Author/Authors :
Mineev، نويسنده , , O. and Afanasjev، نويسنده , , A. and Bondarenko، نويسنده , , G. and Golovin، نويسنده , , V. and Gushchin، نويسنده , , E. and Izmailov، نويسنده , , A. and Khabibullin، نويسنده , , M. and Khotjantsev، نويسنده , , A. and Kudenko، نويسنده , , Yu. and Kurimoto، نويسنده , , Y. and Kutter، نويسنده , , T. and Lubsandorzhiev، نويسنده , , B. and Mayatski، نويسنده , , V. and Musienko، نويسنده , , Yu. and Nakaya، نويسنده , , T. and Nobuhara، نويسنده , , T. and Shaibonov، نويسنده , , B.A.J. and Shaikhiev، نويسنده , , A. and Taguchi، نويسنده , , M. and Yershov، نويسنده , , N. N. YOKOYAMA، نويسنده , , M.، نويسنده ,
Abstract :
The Tokai-to-Kamioka (T2K) experiment is a second generation long baseline neutrino oscillation experiment which aims at a sensitive search for ν e 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 mm 2 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.
Keywords :
Photosensors , Neutrino detectors , WLS readout , Multi-pixel APD
