In-situ Surface Debris Inspection and Removal System for Upward-Facing Transport Mirrors of the National Ignition Facility.

Gourdin, W. H. ; Dzenitis, E. ; Martin, D. ; Listiyo, K. ; Sherman, G. ; Kent, W. ; Butlin, R. ; Stolz, C. J. ; Pryatel, J.

Technical Information Center Oak Ridge Tennessee

关键词: Mirrors;    Surface debris;    Inertial confinement;    Lasers;    Illuminance;   

RP-ID  :  DE2005313423

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

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(sup o)) illumination with a bar light highlights debris (approx.) 10 (micro)m 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 (micro)m show that particle removal efficiency is near 100% over most of the mirror surfaces for all sizes tested.