Hydrodynamic instabilities and mix studies on NIF: predictions, observations, and a path forward

8th International Conference on Inertial Fusion Sciences and Applications

Remington, B.A.^1 ; Atherton, L.J.^1 ; Benedetti, L.R.^1 ; Berzak-Hopkins, L.^1 ; Bradley, D.K.^1 ; Callahan, D.A.^1 ; Casey, D.T.^1 ; Celliers, P.M.^1 ; Cerjan, C.J.^1 ; Clark, D.S.^1 ; Dewald, E.L.^1 ; Dittrich, T.R.^1 ; Dixit, S.N.^1 ; Döppner, T.^1 ; Edgell, D.H.^1 ; Edwards, M.J.^1 ; Epstein, R.^2 ; Frenje, J.^3 ; Gatu-Johnson, M.^3 ; Glenn, S.^1 ; Glenzer, S.H.^4 ; Grim, G.^5 ; Haan, S.W.^1 ; Hammel, B.A.^1 ; Hamza, A.^1 ; Hicks, D.^1 ; Hsing, W.W.^1 ; Hurricane, O.^1 ; Izumi, N.^1 ; Jones, O.S.^1 ; Key, M.H.^1 ; Khan, S.F.^1 ; Kilkenny, J.D.^6 ; Kline, J.L.^5 ; Kyrala, G.A.^5 ; Landen, O.L.^1 ; Le Pape, S.^1 ; Lindl, J.D.^1 ; Ma, T.^1 ; MacGowan, B.J.^1 ; MacKinnon, A.J.^1 ; MacPhee, A.G.^1 ; Meezan, N.B.^1 ; Moody, J.D.^1 ; Moses, E.I.^1 ; Nikroo, A.^6 ; Pak, A.^1 ; Parham, T.^1 ; Park, H.-S.^1 ; Patel, P.K.^1 ; Petrasso, R.^3 ; Pino, J.^1 ; Ralph, J.E.^1 ; Raman, K.^1 ; Regan, S.P.^2 ; Robey, H.F.^1 ; Ross, J.S.^1 ; Spears, B.K.^1 ; Smalyuk, V.A.^1 ; Springer, P.T.^1 ; Suter, L.J.^1 ; Tipton, R.^1 ; Tommasini, R.^1 ; Town, R.P.^1 ; Weber, S.V.^1

Lawrence Livermore National Laboratory, 7000 East Ave., Livermore

CA

94550, United States^1

Laboratory for Laser Energetics, University of Rochester, Rochester

NY

14623, United States^2

Massachusetts Institute of Technology, Cambridge

MA, United States^3

SLAC National Accelerator Laboratory, 2575 Sand Hill Rd., Menlo Park

CA

94025, United States^4

Los Alamos National Laboratory, Los Alamos

NM

87545, United States^5

General Atomics, 3550 General Atomics Court, San Diego

CA

29186, United States^6

关键词: 1-D simulation;    Ablation fronts;    Dopant levels;    Hydrodynamic instabilities;    Material mixing;    Mitigation methods;    Neutron yields;    Rayleigh-Taylor instabilities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/688/1/012090/pdf
DOI  :  10.1088/1742-6596/688/1/012090

来源: IOP

【 摘 要 】

The goals of the Mix Campaign are to determine how mix affects performance, locate the "mix cliff", locate the source of the mix, and develop mitigation methods that allow performance to be increased. We have used several different drive pulse shapes and capsule designs in the Mix Campaign, to understand sensitivity to drive peak power, level of coast, rise time to peak power, adiabat, and dopant level in the capsule. Ablator material mixing into the hot spot has been shown conclusively with x-ray spectroscopy. The observed neutron yield drops steeply when the hot spot mix mass becomes too large. The mix appears to be driven by ablation- front Rayleigh-Taylor instabilities. A high foot, higher adiabat drive has a more stable ablation front and has allowed the mix mass in the hot spot to be reduced significantly. Two recent high foot shots achieved neutron yields > 1015and measured neutron yield over clean 1D simulation (YOC) > 50%, which was one of the central goals of the Mix Campaign.