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Proceedings Paper

Insitu surface debris inspection and removal system for upward-facing transport mirrors of the National Ignition Facility
Author(s): William H. Gourdin; Elizabeth G. Dzenitis; David A. Martin; Kalvin Listiyo; Gregory A. Sherman; William H. Kent; Rebecca K. Butlin; Christopher J. Stolz; James A. Pryatel
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Paper Abstract

We describe a system to inspect and remove surface debris in-situ from the surfaces of upward-facing mirrors that transport 1053 nm laser light to the target chamber of the National Ignition Facility (NIF) at the Lawrence Livermore National Laboratory. Grazing angle (2-5°) illumination with a bar light highlights debris ≈10 mm in size and larger, which is then viewed through windows in the enclosures of selected mirrors. Debris is removed with 1-second bursts of high velocity (76 m/s) clean air delivered across the optic surfaces by a commercially available linear nozzle ("gas knife"). Experiments with aluminum, stainless steel, glass and polystyrene particles of various sizes >30 mm show that particle removal efficiency is near 100% over most of the mirror surfaces for all sizes tested.

Paper Details

Date Published: 21 February 2005
PDF: 13 pages
Proc. SPIE 5647, Laser-Induced Damage in Optical Materials: 2004, (21 February 2005); doi: 10.1117/12.585077
Show Author Affiliations
William H. Gourdin, Lawrence Livermore National Lab. (United States)
Elizabeth G. Dzenitis, Lawrence Livermore National Lab. (United States)
David A. Martin, Lawrence Livermore National Lab. (United States)
Kalvin Listiyo, Lawrence Livermore National Lab. (United States)
Gregory A. Sherman, Lawrence Livermore National Lab. (United States)
William H. Kent, Lawrence Livermore National Lab. (United States)
Rebecca K. Butlin, Lawrence Livermore National Lab. (United States)
Christopher J. Stolz, Lawrence Livermore National Lab. (United States)
James A. Pryatel, Experimental Engineering, Inc. (United States)


Published in SPIE Proceedings Vol. 5647:
Laser-Induced Damage in Optical Materials: 2004
Gregory J. Exarhos; Arthur H. Guenther; Norbert Kaiser; Keith L. Lewis; M. J. Soileau; Christopher J. Stolz, Editor(s)

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