Perturbation transfer from the front to rear surface of laser-irradiated targets

Shigemori, K.; Azechi, H.; Nakai, M.; Endo, Tamio; Nagaya, T.; Yamanaka, Tatsuhiko

doi:10.1103/physreve.65.045401

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…An upwind space-time conservation elements/solution elements (CE/SE) scheme is used with second-order accuracy in both space and time (Shen et al 2015a;Shen, Wen & Zhang 2015b;Shen & Wen 2016). A volume-fraction-based five-equation model (Abgrall 1996;Shyue 1998) is used to illustrate the different species residing on both sides of the inhomogeneous interface. The contact discontinuity restoring Harten-Lax-van Leer contact Riemann solver (Toro, Spruce & Speares 1994) is used to determine the numerical fluxes between the conservation elements.…”

Section: Numerical Schemementioning

confidence: 99%

“…In the ICF, the disturbance at the hotspot–fuel interface originates from its initial perturbation, the feedthrough of the perturbation on the ablation surface and the driven inhomogeneity (Hsing & Hoffman 1997; Weir, Chandler & Goodwin 1998; Shigemori et al. 2002; Regan et al. 2004; Haan et al.…”

Section: Introductionmentioning

confidence: 99%

“…In the ICF, the disturbance at the hotspot-fuel interface originates from its initial perturbation, the feedthrough of the perturbation on the ablation surface and the driven inhomogeneity (Hsing & Hoffman 1997;Weir, Chandler & Goodwin 1998;Shigemori et al 2002;Regan et al 2004;Haan et al 2011;Simakov et al 2014;Knapp et al 2017;Desjardins et al 2019). Milovich et al (2004) showed that the feedthrough of the ablation surface leads to a significant decrease in the implosion efficiency of a double-shell ignition target.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic instabilities of two successive slow/fast interfaces induced by a weak shock

Luo

2023

J. Fluid Mech.

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Shock-induced instability developments of two successive interfaces have attracted much attention, but remain a difficult problem to solve. The feedthrough and reverberating waves between two successive interfaces significantly influence the hydrodynamic instabilities of the two interfaces. The evolutions of two successive slow/fast interfaces driven by a weak shock wave are examined experimentally and numerically. First, a general one-dimensional theory is established to describe the movements of the two interfaces by studying the rarefaction waves reflected between the two interfaces. Second, an analytical, linear model is established by considering the arbitrary wavenumber and phase combinations and compressibility to quantify the feedthrough effect on the Richtmyer–Meshkov instability (RMI) of two successive slow/fast interfaces. The feedthrough significantly influences the RMI of the two interfaces, and even leads to abnormal RMI (i.e. phase reversal of a shocked slow/fast interface is inhibited) which is the first observational evidence of the abnormal RMI provided by the present study. Moreover, the stretching effect and short-time Rayleigh–Taylor instability or Rayleigh–Taylor stabilisation imposed by the rarefaction waves on the two interfaces are quantified considering the two interfaces’ phase reversal. The conditions and outcomes of the freeze-out and abnormal RMI caused by the feedthrough are summarised based on the theoretical model and numerical simulation. A specific requirement for the simultaneously freeze-out of the instability of the two interfaces is proposed, which can potentially be used in the applications to suppress the hydrodynamic instabilities.

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Section: Numerical Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic instabilities of two successive slow/fast interfaces induced by a weak shock

Luo

2023

J. Fluid Mech.

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“…However, ablative RTI is inevitable as a result of nonuniformities such as initial target surface roughness. These perturbations will then feed through in deeper layers of the D-T capsule, 12,13 seeding converging classical RTI at the pusher-fuel interface. 14,15 This will eventually degrade the symmetry of implosion and cause pollution of the central hot spot.…”

Section: Introductionmentioning

confidence: 99%

Reduced ablative Rayleigh–Taylor growth measurements in indirectly driven laminated foils

et al. 2011

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Indirectly driven, ablative Rayleigh-Taylor instability growth measurements in Ge-doped plastic foils were studied using face-on and side-on x-ray radiography. Laminated samples consisting of alternating layers of Ge-doped and undoped plastic and homogeneous Ge-doped foils were considered. We show for the first time that hydrodynamics do not depend upon structuration of the samples and that stabilization occurs in the case of laminated samples. All data were found to be in good agreement with bi-dimensional hydrosimulations based on theoretical and numerical predictions published earlier ͓L. Masse, Phys. Rev. Lett. 98, 245001 ͑2007͔͒, encouraging new designs using laminated structures for ignition capsules.

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2022

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Perturbation transfer from the front to rear surface of laser-irradiated targets

Cited by 6 publications

References 17 publications

Hydrodynamic instabilities of two successive slow/fast interfaces induced by a weak shock

Hydrodynamic instabilities of two successive slow/fast interfaces induced by a weak shock

Reduced ablative Rayleigh–Taylor growth measurements in indirectly driven laminated foils

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