The T2K Fine-Grained Detectors

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.

• arXiv preprint: https://arxiv.org/abs/1204.3666
• Reference: Nucl. Instrum. Meth. A 696, 1 (2012)
• DOI: https://doi.org/10.1016/j.nima.2012.08.020