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Nakamura, Tatsuya; To, Kentaro; Koizumi, Tomokatsu; Kiyanagi, Ryoji; Ohara, Takashi; Ebine, Masumi; Sakasai, Kaoru
Proceedings of 2022 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room Temperature Semiconductor Detector Conference (2022 IEEE NSS MIC RTSD) (Internet), 2 Pages, 2022/11
A new thin position-sensitive scintillation neutron detectors have been developed to replace present scintillation detectors in SENJU diffractometer at J-PARC MLF. The SENJU diffractometer originally composed of 37 position-sensitive detectors, where each detector has neutron sensitive area of 256 
256 mm with a pixel size of 4 4 mm. To renew some original detectors the new detectors have been developed based on ZnS scintillator and wavelength-shifting fibers technology. The developed replacement detectors were designed with a thin thickness of 12 cm, which is 40% of the original detector. The new detectors have also improved detector performances to the original ones in terms of detection efficiency (
60% for 2-A neutrons) and count uniformity (5-8%). The produced six detector modules have been implemented to the beamline after checking their detector performances in the lab.
Nakamura, Tatsuya; To, Kentaro; Koizumi, Tomokatsu; Kiyanagi, Ryoji; Ohara, Takashi; Ebine, Masumi; Sakasai, Kaoru
Proceedings of 2020 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2020), Vol.1, p.483 - 484, 2021/09
Two-dimensional neutron detectors were developed for the extension of SENJU time-of-flight Laue single crystal neutron diffractometer in J-PARC MLF. The detectors are to be installed at the additional detector bank for the SENJU instrument. The detector module is made based on ZnS scintillator and wavelength-shifting fiber technology, where each detector module maintains a neutron-sensitive area of 256256 mm with a pixel size of 44 mm. To meet the tight space limitation in the instrument, the detector was designed as compact as possible. The detector has a depth of 170 mm, which is about 40% smaller than that of the original SENJU detector. All four produced detectors exhibited similar detector performances: detection efficiency 50-60% for 2-
neutron, 
Co gamma-ray sensitivity 110
, count uniformity 3-6%.
Nakamura, Tatsuya; To, Kentaro; Kawasaki, Takuro; Kiyanagi, Ryoji; Ohara, Takashi; Koizumi, Tomokatsu; Ebine, Masumi; Sakasai, Kaoru
no journal, ,
Position-sensitive scintillation neutron detectors developed using wavelength-shifting (WLS) fiber read out in the Materials and Life Science Experimental Facility of the Japanese Proton Accelerator Research Complex (J-PARC MLF) are briefly reviewed. Several tens of two-dimensional scintillator / WLS fiber detectors have been developed for the single crystal diffractometers. They are implemented to the beam lines of BL03 and BL18. The scintillator / WLS fiber read out technology has many advantages over conventional clear fiber coupled detectors, such as its simple detector structure, flexibility to a pixel size design, and manufacturing cost. In this paper, several examples of the WLS fiber detectors developed at J-PARC MLF are presented together with a recent detector development for the additional detector bank of the BL18. Moreover, a possibility to produce a larger area detector with this technology will be discussed.
