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Measurements are presented of the reduction of signal output due to radiationdamage for plastic scintillator tiles used in the hadron endcap (HE)calorimeter of the CMS detector. The tiles were exposed to particles producedin proton-proton (pp) collisions at the CERN LHC with a center-of-mass energyof 13 TeV, corresponding to a delivered luminosity of 50 fb$^{-1}$. Themeasurements are based on readout channels of the HE that were instrumentedwith silicon photomultipliers, and are derived using data from several sources:a laser calibration system, a movable radioactive source, as well as hadronsand muons produced in pp collisions. Results from several irradiation campaignsusing $^{60}$Co sources are also discussed. The damage is presented as afunction of dose rate. Within the range of these measurements, for a fixed dosethe damage increases with decreasing dose rate.

journal of instrumentation

Measurements with silicon photomultipliers of dose-rate effects in the  radiation damage of plastic scintillator tiles in the CMS hadron endcap  calorimeter