Convergent Rayleigh-Taylor Experiments on the Nova Laser

Cherfils, C.; Glendinning, S. G.; Galmiche, D.; Remington, B. A.; Richard, A.; Haan, S. W.; Wallace, R. J.; Dague, N.; Kalantar, D. H.

doi:10.1103/physrevlett.83.5507

Cited by 42 publications

(17 citation statements)

References 22 publications

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“…The overreaching conclusion of the present paper is that each and every phenomenon that occurs in spherical geometry occurs also in cylindrical geometry. From the experimental point of view, cylindrical geometry offers ease of diagnostics, although recent experiments have observed some convergence effects in imploding spheres 21 . Our results establish a one-toone correspondence between the two geometries, and for that purpose we will use the same notation and terminology as in Ref.…”

Section: Introduction and Comparisonmentioning

confidence: 99%

Rayleigh-Taylor and Richtmyer-Meshkov instabilities and mixing in stratified cylindrical shells

2005

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We study the linear stability of an arbitrary number N of cylindrical concentric shells undergoing a radial implosion or explosion.We derive the evolution equation for the perturbation i η at interface i; it is coupled to the two adjacent interfaces via η i ±1 . For N=2, where there is only one interface, we verify Bell's conjecture as to the form of the evolution equation for arbitrary ρ 1 and ρ 2 , the fluid densities on either side of the interface. We obtain several analytic solutions for the N=2 and 3 cases.We discuss freeze-out, a phenomenon that can occur in all three geometries (planar, cylindrical, or spherical), and "critical modes" that are stable for any implosion or explosion history and occur only in cylindrical or spherical geometries. We present numerical simulations of possible gelatin-ring experiments illustrating perturbation feedthrough from one interface to another. We also develop a simple model for the evolution of turbulent mix in cylindrical geometry and define a geometrical factor G as the ratio h cylindrical / h planar between cylindrical and planar mixing layers. We find that G is a decreasing function of o R R / , implying that in our model h cylindrical evolves faster (slower) than h planar during an implosion (explosion).

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Section: Introduction and Comparisonmentioning

confidence: 99%

Rayleigh-Taylor and Richtmyer-Meshkov instabilities and mixing in stratified cylindrical shells

2005

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“…It is ϳ700 m long with an outer radius of 100 m. For the work described here, the core consisted of an outer layer of copper, nominally 5 m thick, and 95 m of solid density plastic; a full description of all the experimental variations will be published elsewhere. 34 The implosion is driven by 18 nate the central 500 m section of the target, over the marker layer, to launch a one-dimensional shock into the region of interest. The experiment is shown schematically in Fig.…”

Section: Methodsmentioning

confidence: 99%

Observation and simulation of plasma mix after reshock in a convergent geometry

et al. 2004

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Experiments to study the effect of a second, counterpropagating shock on the growth of hydrodynamic instabilities in a convergent, compressible system have been performed on the Omega Laser [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] at the University of Rochester. Direct laser illumination of a cylindrical target launches a strong shock across hydrodynamically unstable interfaces formed between an epoxy ablator material on the outside, a buried aluminum marker layer and low-density CH foam on the inside. The Richtmyer–Meshkov instability mixes the marker into the two adjacent materials. Of particular interest is what happens when the mixing region is reshocked by using a second, coaxial central cylinder to reflect the incident shock back into the mixing region. These experiments have been extensively modeled, in two dimensions, using the hydrocodes NYM [P. D. Roberts et al., J. Phys. D 13, 1957 (1980)], PETRA [D. L. Youngs, Physica D 12, 32 (1984)], and RAGE [R. M. Baltrusaitis et al., Phys. Fluids 8, 2471 (1996)]. Good agreement is shown between the simulations and experimental data.

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“…The Rayleigh-Taylor (RT) instability 1-3 and RichtmyerMeshkov (RM) instability 4,5 occur in a number of plasma configurations, including inertial confinement fusion, 6 high energy density shock tube experiments, 7 and in astrophysical systems such as supernova explosions. 8 The RM instability occurs when two fluids at different densities are impulsively accelerated such as resulting from the passage of a shock wave through the fluids.…”

Section: Introductionmentioning

confidence: 99%

Single line-of-sight dual energy backlighter for mix width experiments

Baker

Glendinning

Guymer

et al. 2014

Review of Scientific Instruments

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We present a diagnostic technique used to spatially multiplex two x-ray radiographs of an object onto a detector along a single line-of-sight. This technique uses a thin, <2 μm, cosputtered backlighter target to simultaneously produce both Ni and Zn Heα emission. A Ni picket fence filter, 500 μm wide bars and troughs, is then placed in front of the detector to pass only the Ni Heα emission in the bar region and both energies in the trough region thereby spatially multiplexing the two radiographs on a single image. Initial experimental results testing the backlighter spectrum are presented along with simulated images showing the calculated radiographic images though the nickel picket fence filter which are used to measure the mix width in an accelerated nickel foam.

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Convergent Rayleigh-Taylor Experiments on the Nova Laser

Cited by 42 publications

References 22 publications

Rayleigh-Taylor and Richtmyer-Meshkov instabilities and mixing in stratified cylindrical shells

Rayleigh-Taylor and Richtmyer-Meshkov instabilities and mixing in stratified cylindrical shells

Observation and simulation of plasma mix after reshock in a convergent geometry

Single line-of-sight dual energy backlighter for mix width experiments

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