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>Characterization and repair of small damage sites and their impact on the lifetime of fused silica optics on the National Ignition Facility
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Characterization and repair of small damage sites and their impact on the lifetime of fused silica optics on the National Ignition Facility
The National Ignition Facility (NIF) uses an in-situ system called the Final Optics Damage Inspection (FODI)system to monitor the extent of damage on installed optical components. Among this system's uses is to alertoperators when damage sites on a Grating Debris Shield (GDS) require repair (≈300 microns) and triggers theremoval of the damaged optic. FODI, which can reliably detect damage sites larger than 50 microns, records thesize and location of observed sub-critical damage observed on the optic, so each of these sites can be repairedbefore the optic is next installed. However, by only identifying, and hence repairing sites larger than ≈50microns, optics are left with numerous smaller sites, some fraction of which resume growing when the host opticis reinstalled. This work presents a method of identifying and repairing damage sites below the FODI detectionlimit that have a significant probability of growth. High resolution images are collected of all likely damagecandidates on each optic, and a machine learning based automated classification algorithm is used to determineif each candidate is a damage site or something benign (particle, previously repaired site, etc.). Any damage sitegreater than 20 microns is agged for subsequent repair. By repairing these smaller sites, recycled optics had a40% increased lifetime on the NIF.
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