Measurements of turbulent mixing due to Kelvin-Helmholtz instability in high-energy-density plasmas

V. A. Smalyuk, O. A. Hurricane, J. F. Hansen, G. Langstaff, D. Martinez, H. S. Park, K. Raman, B. A. Remington, H. F. Robey, O. Schilling, R. Wallace, Y. Elbaz, A. Shimony, D. Shvarts, C. Di Stefano, R. P. Drake, D. Marion, C. M. Krauland, C. C. Kuranz

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Kelvin-Helmholtz (KH) turbulent mixing measurements were performed in experiments on the OMEGA Laser Facility [T.R. Boehly et al., Opt. Commun. 133 (1997) 495]. In these experiments, laser-driven shock waves propagated through low-density plastic foam placed on top of a higher-density plastic foil. Behind the shock front, lower-density foam plasma flowed over the higher-density plastic plasma. The interface between the foam and plastic was KH unstable. The experiments were performed with pre-imposed, sinusoidal 2D perturbations, and broadband 3D perturbations due to surface roughness at the interface between the plastic and foam. KH instability growth was measured using X-ray, point-projection radiography. The mixing layer caused by the KH instability with layer width up to ∼100 μm was observed at a location ∼1 mm behind the shock front. The measured mixing layer width was in good agreement with simulations using a K-L turbulent mixing model in the two-dimensional ARES hydrodynamics code. In the definition of the K-L model K stands for the specific turbulent kinetic (K) energy, and L for the scale length (L) of the turbulence.

Original languageEnglish
Pages (from-to)47-51
Number of pages5
JournalHigh Energy Density Physics
Volume9
Issue number1
DOIs
StatePublished - 1 Mar 2013

Keywords

  • Hydrodynamic instabilities

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics

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