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Proceedings Article

Ghost analysis visualization techniques for complex systems: examples from the NIF final optics assembly

[+] Author Affiliations
James L. Hendrix

AlliedSignal Inc. (USA)

John C. Schweyen

Breault Research Organization, Inc. (USA)

Jeffrey Rowe, Glenn Beer

Lawrence Livermore National Lab. (USA)

Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, 306 (July 23, 1999); doi:10.1117/12.354142
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From Conference Volume 3492

  • Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion
  • W. Howard Lowdermilk
  • Monterey, CA | June 07, 1998

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.

© (1999) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

James L. Hendrix ; John C. Schweyen ; Jeffrey Rowe and Glenn Beer
"Ghost analysis visualization techniques for complex systems: examples from the NIF final optics assembly", Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, 306 (July 23, 1999); doi:10.1117/12.354142; http://dx.doi.org/10.1117/12.354142


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