The T2K fine-grained detectors

P. A. Amaudruz, M. Barbi, D. Bishop, N. Braam, D. G. Brook-Roberge, S. Giffin, S. Gomi, P. Gumplinger, K. Hamano, N. C. Hastings, S. Hastings, R. L. Helmer, R. Henderson, K. Ieki, B. Jamieson, I. Kato, N. Khan, J. Kim, B. Kirby, P. KitchingA. Konaka, M. Lenckowski, C. Licciardi, T. Lindner, K. Mahn, E. L. Mathie, C. Metelko, C. A. Miller, A. Minamino, K. Mizouchi, T. Nakaya, K. Nitta, C. Ohlmann, K. Olchanski, S. M. Oser, M. Otani, P. Poffenberger, R. Poutissou, J. M. Poutissou, W. Qian, F. Retiere, R. Tacik, H. A. Tanaka, P. Vincent, M. Wilking, S. Yen, M. Yokoyama

Research output: Contribution to journalArticlepeer-review

100 Scopus citations


T2K is a long-baseline neutrino oscillation experiment searching for νe appearance in a νμ 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 FGDs performance are also presented.

Original languageEnglish (US)
Pages (from-to)1-31
Number of pages31
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
StatePublished - Dec 22 2012
Externally publishedYes

Bibliographical note

Funding Information:
We would like to thank the support of the following agencies that made the T2K FGD project possible: Canada Foundation for Innovation, the Natural Sciences and Engineering Research Council (NSERC) of Canada, TRIUMF, and the National Research Council, Canada; MEXT and JSPS with Grant-in-Aid for Scientific Research on Priority Areas 18071007 , Young Scientists S 20674004 , JSPS Fellows, the Global COE Program “The Next Generation of Physics, Spun from Universality and Emergence”, Japan; and by the UK Science and Technology Facilities Council STFC, UK.


  • Calibration
  • Multi-Pixel Photon Counter
  • Neutrino oscillation
  • Readout electronics
  • Scintillation tracking detector
  • T2K
  • Wavelength shifting fiber


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