DOIAbstract
Light monitoring will play a crucial role in maintaining the energy resolution of the CMS electromagnetic calorimeter, by providing transparency corrections for its 75,848 lead tungstate (PbWO4) crystals. To maintain the resolution of the calorimeter, the variation in the light output of the PbWO4 crystals in the harsh radiation environment of the LHC is corrected for by using a light monitoring system. The design of the light monitoring system, as well as the performance during test beams, is discussed
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