skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Probing the deep nonlinear stage of the ablative Rayleigh-Taylor instability in indirect drive experiments on the National Ignition Facility

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4918356· OSTI ID:1837363

Academic tests in physical regimes not encountered in Inertial Confinement Fusion will help to build a better understanding of hydrodynamic instabilities and constitute the scientifically grounded validation complementary to fully integrated experiments. Under the National Ignition Facility (NIF) Discovery Science program, recent indirect drive experiments have been carried out to study the ablative Rayleigh-Taylor Instability (RTI) in transition from weakly nonlinear to highly nonlinear regime [A. Casner et al., Phys. Plasmas 19, 082708 (2012)]. In these experiments, a modulated package is accelerated by a 175 eV radiative temperature plateau created by a room temperature gas-filled platform irradiated by 60 NIF laser beams. The unique capabilities of the NIF are harnessed to accelerate this planar sample over much larger distances (≃1.4 mm) and longer time periods (≃12 ns) than previously achieved. This extended acceleration could eventually allow entering into a turbulent-like regime not precluded by the theory for the RTI at the ablation front. Simultaneous measurements of the foil trajectory and the subsequent RTI growth are performed and compared with radiative hydrodynamics simulations. We present RTI growth measurements for two-dimensional single-mode and broadband multimode modulations. Finally, the dependence of RTI growth on initial conditions and ablative stabilization is emphasized, and we demonstrate for the first time in indirect-drive a bubble-competition, bubble-merger regime for the RTI at ablation front.

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:
1837363
Report Number(s):
LLNL-JRNL-822996; 1029202; TRN: US2300426
Journal Information:
Physics of Plasmas, Vol. 22, Issue 5; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

References (61)

The effects of early time laser drive on hydrodynamic instability growth in National Ignition Facility implosions journal September 2014
Fuel gain exceeding unity in an inertially confined fusion implosion journal February 2014
Statistical approach of weakly nonlinear ablative Rayleigh–Taylor instability journal June 2005
Asymptotic spike evolution in Rayleigh–Taylor instability journal January 1999
Radiation transport and energetics of laser-driven half-hohlraums at the National Ignition Facility journal June 2014
First implosion experiments with cryogenic thermonuclear fuel on the National Ignition Facility journal March 2012
Onset of Hydrodynamic Mix in High-Velocity, Highly Compressed Inertial Confinement Fusion Implosions journal August 2013
Instabilities of ablation fronts in inertial confinement fusion: A comparison with flames journal February 2004
Improving the hot-spot pressure and demonstrating ignition hydrodynamic equivalence in cryogenic deuterium–tritium implosions on OMEGA journal May 2014
Hot-spot mix in ignition-scale implosions on the NIF journal May 2012
Low-adiabat rugby hohlraum experiments on the National Ignition Facility: Comparison with high-flux modeling and the potential for gas-wall interpenetration journal November 2014
Single-mode, Rayleigh-Taylor growth-rate measurements on the OMEGA laser system journal January 2000
Reduced instability growth with high-adiabat high-foot implosions at the National Ignition Facility journal July 2014
Self-consistent growth rate of the Rayleigh–Taylor instability in an ablatively accelerating plasma journal January 1985
Progress in indirect and direct-drive planar experiments on hydrodynamic instabilities at the ablation front journal December 2014
Point design targets, specifications, and requirements for the 2010 ignition campaign on the National Ignition Facility journal May 2011
Design and implementation plan for indirect-drive highly nonlinear ablative Rayleigh–Taylor instability experiments on the National Ignition Facility journal March 2013
An in-flight radiography platform to measure hydrodynamic instability growth in inertial confinement fusion capsules at the National Ignition Facility journal July 2014
Measuring symmetry of implosions in cryogenic Hohlraums at the NIF using gated x-ray detectors (invited) journal October 2010
The linear Darrieus-Landau and Rayleigh-Taylor instabilities in inertial confinement fusion revisited journal October 2006
Feedout coupling of Richtmyer–Meshkov and Rayleigh–Taylor instabilities in stratified, radiation-driven foils journal March 1999
Three‐dimensional simulations of Nova high growth factor capsule implosion experiments journal May 1996
Design of a High-Foot High-Adiabat ICF Capsule for the National Ignition Facility journal February 2014
Experimental measurements of the nonlinear Rayleigh-Taylor instability using a magnetorheological fluid journal February 2010
Conceptual design of a Rayleigh–Taylor experiment to study bubble merger in two dimensions on NIF journal June 2014
Growth rates of the ablative Rayleigh–Taylor instability in inertial confinement fusion journal May 1998
Large growth Rayleigh-Taylor experiments using shaped laser pulses journal December 1991
Scaling laws of the Rayleigh–Taylor ablation front mixing zone evolution in inertial confinement fusion journal May 1998
Review of theoretical modelling approaches of Rayleigh–Taylor instabilities and turbulent mixing journal April 2010
Wall and laser spot motion in cylindrical hohlraums journal March 2009
Designs for highly nonlinear ablative Rayleigh-Taylor experiments on the National Ignition Facility journal August 2012
An overview of Rayleigh-Taylor instability journal July 1984
Radiation‐dependent ionization model for laser‐created plasmas journal November 1993
Nonlinear Theory of the Ablative Rayleigh-Taylor Instability journal October 2002
Hot-Spot Mix in Ignition-Scale Inertial Confinement Fusion Targets journal July 2013
Images of the laser entrance hole from the static x-ray imager at NIF journal October 2010
Rayleigh-Taylor growth measurements of three-dimensional modulations in a nonlinear regime journal May 2006
The Darrieus–Landau instability in fast deflagration and laser ablation journal March 2008
Ablative Rayleigh–Taylor instability with strong temperature dependence of the thermal conductivity journal May 2007
Observation of the stabilizing effect of a laminated ablator on the ablative Rayleigh-Taylor instability journal May 2011
Very-high-growth-factor planar ablative Rayleigh-Taylor experiments journal May 2007
Indirect drive ablative Rayleigh–Taylor experiments with rugby hohlraums on OMEGA journal September 2009
Late-time radiography of beryllium ignition-target ablators in long-pulse gas-filled hohlraums journal May 2006
The high-foot implosion campaign on the National Ignition Facility journal May 2014
Areal density evolution of isolated surface perturbations at the onset of x-ray ablation Richtmyer-Meshkov growth journal September 2011
Review of nonlinear dynamics of the unstable fluid interface: conservation laws and group theory journal October 2008
A nonlocal electron conduction model for multidimensional radiation hydrodynamics codes journal January 2000
The Physics of Inertial Fusion book January 2004
Asymptotic Behavior of the Rayleigh-Taylor Instability journal June 2005
Early stage of implosion in inertial confinement fusion: Shock timing and perturbation evolution journal January 2006
Dimensionality dependence of the Rayleigh–Taylor and Richtmyer–Meshkov instability late-time scaling laws journal June 2001
Comparison of X-ray source concepts for radiographic purposes at OMEGA journal September 2013
Fourier-Space Nonlinear Rayleigh-Taylor Growth Measurements of 3D Laser-Imprinted Modulations in Planar Targets journal November 2005
Backscatter measurements for NIF ignition targets (invited) journal October 2010
Dante soft x-ray power diagnostic for National Ignition Facility journal October 2004
Bubble Acceleration in the Ablative Rayleigh-Taylor Instability journal November 2006
Gravitationally Unstable Flames: Rayleigh-Taylor Stretching Versus Turbulent Wrinkling journal June 2013
Observation of Self-Similar Behavior of the 3D, Nonlinear Rayleigh-Taylor Instability journal December 2005
Onset of nonlinear saturation for Rayleigh-Taylor growth in the presence of a full spectrum of modes journal June 1989
Rayleigh-Taylor Instability Experiments with Precise and Arbitrary Control of the Initial Interface Shape journal November 2007
National Ignition Facility laser performance status journal January 2007

Cited By (7)

Status of NIF laser and high power laser research at LLNL conference February 2017
Development and validation of the TROLL radiation-hydrodynamics code for 3D hohlraum calculations journal December 2018
Long-duration direct drive hydrodynamics experiments on the National Ignition Facility: Platform development and numerical modeling with CHIC journal August 2019
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
From ICF to laboratory astrophysics: ablative and classical Rayleigh–Taylor instability experiments in turbulent-like regimes journal December 2018
Advanced high resolution x-ray diagnostic for HEDP experiments journal November 2018