundred of ns X-ray drive could be achieved that way. Hohlraum wall plasma expansion and stagnation on axis [18] constitute the final limiting parameters either from a diagnostic point of view or for the simulation of the experiments. Notwithstanding the fact that direct-drive illumination with beams concatenation in time is the most promising road to create a very long acceleration drive, we present an alternative approach to create a longer X-ray drive.…”

Section: Introductionmentioning

confidence: 99%

Long duration X-ray drive hydrodynamics experiments relevant for laboratory astrophysics

Casner

Martinez

Smalyuk

et al. 2015

High Energy Density Physics

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a b s t r a c tThe advent of high-power lasers facilities such as the National Ignition Facility (NIF), and the Laser Megajoule (LMJ) in the near future, opens a new era in the field of High Energy Density Laboratory Astrophysics. These versatile laser facilities will provide unique platforms to study the rich physics of nonlinear and turbulent mixing flows. The extended laser pulse duration could be harnessed to accelerate targets over much larger distances and longer time periods than previously achieved. We report on the first results acquired on NIF with the ablative RayleigheTaylor Instability (RTI) platform. A 20-ns Xray drive is tailored to accelerate planar modulated samples into the highly-nonlinear bubble merger regime. Based on the analogy between flames front and ablation front, highly nonlinear RTI measurements at ablation front can provide important insights into the initial deflagration stage of thermonuclear supernova of Type Ia. We also report on an innovative concept used to create even longer drive on multi-beam laser facilities. The multi-barrel hohlraum (Gattling Gun) approach consists, here, of three adjacent cavities, driven in succession in time. This novel concept has been validated on the Omega EP laser system. The three cavities were irradiated with three 6e10 ns pulse UV beams and a 30 ns, 90 eV Xray radiation drive was measured with the time-resolved X-ray spectrometer mDMX. This concept is promising to investigate the pillar structures in the Eagle Nebula or for photoionization studies which require a steady light source of sufficient duration to recreate relevant physics.

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Late-time hohlraum pressure dynamics in supernova remnant experiments

Cited by 8 publications

References 9 publications

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

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

Supersonic jet and shock interactions

Long duration X-ray drive hydrodynamics experiments relevant for laboratory astrophysics

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