Richtmyer{endash}Meshkov instability with strong radiatively driven shocks
- Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
The Richtmyer{endash}Meshkov instability is investigated with strong radiatively driven shocks (Mach{approx_gt}20, 5{times}compression) using the Nova laser. The target consists of a solid density ablator and lower-density plastics (Atwood number {ital A}{lt}0) in planar geometry to facilitate in-flight radiographic diagnosis. Perturbations {eta}={eta}{sub 0}cos{ital kx} are imposed at the interface to seed the instability. The experiments agree with full hydrodynamic simulations over a wide variety of conditions. For small initial amplitudes {parallel}{ital A}{parallel}{ital k}{eta}{sub 0}{lt}1, the growth rate agrees with a linear impulsive model using the average of the pre- and post-shock initial amplitudes. For {parallel}{ital A}{parallel}{ital k}{eta}{sub 0}{approx_gt}1, the growth rate is limited to the difference between the transmitted shock speed and the interface speed. {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 278493
- Journal Information:
- Physics of Plasmas, Vol. 3, Issue 2; Other Information: PBD: Feb 1996
- Country of Publication:
- United States
- Language:
- English
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