vacuum deposition thin film coatings facility at lab 7
DESCRIPTION
Vacuum Deposition Thin Film Coatings Facility at Lab 7. Eileen Hahn. Services Offered. Optical fiber and connector polishing Fiber splicing Evaporated and sputtered coatings, especially fiber mirroring Cleaning and bake-out for UHV parts - PowerPoint PPT PresentationTRANSCRIPT
6/8/2006 Particle Physics Division Technical Centers
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Vacuum Deposition Thin Film Coatings Facility at Lab 7
Eileen Hahn
6/8/2006 Particle Physics Division Technical Centers
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Services Offered Optical fiber and connector polishing Fiber splicing Evaporated and sputtered coatings,
especially fiber mirroring Cleaning and bake-out for UHV parts High temperature vacuum furnace
(1200 C) -hydrogen degassing of SRF cavities
RGA and out-gassing studies Plasma etching
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High Output Production History of Optical Fiber Polishing & Mirroring
CDF Plug and Muon Tracker CMS HCAL CREAM D0 Central Fiber Tracker, VLPC Production,
ICD, Forward Pre-Shower & Forward Proton Detectors
NASA-GLAST PHENIX STAR-EMC Fiber barrel & End cap
Polished >1,000,000 fibers Mirrored >500,000 fibers
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Polish and Mirror Processing of Optic Fibers
“Ice Polishing” Quality Control Preparation for Mirroring Sputter Deposition in Vacuum Optional UV epoxy coating of mirrored
ends Transport Packaging
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“Ice Polishing” of Optical Fibers 2 programmable diamond polishers built at
Fermilab specially engineered to reduce/eliminate vibration
Frozen water clamps fibers eliminating chatter and lubricates allowing for high rpm and slow feed recipe for high quality polish
Fabricate special hex fixtures to hold fiber bundles normal to cut Individual Fibers ranging from 0.35mm to
2mm diameters Round and square cross section fibers Setup for fiber lengths from 5cm to
10m Rate of production is dependent on diameter
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Quality Controls Daily testing procedure of polishing results Attention to machine maintenance Log keeping Visual inspection of fiber polish under
magnification Monitoring of sputter process, tracking
identification and visual inspection Reflectivity testing has been handled by
the experimenters –Reflectivty rates have ranged from 80% to 90% consistently
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Prep for Mirroring of Optical Fiber ends Amber room lights for light sensitive fibers
(such as 3HF) Experienced handling and cleaning of
delicate fibers All fibers handled with CR100 rated gloves
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Sputter Deposition System for Aluminizing fiber ends
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Fiber Mirroring Sputter Process
2 vacuum systems specifically built and dedicated to optical fiber sputtering
Varying diameters & lengths can be mirrored - systems were designed to accommodate production lengths of 2.5 meters. Auxiliary extension will handle 3.5 meter long fibers
Sputter load dependent on diameter - typically 500 to 2000 fibers per pump down per unit
99.999% chemically pure aluminum target Very pure argon gas “Sputtering Grade” used 3000 Angstrom thick coating monitored with
oscillating quartz crystal sensor Magnetron sputtering gun driven by DC power supply