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

9th International Conference on Inertial Fusion Sciences and Applications

Dittrich, T.R.^1 ; Hurricane, O.A.^1 ; Berzak-Hopkins, L.F.^1 ; Callahan, D.A.^1 ; Casey, D.T.^1 ; Clark, D.^1 ; Dewald, E.L.^1 ; Doeppner, T.^1 ; Haan, S.W.^1 ; Hammel, B.A.^1 ; Harte, J.A.^1 ; Hinkel, D.E.^1 ; Kozioziemski, B.J.^1 ; Kritcher, A.L.^1 ; Ma, T.^1 ; Nikroo, A.^1 ; Pak, A.E.^1 ; Parham, T.G.^1 ; Park, H.-S.^1 ; Patel, P.K.^1 ; Remington, B.A.^1 ; Salmonson, J.D.^1 ; Springer, P.T.^1 ; Weber, C.R.^1 ; Zimmerman, G.B.^1 ; Kline, J.L.^2

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;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/717/1/012013/pdf
DOI  :  10.1088/1742-6596/717/1/012013

来源: IOP

【 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.