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Title: Progress in indirect and direct-drive planar experiments on hydrodynamic instabilities at the ablation front

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4903331· OSTI ID:1414345
ORCiD logo [1];  [1];  [2];  [3]; ORCiD logo [1];  [1];  [1]; ORCiD logo [4];  [5];  [5];  [5]; ORCiD logo [4];  [4];  [4];  [1];  [6];  [6];  [7];  [8];  [8] more »;  [9];  [9];  [5];  [3];  [4];  [3] « less
  1. Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
  2. Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France); Univ. of Bordeaux, Talence (France). Center for Intense Lasers and Applications (CELIA)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  5. Univ. of Bordeaux, Talence (France). Center for Intense Lasers and Applications (CELIA)
  6. Osaka Univ. (Japan). Inst. of Laser Engineering
  7. Ecole Polytechnique, Palaiseau (France)
  8. Alternative Energies and Atomic Energy Commission (CEA), Is-sur-Tille (France). Valduc Centre for Nuclear Studies
  9. Russian Academy of Sciences (RAS), Moscow (Russian Federation). P. N. Lebedev Physical Inst.

Understanding and mitigating hydrodynamic instabilities and the fuel mix are the key elements for achieving ignition in Inertial Confinement Fusion. Cryogenic indirect-drive implosions on the National Ignition Facility have evidenced that the ablative Rayleigh-Taylor Instability (RTI) is a driver of the hot spot mix. This motivates the switch to a more flexible higher adiabat implosion design [O. A. Hurricane et al., Phys. Plasmas 21, 056313 (2014)]. The shell instability is also the main candidate for performance degradation in low-adiabat direct drive cryogenic implosions [Goncharov et al., Phys. Plasmas 21, 056315 (2014)]. This paper reviews recent results acquired in planar experiments performed on the OMEGA laser facility and devoted to the modeling and mitigation of hydrodynamic instabilities at the ablation front. In application to the indirect-drive scheme, we describe results obtained with a specific ablator composition such as the laminated ablator or a graded-dopant emulator. In application to the direct drive scheme, we discuss experiments devoted to the study of laser imprinted perturbations with special phase plates. The simulations of the Richtmyer-Meshkov phase reversal during the shock transit phase are challenging, and of crucial interest because this phase sets the seed of the RTI growth. Recent works were dedicated to increasing the accuracy of measurements of the phase inversion. We conclude by presenting a novel imprint mitigation mechanism based on the use of underdense foams. Lastly, the foams induce laser smoothing by parametric instabilities thus reducing the laser imprint on the CH foil.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1414345
Report Number(s):
LLNL-JRNL-742951; TRN: US1800681
Journal Information:
Physics of Plasmas, Vol. 21, Issue 12; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (6)

Direct Laser Writing of Low-Density Interdigitated Foams for Plasma Drive Shaping journal September 2017
Stabilization of high-compression, indirect-drive inertial confinement fusion implosions using a 4-shock adiabat-shaped drive journal August 2015
Development of new platforms for hydrodynamic instability and asymmetry measurements in deceleration phase of indirectly driven implosions on NIF journal August 2018
Long-duration direct drive hydrodynamics experiments on the National Ignition Facility: Platform development and numerical modeling with CHIC journal August 2019
Review of hydrodynamic instability experiments in inertially confined fusion implosions on National Ignition Facility journal October 2019
From ICF to laboratory astrophysics: ablative and classical Rayleigh–Taylor instability experiments in turbulent-like regimes journal December 2018

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