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

Masse, L.; Huser, G.; Galmiche, D.; Liberatore, S.; Riazuelo, G.; Delorme, B.; Martinez, D.; Remington, B.; Smalyuk, V. A.; Igumenshchev, I.; Michel, D. T.; Froula, D.; Seka, W.; Goncharov, V. N.; Olazabal-Loumé, M.; Nicolaï, Ph.; Breil, J.; Tikhonchuk, V. T.; Fujioka, S.; others, and

doi:10.1063/1.4903331

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

Journal Article · Mon Dec 15 04:00:00 EST 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4903331· OSTI ID:22403367

Masse, L.; Huser, G.; Galmiche, D.; Liberatore, S.; Riazuelo, G. ^[1]; Delorme, B. ^[1]; Martinez, D.; Remington, B.; Smalyuk, V. A. ^[2]; Igumenshchev, I.; Michel, D. T.; Froula, D.; Seka, W.; Goncharov, V. N. ^[3]; Olazabal-Loumé, M.; Nicolaï, Ph.; Breil, J.; Tikhonchuk, V. T. ^[4]; Fujioka, S. ^[5]; others, and

CEA, DAM, DIF, F-91297 Arpajon (France)
Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Laboratory of Laser Energetics, Rochester, New York 14623-1299 (United States)
CELIA, University of Bordeaux-CNRS-CEA, F-33400 Talence (France)
Institute of Laser Engineering, Osaka University, Suita, Osaka 565 (Japan)

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. The foams induce laser smoothing by parametric instabilities thus reducing the laser imprint on the CH foil.

OSTI ID:: 22403367

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 12 Vol. 21; ISSN PHPAEN; ISSN 1070-664X

Country of Publication:: United States

Language:: English

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