Demonstration of Scale-Invariant Rayleigh-Taylor Instability Growth in Laser-Driven Cylindrical Implosion Experiments.
作者信息
Sauppe J P, Palaniyappan S, Tobias B J, Kline J L, Flippo K A, Landen O L, Shvarts D, Batha S H, Bradley P A, Loomis E N, Vazirani N N, Kawaguchi C F, Kot L, Schmidt D W, Day T H, Zylstra A B, Malka E
机构信息
Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, New Mexico 87545, USA.
Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
出版信息
Phys Rev Lett. 2020 May 8;124(18):185003. doi: 10.1103/PhysRevLett.124.185003.
Rayleigh-Taylor instability growth is shown to be hydrodynamically scale invariant in convergent cylindrical implosions for targets that varied in radial dimension and implosion timescale by a factor of 3. The targets were driven directly by laser irradiation providing a short impulse, and instability growth at an embedded aluminum interface occurs as it converges radially inward by a factor of 2.25 and decelerates on a central foam core. Late-time growth factors of 14 are observed for a single-mode m=20 azimuthal perturbation at both scales, despite the differences in laser drive conditions between the experimental facilities, consistent with predictions from radiation-hydrodynamics simulations. This platform enables detailed investigations into the limits of hydrodynamic scaling in high-energy-density systems.
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