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Proceedings Paper

Ghost analysis visualization techniques for complex systems: examples from the NIF final optics assembly
Author(s): James L. Hendrix; John Charles Schweyen; Jeffrey Rowe; Glenn Beer
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Paper Abstract

The stray light or 'ghost' analysis of the NIF Final Optics Assembly (FOA) has proved to be one of the most complex ghost analyses ever attempted. The NIF FOA consists of a bundle of four beam lines that: 1) provides the vacuum seal to the target chamber, 2) converts 1 (omega) to 3 (omega) light, 3) focuses the light on the target, 4) separates a fraction of the 3 (omega) beam for energy diagnostics, 5) separates the three wavelengths to diffract unwanted 1 (omega) and 2 (omega) light away from the target, 6) provides spatial beam smoothing, and 7) provides a debris barrier between the target chamber and the switchyard mirrors. The three wavelengths of light and even optical elements with three diffractive optic surfaces generate three million ghosts through 4th order. Approximately 24,000 of these ghosts have peak fluence exceeding 1 J/cm2. The shear number of ghost paths requires a visualization method that allows overlapping ghosts on optics and mechanical components to be summoned and then mapped to the optical and mechanical component surfaces in 3D space. This paper addresses the following aspects of the NIF Final Optics Ghost analysis: 1) materials issues for stray light mitigation, 2) limitations of current software tools, 3) computer resource limitations affecting automated coherent raytracing, 4) folding the stray light analysis into the opto-mechanical design process, 5) analysis and visualization tools from simple hand calculations to specialized stray light analysis computer codes, and 6) attempts at visualizing these ghosts using a CAD model and another using a high end data visualization software approach.

Paper Details

Date Published: 23 July 1999
PDF: 15 pages
Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, (23 July 1999); doi: 10.1117/12.354142
Show Author Affiliations
James L. Hendrix, AlliedSignal Inc. (United States)
John Charles Schweyen, Breault Research Organization, Inc. (United States)
Jeffrey Rowe, Lawrence Livermore National Lab. (United States)
Glenn Beer, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 3492:
Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion
W. Howard Lowdermilk, Editor(s)

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