Observed transition from Richtmyer-Meshkov jet formation through feedout oscillations to Rayleigh-Taylor instability in a laser target

Aglitskiy, Y.; Karasik, M.; Velikovich, A. L.; Serlin, V.; Weaver, James L.; Kessler, T. J.; Nikitin, Sergei; Schmitt, A. J.; Obenschain, S. P.; Metzler, N.; Oh, Jaechul

doi:10.1063/1.4764287

Cited by 9 publications

(2 citation statements)

References 27 publications

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“…The effect of preheat can, along these lines, be viewed as belonging to a family of Richtmyer-Meshkov and Rayleigh-Taylor-like processes [13,14], in that the underlying mechanism is different, but the resulting behavior of the system is similar. As a result of the preheat, * Electronic mail: carlosds@lanl.gov the phase of the perturbation inverts, and small jets form in the troughs of any surface features of the preheated layer [15]. As shall be seen below, this results in the evolution of new surface features, as a direct consequence of the preheating of the surface.…”

Section: Introductionmentioning

confidence: 93%

Evolution of surface structure in laser-preheated perturbed materials

et al. 2017

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We report an experimental and computational study investigating the effects of laser preheat on the hydrodynamic behavior of a material layer. In particular, we find that perturbation of the surface of the layer results in a complex interaction, in which the bulk of the layer develops density, pressure, and temperature structure, and in which the surface experiences instability-like behavior, including mode coupling. A uniform one-temperature preheat model is used to reproduce the experimentallyobserved behavior, and we find that this model can be used to capture the evolution of the layer, while also providing evidence of complexities in the preheat behavior. This result has important consequences for inertially-confined fusion plasmas, which can be difficult to diagnose in detail, as well as for laser hydrodynamics experiments, which generally depend on assumptions about initial conditions in order to interpret their results.

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Section: Introductionmentioning

confidence: 93%

Evolution of surface structure in laser-preheated perturbed materials

et al. 2017

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“…With localized defects placed at the rear target surface, one can study the areal mass evolution in a perturbed expansion wave or RM jet formation, as done for the single mode cases in Refs. [27] and [48], respectively.…”

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confidence: 99%

Multimode Hydrodynamic Instability Growth of Preimposed Isolated Defects in Ablatively Driven Foils

et al. 2020

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The Nike KrF laser facility was used to study the evolution of isolated defects with characteristic sizes of < 1 to 10s of μm in laser-accelerated plastic foils. The experimental platform permitted, for the first time, the systematic study of localized perturbation growth, which is inherently multimode, through ablative Richtmyer-Meshkov and Rayleigh-Taylor stages and into the strongly nonlinear regime. Initial target defects were relatively large amplitude, but spatially localized, and emulated tent, fill-tube, and other nonuniformities that are present in inertial confinement fusion capsules. Face-on x-ray radiography indicated initial growth of the perturbation in both depth and width, followed by its apparent closure due to oblique spike growth. Hollow jetlike profiles of laterally expanding, rising, Rayleigh-Taylor bubbles were observed on the rear surface of the target from each isolated defect. Radiation hydrodynamic simulations provided insight into the mechanism of the closure and other features of the bubble and spike evolution specific to isolated defects.

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