Ablation front Rayleigh–Taylor growth experiments in spherically convergent geometry

Glendinning, S. G.; Colvin, Jeff; Haan, S. W.; Kalantar, D. H.; Landen, O. L.; Marinak, M. M.; Remington, B. A.; Wallace, R. J.; Cherfils, C.; Dague, N.; Divol, L.; Galmiche, D.; Richard, A.

doi:10.1063/1.874024

Cited by 56 publications

(23 citation statements)

References 18 publications

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“…The increased α is also predicted to lead to lower convergence, ρR, and yields in 1D simulations. In turn, reduced convergence leads to both reduced RT and Bell-Plesset growth [19] of instabilities at the ice-ablator interface and the ice-gas interface and a reduction in their perturbative impact even for fixed final amplitude. Additionally, Dittrich et al [14] hypothesized that an increased foot level would reduce the ablation front physics sensitivity to uncertainties in the partially ionized ablated carbon.…”

mentioning

confidence: 99%

Improved Performance of High Areal Density Indirect Drive Implosions at the National Ignition Facility using a Four-Shock Adiabat Shaped Drive

Casey¹,

Milovich²,

Smalyuk³

et al. 2015

Phys. Rev. Lett.

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Hydrodynamic instabilities can cause capsule defects and other perturbations to grow and degrade implosion performance in ignition experiments at the National Ignition Facility (NIF). Here, we show the first experimental demonstration that a strong unsupported first shock in indirect drive implosions at the NIF reduces ablation front instability growth leading to a 3 to 10 times higher yield with fuel ρR > 1 g=cm 2 . This work shows the importance of ablation front instability growth during the National Ignition Campaign and may provide a path to improved performance at the high compression necessary for ignition.

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confidence: 99%

Improved Performance of High Areal Density Indirect Drive Implosions at the National Ignition Facility using a Four-Shock Adiabat Shaped Drive

Casey¹,

Milovich²,

Smalyuk³

et al. 2015

Phys. Rev. Lett.

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“…The actual measured X-ray intensity was 80. While there are some uncertainties in these numbers, it is clear that contributions from X-rays more energetic than those measured by Glendinning et al (2000) are not significantly affecting our mass measurements. The normalized height h is the size of the cloud measured along the shock tube axis divided by D 0 , and the width w is the size perpendicular to the shock tube axis divided by D 0 .…”

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confidence: 90%

“…The relative (but not absolute) strength of the nonattenuated intensities I 0; can be measured using an X-ray spectrometer, and this was done for Ti backlighters (for a type very similar to ours) in the energy range 4Y7 keV by Glendinning et al (2000). (Ti plasma may emit X-rays at energies outside this energy range, but this has little impact on our images; see below.)…”

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confidence: 99%

Experiment on the Mass Stripping of an Interstellar Cloud Following Shock Passage

Hansen

Robey

Klein

et al. 2007

ApJ

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The interaction of supernova shocks and interstellar clouds is an important astrophysical phenomenon which can lead to mass stripping (transfer of material from cloud to surrounding flow, ''mass loading'' the flow) and possibly increase the compression in the cloud to high enough densities to trigger star formation. Our experiments attempt to simulate and quantify the mass stripping as it occurs when a shock passes through interstellar clouds. We drive a strong shock (and blast wave) using 5 kJ of the 30 kJ Omega laser into a cylinder filled with low-density foam with an embedded 120 m Al sphere simulating an interstellar cloud. The density ratio between Al and foam is $9. Timeresolved X-ray radiographs show the cloud getting compressed by the shock (t % 5 ns), undergoing a classical Kelvin-Helmholtz roll-up (12 ns) followed by a Widnall instability (30 ns), an inherently three-dimensional effect that breaks the two-dimensional symmetry of the experiment. Material is continuously being stripped from the cloud at a rate which is shown to be considerably larger than what is predicted by laminar models for mass stripping; the cloud is fully stripped by 80Y100 ns, 10 times faster than the laminar model. We present a new model for turbulent mass stripping that agrees with the observed rate and that should scale to astrophysical conditions, which occur at even higher Reynolds numbers than the current experiment.

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“…1b, we examined the effect of spherical convergence on RT growth, by experimentally comparing single mode RT growth in an ablatively driven planar foil, compared to a spherically converging capsule, again using the same drive and diagnostic [5,6]. The converging case (red curve) shows greater RT growth for a given distance accelerated, s (see inset of Fig.…”

Section: Rayleigh-taylor Instability In Inertial Confinement Fusionmentioning

confidence: 99%

Experiments in ICF, materials science, and astrophysics

Remington¹

2016

Edward Teller Lectures

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Abstract. We have been developing HED experiments on high power ICF lasers over the past two decades that span (1) the radiative hydrodynamics of ICF capsule physics; (2) the high pressure, high strain rate, solid-state dynamics relevant to novel concepts for ICF and hypervelocity impacts in space and on Earth; and (3) the shock driven turbulence of exploding stars (supernovae). These different regimes are separated by many orders of magnitude in length, time, and temperature, yet there are common threads that run through all of these phenomena, such as the occurrence of hydrodynamic instabilities. Examples from each of these three seemingly very disparate regimes are given, and the common theme of hydrodynamic instability evolution is explored.

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Ablation front Rayleigh–Taylor growth experiments in spherically convergent geometry

Abstract: 3

Cited by 56 publications

References 18 publications

Improved Performance of High Areal Density Indirect Drive Implosions at the National Ignition Facility using a Four-Shock Adiabat Shaped Drive

Improved Performance of High Areal Density Indirect Drive Implosions at the National Ignition Facility using a Four-Shock Adiabat Shaped Drive

Experiment on the Mass Stripping of an Interstellar Cloud Following Shock Passage

Experiments in ICF, materials science, and astrophysics

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