Shock generation comparison with planar and hemispherical targets in shock ignition relevant experiment
Résumé
We performed an experiment on the " Ligne d'Intégration Laser " facility to produce strong shocks with plasma conditions relevant for the Shock Ignition approach to Inertial Confinement Fusion. Two kinds of target have been used: planar and hemispherical. We observe an increase of the shock velocity in hemispherical geometry, which entails a fairly planar shock despite the Gaussian focal spot. Numerical results reproduce in the successful way the shock dynamics in the two cases, indicating, for laser intensities around 1.5x1015 W/cm2 at 3ω, an ablation pressure of (90 ± 20) Mbar and (120 ± 20) Mbar in planar and hemispherical geometry respectively.
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