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

Casner, A.; Masse, L.; Delorme, B.; Martinez, D.; Huser, G.; Galmiche, D.; Liberatore, S.; Igumenshchev, I.; Olazabal-Loumé, M.; Nicolaï, Ph.; Breil, J.; Michel, D. T.; Froula, D.; Seka, W.; Riazuelo, G.; Fujioka, S.; Sunahara, A.; Grech, M.; Chicanne, C.; Theobald, M.; Borisenko, N.; Orekhov, A.; Tikhonchuk, V. T.; Remington, B.; Goncharov, V. N.; Smalyuk, V. A.

doi:10.1063/1.4903331

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

Journal Article · Mon Dec 01 00:00:00 EST 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4903331· OSTI ID:1414345

^[1]; Masse, L. ^[1]; Delorme, B. ^[2]; Martinez, D. ^[3]; ^[1]; Galmiche, D. ^[1]; Liberatore, S. ^[1]; ^[4]; Olazabal-Loumé, M. ^[5]; Nicolaï, Ph. ^[5]; Breil, J. ^[5]; ^[4]; Froula, D. ^[4]; Seka, W. ^[4]; Riazuelo, G. ^[1]; Fujioka, S. ^[6]; Sunahara, A. ^[6]; Grech, M. ^[7]; Chicanne, C. ^[8]; Theobald, M. ^[8] more »

Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)
Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France); Univ. of Bordeaux, Talence (France). Center for Intense Lasers and Applications (CELIA)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Univ. of Bordeaux, Talence (France). Center for Intense Lasers and Applications (CELIA)
Osaka Univ. (Japan). Inst. of Laser Engineering
Ecole Polytechnique, Palaiseau (France)
Alternative Energies and Atomic Energy Commission (CEA), Is-sur-Tille (France). Valduc Centre for Nuclear Studies
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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1414345

Alternate ID(s):: OSTI ID: 22403367

Report Number(s):: LLNL-JRNL--742951

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

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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