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Vacuum Deposition Thin Film Coatings Facility at Lab 7

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

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Vacuum Deposition Thin Film Coatings Facility at Lab 7

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  1. Vacuum Deposition Thin Film Coatings Facility at Lab 7 Eileen Hahn Particle Physics Division Technical Centers

  2. 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 Particle Physics Division Technical Centers

  3. 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 Particle Physics Division Technical Centers

  4. 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 Particle Physics Division Technical Centers

  5. “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 Particle Physics Division Technical Centers

  6. 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 Particle Physics Division Technical Centers

  7. 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 Particle Physics Division Technical Centers

  8. Sputter Deposition System for Aluminizing fiber ends Particle Physics Division Technical Centers

  9. 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 Particle Physics Division Technical Centers

  10. Summary • We have been providing this service over the last 15 years • Supporting • FNAL experiments • University R&D • DOE and International Facilities • On time and on budget!! Particle Physics Division Technical Centers

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