Direct-drive implosion physics: Results from OMEGA and the National Ignition Facility

8th International Conference on Inertial Fusion Sciences and Applications

Radha, P.B.^1 ; Goncharov, V.N.^1 ; Hohenberger, M.^1 ; Sangster, T.C.^1 ; Betti, R.^1 ; Craxton, R.S.^1 ; Edgell, D.H.^1 ; Epstein, R.^1 ; Froula, D.H.^1 ; Marozas, J.A.^1 ; Marshall, F.J.^1 ; McCrory, R.L.^1 ; McKenty, P.W.^1 ; Meyerhofer, D.D.^1 ; Michel, D.T.^1 ; Hu, S.X.^1 ; Seka, W.^1 ; Shvydky, A.^1 ; Skupsky, S.^1 ; Frenje, J.A.^2 ; Gatu-Johnson, M.^2 ; Petrasso, R.D.^2 ; Ma, T.^3 ; Le Pape, S.^3 ; MacKinnon, A.J.^3

Laboratory for Laser Energetics, University of Rochester, Rochester

NY, United States^1

Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge

MA, United States^2

Lawrence Livermore National Laboratory, Livermore

CA, United States^3

关键词: Cross beams;    Direct drive implosion;    Hydrodynamic parameters;    Laser-plasma interactions;    Measurements of;    National ignition facility;    Nonuniformity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/688/1/012006/pdf
DOI  :  10.1088/1742-6596/688/1/012006

来源: IOP

【 摘 要 】

Direct-drive-implosion experiments from both OMEGA and the National Ignition Facility (NIF) are critical to gain confidence in ignition predictions on the NIF. Adequate performance of hydrodynamically scaled 1.8-MJ ignition designs must be obtained on OMEGA at 26 kJ. Implosions on the NIF must be used to identify and mitigate the effect of laser-plasma interactions (LPI's) on hydrodynamic parameters at the NIF scale. Results from spherically driven OMEGA cryogenic implosion experiments are described. Mitigation of nonuniformity sources and cross-beam energy transfer (CBET) is important for improving target performance on OMEGA. Initial polar-driven implosion experiments on the NIF have provided valuable measurements of trajectory and symmetry. Simulations that include the effect of CBET more closely reproduce the observed velocity.