Convergent ablation measurements with gas-filled rugby hohlraum on OMEGA

8th International Conference on Inertial Fusion Sciences and Applications

Casner, A.^1 ; Jalinaud, T.^1 ; Galmiche, D.^1

CEA, DAM, DIF, Arpajon

F-91297, France^1

关键词: Ablation experiments;    Ablation fronts;    Alternate layers;    Doped polymers;    OMEGA Laser Facility;    Planar geometries;    Rayleigh-Taylor growth;    X-ray framing camera;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/688/1/012008/pdf
DOI  :  10.1088/1742-6596/688/1/012008

来源: IOP

【 摘 要 】

Convergent ablation experiments with gas-filled rugby hohlraum were performed for the first time on the OMEGA laser facility. A time resolved 1D streaked radiography of capsule implosion is acquired in the direction perpendicular to hohlraum axis, whereas a 2D gated radiography is acquired at the same time along the hohlraum axis on a x-ray framing camera. The implosion trajectory has been measured for various kinds of uniformly doped ablators, including germanium-doped and silicon-doped polymers (CH), at two different doping fraction (2% and 4% at.). Our experiments aimed also at measuring the implosion performance of laminated capsules. A laminated ablator is constituted by thin alternate layers of un-doped and doped CH. It has been previously shown in planar geometry that laminated ablators could mitigate Rayleigh Taylor growth at ablation front. Our results confirm that the implosion of a capsule constituted with a uniform or laminated ablator behaves similarly, in accordance with post-shot simulations performed with the CEA hydrocode FCI2.