Author/Authors :
Amaudruz، نويسنده , , P.-A. and Barbi، نويسنده , , M. and Bishop، نويسنده , , D. and Braam، نويسنده , , N. and Brook-Roberge، نويسنده , , D.G. and Giffin، نويسنده , , S. and Gomi، نويسنده , , Zachary S. and Gumplinger، نويسنده , , P. and Hamano، نويسنده , , K. and Hastings، نويسنده , , N.C. and Hastings، نويسنده , , S. and Helmer، نويسنده , , R.L. and Henderson، نويسنده , , R. and Ieki، نويسنده , , K. and Jamieson، نويسنده , , Drazen B. and Kato، نويسنده ,
Abstract :
T2K is a long-baseline neutrino oscillation experiment searching for ν e appearance in a ν μ beam. The beam is produced at the J-PARC accelerator complex in Tokai, Japan, and the neutrinos are detected by the Super-Kamiokande detector located 295 km away in Kamioka. A suite of near detectors (ND280) located 280 m downstream of the production target is used to characterize the components of the beam before they have had a chance to oscillate and to better understand various neutrino interactions on several nuclei. This paper describes the design and construction of two massive fine-grained detectors (FGDs) that serve as active targets in the ND280 tracker. One FGD is composed solely of scintillator bars while the other is partly scintillator and partly water. Each element of the FGDs is described, including the wavelength shifting fiber and Multi-Pixel Photon Counter used to collect the light signals, the readout electronics, and the calibration system. Initial tests and in situ results of the FGDsʹ performance are also presented.
Keywords :
T2K , Multi-pixel photon counter , Wavelength shifting fiber , Readout electronics , Neutrino oscillation , Calibration , Scintillation tracking detector
