THE PERFORMANCE OF THE MULTI-CHANNEL HYBRID PHOTODIODES FOR CMS HCAL

摘要

The CMS Tile-fiber Hadronic Calorimeter is read out by multi-channel hybrid photodiodes. At almost 10,000 channels, this is the largest application of this new technology in one integrated detector system. A 5 year development project has produced custom tubes that achieve high-rate, low-crosstalk operation in a 4 Tesla magnetic field and remain stable in a high radiation environment for the 10-yr lifetime of the CMS experiment. The specifications are rigorous and are maintained by a set of automated Quality Assurance stations and a web-accessible database.