Physics – Plasma Physics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..dppkwo206t&link_type=abstract
American Physical Society, Division of Plasma Physics Meeting, November 17-21, 1997, abstract #kWeaO206.
Physics
Plasma Physics
Scientific paper
Development of ignition targets for the NIF relies heavily on computational modeling, and it is crucial that our codes are calibrated against relevant experimental data. Of particular importance is our ability to model the effects of perturbations to the implosion that arise from laser-drive nonuniformities and asymmetry and from target fabrication limitations. We report on progress toward design of direct-drive cylindrical targets that will help benchmark our capabilities to model instability growth in ablatively driven, convergent geometries. Our baseline target planned for the University of Rochester's Omega laser utilizes a polystyrene shell of 430 μm inner radius. The twice-larger scale (than previous Nova experiments) enhances diagnostic access and imaging resolution and facilitates instability growth over longer time intervals and to higher convergence than realized at Nova. Energetically feasible target models exhibit roughly 2--3 times the Nova convergence but at 1/2--1/3, respectively, the mean acceleration achieved at Nova. Two-dimensional computations, driven realistically using the Omega geodesic beam array, are underway to fix target geometry (dimensions and overall shape), to address diagnostic feasibility, and to assess the stability of the imploding shell to perturbations induced by m=5 and 10 modes inherent in the target illumination.
Barnes Cris W.
Beck J. B.
Hoffman Nelson M.
Tubbs David L.
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