STATE-OF-ART OF (GREEN) WAVELENGTHSHIFTING FIBERS

Comparative studies of the optical properties of polystyrene WLS fiber s for High Energy Physics Experiments are presented. The response of f ibers to the blue light of a plastic scintillator is compared for fibe rs with different dopant concentration, with single and multiple cladd ing, and with several Ultra Violet Absorbers (UVA) with different conc entrations. Preliminary results on the mechanical stress of the fibers are shown and a brief summary of the radiation hardness is given.