Simulations of fill tube effects on the implosion of high-foot NIF ignition capsules

[摘要] Encouraging results have been obtained using a strong first shock during the implosion of carbon-based ablator ignition capsules. These "high-foot" implosion results show that capsule performance deviates from 1D expectations as laser power and energy are increased. A possible cause of this deviation is the disruption of the hot spot by jets originating in the capsule fill tube. Nominally, a 10 μm outside diameter glass (SiO2) fill tube is used in these implosions. Simulations indicate that a thin coating of Au on this glass tube may lessen the hotspot disruption. These results and other mitigation strategies will be presented.

[发布机构] Lawrence Livermore National Laboratory, Livermore; CA; 94551, United States^1;Los Alamos National Laboratory, Los Alamos; NM; 87545, United States^2

[关键词] Ablators;Carbon-based;Fill tubes;Glass tubes;Ignition capsules;Mitigation strategy;Outside diameter;Thin coating