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Title: From ICF to laboratory astrophysics: ablative and classical Rayleigh-Taylor Instability experiments in turbulent-like regimes

Journal Article · · Nuclear Fusion
 [1];  [2];  [3];  [4];  [4];  [3];  [3];  [5];  [5];  [6];  [6];  [7];  [4];  [4];  [4];  [4];  [4];  [8];  [1];  [9] more »;  [10];  [7];  [4];  [4];  [3] « less
  1. Univ. de Bordeaux-CNRS-CEA, Talence (France)
  2. Univ. de Bordeaux-CNRS-CEA, Talence (France); Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
  3. Ecole Polytechnique, Palaiseau (France)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Osaka Univ., Suita (Japan)
  6. Univ. of Chicago, IL (United States)
  7. Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
  8. Univ. of Rochester, NY (United States)
  9. Lawrence Livermore National Laboratory
  10. Inst. of research into the fundamental laws of the Universe (IRFU) - CEA -DRF (France)

Rayleigh–Taylor instability (RTI) occurs whenever fluids of different densities are accelerated against the density gradient, as is the case for the target ablator in ICF implosions. The advent of megajoule class lasers, like the National Ignition Facility (NIF) or Laser Mégajoule, offers novel opportunities to study turbulent mixing flows in high energy density plasmas for fundamental hydrodynamics or laboratory astrophysics experiments. Here, we review different RTI experiments, performed either at the ablation front or at a classical embedded interface. A two-dimensional bubble-merger, bubble-competition regime was evidenced for the first time at the ablation front in indirect-drive on the NIF thanks to an unprecedented long x-ray drive. Similarly, a novel large-area, planar platform enables the capabilities to perform long duration direct drive hydrodynamics experiments on NIF. Starting from imprinted seeds, a three-dimensional bubble-merger regime was also observed in direct-drive, as larger bubbles overtook and merged with smaller bubbles. In the astrophysical context, RTI also plays a role in supernova (SN) explosions, either of Type Ia or II. We report on experiments performed on the LULI2000 facility studying RTI in scaled laboratory conditions relevant for the physics of young SN remnants. Finally, using a light CH foam as a deceleration medium, we measured, for the first time, the RTI mixing zone by PW transverse radiography.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1529186
Report Number(s):
LLNL-JRNL-778781; 971689
Journal Information:
Nuclear Fusion, Vol. 59, Issue 3; ISSN 0029-5515
Publisher:
IOP ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (3)

Two mode coupling of the ablative Rayleigh-Taylor instabilities journal March 2019
Turbulent mixing and transition criteria of flows induced by hydrodynamic instabilities journal August 2019
Long-duration direct drive hydrodynamics experiments on the National Ignition Facility: Platform development and numerical modeling with CHIC journal August 2019