Performance of New Kuraray Wavelength-shifting Fibers with Short Decay Time

Abstract We measure the decay time and the attenuation length of newly developed wavelength-shifting fibers, the YS series, from Kuraray, which have a fast response. Using a 405 nm laser, the decay times of YS-2, 4, and 6 are measured to be 3.64 ± 0.04, 2.15 ± 0.03, and 1.47 ± 0.02 ns, respectively, for a light injection distance of 10 cm. The decay time of Y-11 is measured to be 7.10 ± 0.09 ns using the same system. All fibers are found to have similar attenuation lengths of more than 4 m. When combined with the plastic scintillators EJ-200 and EJ-204, the YS series has better time resolution than Y-11, with light yields of 60–100% of Y-11.