Ablative Richtmyer-Meshkov Instability: Theory and Experimental Results

Conference · Wed Jun 28 04:00:00 EDT 2006 · Journal de Physique France

OSTI ID:885161

Goncharov, V N ^[1]; Gotchev, O V; McCrory, R L; McKenty, P W; Meyerhofer, D D; Sangster, T C; Skupsky, S; Cherfils-Clerouin, C

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1. Laboratory for Laser Energetics, University of Rochester, Rochester, NY

Rayleigh–Taylor instability, the main source of symmetry degradation in ICF experiments, is seeded at the early stage of an implosion, during the shock transit through the shell. The ablation-front nonuniformities at such a time can be amplified by an instability, which is similar to the Richtmyer–Meshkov instability. In the presence of ablation, however, the dynamic overpressure (rocket effect) significantly reduces the perturbation growth. The modes localized inside the conduction zone between the laser-absorption region and the ablation front are totally stabilized. An analytical model is presented to describe the perturbation evolution at the ablation front during the shock propagation time. The model is compared against the results of both the multidimensional simulations and a series of experiments performed on the OMEGA Laser System.

• Research Organization: Laboratory for Laser Energetics, University of Rochester
• Sponsoring Organization: USDOE
• DOE Contract Number: FC52-92SF19460
• OSTI ID: 885161
• Report Number(s): DOE/SF/19460-680; 1641; 2005-28
• Conference Information: Journal Name: Journal de Physique France Journal Volume: 133
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ABLATION
DISTURBANCES
ICF DEVICES
MATHEMATICAL MODELS
RAYLEIGH-TAYLOR INSTABILITY
SYMMETRY