The Tokai-to-Kamioka (T2K) experiment is a second generation long baseline neutrino oscillation experiment which aims at a sensitive search for νe appearance. The main design features of the T2K near neutrino detectors located at 280 m from the target are presented, and the scintillator counters are described. The counters are readout via WLS fibers embedded into S-shaped grooves in the scintillator from both ends by multi-pixel avalanche photodiodes operating in a limited Geiger mode. Operating principles and results of tests of photosensors with a sensitive area of 1 mm2 are presented. A time resolution of 1.75 ns, a spatial resolution of 9.9 - 12.4 cm, and a detection efficiency for minimum ionizing particles of more than 99% were obtained for scintillator detectors in a beam test. © 2007 Elsevier B.V. All rights reserved.
Publication Source (Journal or Book title)
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Mineev, O., Afanasjev, A., Bondarenko, G., Golovin, V., Gushchin, E., Izmailov, A., Khabibullin, M., Khotjantsev, A., Kudenko, Y., Kurimoto, Y., Kutter, T., Lubsandorzhiev, B., Mayatski, V., Musienko, Y., Nakaya, T., Nobuhara, T., Shaibonov, B., Shaikhiev, A., Taguchi, M., Yershov, N., & Yokoyama, M. (2007). Scintillator counters with multi-pixel avalanche photodiode readout for the ND280 detector of the T2K experiment. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 577 (3), 540-551. https://doi.org/10.1016/j.nima.2007.04.161