Development of two-dimensional scintillation neutron detectors at J-PARC

Nakamura, Tatsuya  ; To, Kentaro  ; Sakasai, Kaoru  

We have developed scintillator-based neutron detectors by using wavelength-shifting (WLS) fiber technology for the MLF. The two-dimensional scintillator detectors we involved in the development were for single crystal neutron diffractometers iBIX and SENJU, where the pixel sizes of the detectors were optimized depending on the requirements, from 0.50.5 to 44 mm. Based on this fiber technology we have enlarged a neutron-sensitive with a required pixel size for engineering materials diffractometer, TAKUMI. The WLS fiber technology has given us flexibility to design the pixel size to 55 mm with a neutron-sensitive area of 320320 mm. With the extension of this technique we plan to develop a larger area detector for SENJU, which has a neutron-sensitive area of 512512 mm. In this paper details and recent progress of the detector development will be presented.