We describe our R&D effort to develop potentially radiation-hard scintillating and wavelength shifting fibers by doping fused-silica with cerium. The cerium-doped optical fibers with different core structures and concentrations were exposed to gamma radiation ( 60 Co) at different dose rates up to 100 kGy. We evaluated the radiation-induced degradation in photoluminescence, optical transmission, and recovery phenomena in the wavelength range from 300 to 700 nm. We were able to model the experimental data based on second-order rate equations where the fit parameters that govern the damage profile were utilized to predict recovery. We also measured the influence of radiation on the numerical aperture. Finally, we offer some thoughts on the use of these types of fibers in particle and nuclear physics detectors.

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A: We have evaluated the performance of a Ce-doped fused-silica fiber as wavelength shifter coupled to a CeF 3 crystal using electron beams at CERN. The pulse shape and collection efficiency were measured using irradiated (100 kGy) and un-irradiated fibers. In addition, we evaluated the light yield of various Ce-doped fibers and explored the possibility of using them in the future, including for precision timing applications in a high-luminosity collider environment. K: Cerium, optical fibers, fused silica Experimental SetupThe tests described here were performed in the H4 beam line of the CERN SPS North Area, which provides high-purity electron beams with energies between 20 and 250 GeV. Four plastic scintillating counters of varying size, the smallest of which has a transverse dimension of 1 × 1 cm 2 , were placed in the beamline for triggering purposes. The data were acquired with a custom DAQ system [3], which utilizes a CAEN2 V1742 VME board. The V1742 includes 4 DRS4 chips [4]