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DOE OSTI · 2531026

Rippled shock propagation in a laser-driven target at multimegabar pressures

Acharya, N. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0000000245336160)·Pantell, H. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0009000336351371)·Polsin, D. N. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0000000195295056)·Rygg, J. R. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0000000206057847)·Collins, G. W. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0000000248831087)·Celliers, P. M. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000176001227)·Betti, R. [University of Rochester, NY (United States). Laboratory for Laser Energetics]·Gleason, A. E. [Stanford University, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0000000277365118)·Aluie, H. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0000000335163697)·Shang, J. K. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0000000314667108)
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Abstract

The evolution of non-uniform shocks produced by modulated laser irradiation or surface perturbations is relevant to studies of inertial confinement fusion and material properties at high-energy-density conditions. We present results from an experiment conducted at the OMEGA EP laser facility, where a 300 GPa shock was driven into a fused silica sample with pre-fabricated single-mode surface modulations. Using time-resolved optical velocimetry, we captured the continuous evolution of rippled shock motion, enabling a comprehensive mapping of the spatial amplitude history from formation to phase reversal in a single experiment. Initially, the ablation-driven shock inherits a fraction of the surface modulation amplitude from the sample, which subsequently grows before decaying, ultimately leading to the flattening of the rippled shock and a phase reversal. We find that two-dimensional inviscid hydrodynamic simulation of the experiment is able to qualitatively capture many aspects of the rippled shock evolution but over-predicts the initial amplitude growth. This experimental platform, capable of accommodating varying ripple wavelengths, lays the groundwork for a potential viscometry method at extreme pressures, where viscous effects manifest as differences in shock flattening times between rippled shocks of two distinct wavelengths propagating through the sample.

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36 MATERIALS SCIENCE70 PLASMA PHYSICS AND FUSION TECHNOLOGYHydrodynamics simulationsInterferometryLasersShock wavesStreak camerasVelocimetryViscosityhigh pressurehydrodynamicsinterferometrylasersshock wavesstreak camerasvelocimetryviscosity

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Acharya, N. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0000000245336160), Pantell, H. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0009000336351371), Polsin, D. N. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0000000195295056), Rygg, J. R. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0000000206057847), Collins, G. W. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0000000248831087), Celliers, P. M. [Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)] (ORCID:0000000176001227), Betti, R. [University of Rochester, NY (United States). Laboratory for Laser Energetics], Gleason, A. E. [Stanford University, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0000000277365118), Aluie, H. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0000000335163697), Shang, J. K. [University of Rochester, NY (United States). Laboratory for Laser Energetics] (ORCID:0000000314667108). 2025-03-17. Rippled shock propagation in a laser-driven target at multimegabar pressures. https://doi.org/10.1063/5.0254483

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36 MATERIALS SCIENCE↗