A device to characterize optical fibres

Authors :: Davide Costanzo
A. Vasiljev
Vincenzo Cavasinni
E. Mazzoni
Filippo Bosi
Chiara Roda
T. Del Prete
Sergey Burdin
V. Flaminio
Giulio Usai
Publication Year :: 2001
Publisher :: arXiv, 2001.
Abstract: ATLAS is a general purpose experiment approved for the LHC collider at CERN. An important component of the detector is the central hadronic calorimeter; for its construction more than 600,000 Wave Length Shifting (WLS) fibres (corresponding to a total length of 1,120 Km) have been used. We have built and put into operation a dedicated instrument for the measurement of light yield and attenuation length over groups of 20 fibres at a time. The overall accuracy achieved in the measurement of light yield (attenuation length) is 1.5% (3%). We also report the results obtained using this method in the quality control of a large sample of fibres.<br />Comment: 17 pages 20 figeres submitted to NIM journal