21 February 2005 Insitu surface debris inspection and removal system for upward-facing transport mirrors of the National Ignition Facility
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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.
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William H. Gourdin, William H. Gourdin, Elizabeth G. Dzenitis, Elizabeth G. Dzenitis, David A. Martin, David A. Martin, Kalvin Listiyo, Kalvin Listiyo, Gregory A. Sherman, Gregory A. Sherman, William H. Kent, William H. Kent, Rebecca K. Butlin, Rebecca K. Butlin, Christopher J. Stolz, Christopher J. Stolz, James A. Pryatel, James A. Pryatel, } "Insitu surface debris inspection and removal system for upward-facing transport mirrors of the National Ignition Facility", Proc. SPIE 5647, Laser-Induced Damage in Optical Materials: 2004, (21 February 2005); doi: 10.1117/12.585077; https://doi.org/10.1117/12.585077
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