Upgrade of two-dimensional scintillation neutron detectors for single crystal diffractometer SENJU at J-PARC MLF

Nakamura, Tatsuya  ; To, Kentaro  ; Kiyanagi, Ryoji  ; Ohara, Takashi   ; Hosoya, Takaaki; Tobe, Masahiro; Hishinuma, Yukio*; Ebine, Masumi ; Sakasai, Kaoru  

Upgrade of two two-dimensional scintillation neutron detectors for SENJU diffractometer at the Materials and Life science experimental Facility in the Japan Proton Accelerator Research Complex (J-PARC MLF) is underway. The current status of detector development for this project is briefly reviewed. The detector upgrade plan includes detector developments such as thin add-in detectors, high efficiency detectors to replace the original detectors, a large area detector placed under the sample vacuum tank, rectangular shaped one-bank detectors. All of these new detectors are developed based on Li:ZnS scintillators and WLS fibers. Recently, we developed a detector with a detection area four times larger than the original one (2 2 size, 512 512 mm). Based on these results, work is now underway to further expand the detector area with rectangular shape of 1 3 (256 768 mm) and 2 3 (512 768 mm). The design and experimental results of the prototype detectors will be presented.