Update on design simulations for NIF ignition targets, and the
rollup of all specifications into an error budget |
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Authors: | S W Haan M C Herrmann J D Salmonson P A Amendt D A Callahan T R Dittrich M J Edwards O S Jones M M Marinak D H Munro S M Pollaine B K Spears L J Suter |
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Institution: | (1) Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94551, USA |
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Abstract: | Targets intended to produce ignition on NIF are being simulated and the simulations are used to set specifications for target
fabrication and other program elements. Recent design work has focused on designs that assume only 1.0 MJ of laser energy
instead of the previous 1.6 MJ. To perform with less laser energy, the hohlraum has been redesigned to be more efficient than
previously, and the capsules are slightly smaller. Three hohlraum designs are being examined: gas fill, SiO2 foam fill, and SiO2 lined. All have a cocktail wall, and shields mounted between the capsule and the laser entrance holes. Two capsule designs
are being considered. One has a graded doped Be(Cu) ablator, and the other graded doped CH(Ge). Both can perform acceptably
with recently demonstrated ice layer quality, and with recently demonstrated outer surface roughness. Complete tables of specifications
are being prepared for both targets, to be completed this fiscal year. All the specifications are being rolled together into
an error budget indicating adequate margin for ignition with the new designs. The dominant source of error is hohlraum asymmetry
at intermediate modes 4–8, indicating the importance of experimental techniques to measure and control this asymmetry. |
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Keywords: | 52 57 -z Laser inertial confinement 52 57 Bc Target design and fabrication 52 57 Fg Implosion symmetry and hydrodynamic instability (Rayleigh-Taylor Richtmyer-Meshkov imprint etc ) |
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