Evidence for a Bubble-Competition Regime in Indirectly Driven Ablative Rayleigh-Taylor Instability Experiments on the NIF
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
In this paper, we investigate on the National Ignition Facility the ablative Rayleigh-Taylor instability in the transition from weakly nonlinear to highly nonlinear regimes. A planar plastic package with preimposed two-dimensional broadband modulations is accelerated for up to 12 ns by the x-ray drive of a gas-filled Au radiation cavity with a radiative temperature plateau at 175 eV. This extended tailored drive allows a distance traveled in excess of 1 mm for a 130 μm thick foil. Measurements of the modulation optical density performed by x-ray radiography show that a bubble-merger regime for the Rayleigh-Taylor instability at an ablation front is achieved for the first time in indirect drive. Finally, the mutimode modulation amplitudes are in the nonlinear regime, grow beyond the Haan multimode saturation level, evolve toward the longer wavelengths, and show insensitivity to the initial conditions.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1376014
- Alternate ID(s):
- OSTI ID: 1193895
- Report Number(s):
- LLNL-JRNL-670326
- Journal Information:
- Physical Review Letters, Vol. 114, Issue 21; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Ablative stabilization of Rayleigh-Taylor instabilities resulting from a laser-driven radiative shock
|
journal | May 2018 |
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 |
From ICF to laboratory astrophysics: ablative and classical Rayleigh–Taylor instability experiments in turbulent-like regimes
|
journal | December 2018 |
Status of NIF laser and high power laser research at LLNL
|
conference | February 2017 |
Similar Records
Probing the deep nonlinear stage of the ablative Rayleigh-Taylor instability in indirect drive experiments on the National Ignition Facility
Rayleigh-Taylor growth measurements of three-dimensional modulations in a nonlinear regime