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The aluminization of 600 k WLS fibers for the TileCal/ATLAS/LHC
2004 / IEEE
This item was taken from the IEEE Periodical ' The aluminization of 600 k WLS fibers for the TileCal/ATLAS/LHC ' The TILE CALorimeter, the hadronic sampling calorimeter of ATLAS/LHC/CERN, is made of iron and polystyrene scintillating tiles. The light produced in scintillating tiles is absorbed and guided to the photomultipliers (PMTs) through wave length shifter (WLS) optical fibers. To optimize the detection of jets and muons, the top of the fibers away of the PMTs is coated with an aluminum mirror. This aluminum mirror is produced by planar magnetron sputtering. This process adds to an excellent reproducibility a minimal thermal aggression, important for a proper film adhesion to the plastic surface. To satisfy schedule and optical critical requirements, a dedicated mass production machine named SIDELO II was projected and constructed. A reflectivity of R/spl sim/75% is achieved and the light output uniformity improved by /spl sime/10%. The aluminization of the fibers and their quality control started in August 1999 and went on continuously until May 2002. The quality control results showed a reproducibility over the optical characteristics of the fibers that fully accomplish the ATLAS requirements.
Position Sensitive Particle Detectors
Wls Optical Fibers
Hadronic Sampling Calorimeter
Iron Scintillating Tiles
Polystyrene Scintillating Tiles
Wave Length Shifter
Planar Magnetron Sputtering
Minimal Thermal Aggression
Proper Film Adhesion
Optical Critical Requirements
Sidelo Ii Dedicated Mass Production Machine
Light Output Uniformity
Large Hadron Collider
Reproducibility Of Results
Solid Scintillation Detectors