J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 175-177
Hydrodynamic instabilities at ablation front: Numerical investigation on stabilization by adiabat shapingM. Olazabal-Loumé and L. Hallo
CELIA UMR 5107, Université Bordeaux I, 351 cours de la Libération, 33405 Talence Cedex, France
This study deals with the hydrodynamic stability of a planar target in the context of direct drive ICF. Recently, different schemes have been proposed in order to reduce ablative Rayleigh-Taylor growth. They are based on the target adiabat shaping in the ablation zone. In this work, we consider an adiabat shaping scheme by relaxation: a prepulse is followed by a relaxation period where the laser is turned off. A numerical study is performed with a perturbation code dedicated to the linear stability analysis. The simulations show stabilizing effects of the relaxation scheme on the linear Rayleigh-Taylor growth rate. Influence of the picket parameters is also discussed.
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