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Journal Articles

A Large area position-sensitive scintillation neutron detector for upgrading SENJU diffractometer

Nakamura, Tatsuya; To, Kentaro; Ebine, Masumi; Birumachi, Atsushi; Sakasai, Kaoru

Proceedings of 2019 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2019), Vol.1, p.735 - 736, 2020/08

 Times Cited Count:0 Percentile:0.00(Nuclear Science & Technology)

A large area, position-sensitive scintillation neutron detector was developed for upgrading the SENJU, time-of-flight Laue single crystal neutron diffractometer, in J-PARC MLF. The detector has a neutron-sensitive area of 512 $$times$$ 512 mm with a pixel size of 4 $$times$$ 4 mm. The detector was developed for upgrading of the SENJU instrument. The large area detector is to be installed below the vacuum tank to enlarge a covering solid angle. A $$^{6}$$Li:ZnS (Ag) scintillator and wavelength-shifting fiber technologies are employed. Each fiber channel is read out individually with photon counting mode. The electronics boards are implemented at the backside of the detector, enabling the detector depth as short as 20 cm. The detector exhibited a detection efficiency of 45% for thermal neutron. No degradation in fiber position and in neutron sensitivity has been observed over one year after production. In this paper, detector design and detector performances are presented.

Journal Articles

Development of a new fusion power monitor based on activation of flowing water

Verzilov, Y. M.; Nishitani, Takeo; Ochiai, Kentaro; Kutsukake, Chuzo; Abe, Yuichi

Fusion Engineering and Design, 81(8-14), p.1477 - 1483, 2006/02

 Times Cited Count:2 Percentile:16.87(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Characteristics of 64 $$times$$ 64 channel high-position resolution neutron imaging detector

Sakasai, Kaoru; Katagiri, Masaki; Matsubayashi, Masahito; Rhodes, N.*; Schoonveld, E.*

JAERI-Research 2004-020, 19 Pages, 2004/12

JAERI-Research-2004-020.pdf:4.57MB

no abstracts in English

Journal Articles

Development of a fast neutron radiography converter using wavelength-shifting fibers

Matsubayashi, Masahito; Hibiki, Takashi*; Mishima, Kaichiro*; Yoshii, Koji*; Okamoto, Koji*

Nuclear Instruments and Methods in Physics Research A, 510(3), p.325 - 333, 2003/09

 Times Cited Count:9 Percentile:52.81(Instruments & Instrumentation)

A fluorescent converter for fast neutron radiography (FNR) comprising a scintillator and hydrogen-rich resin has been developed and applied to electronic imaging. The rate of the reaction between fast neutrons and the converter is increased by thickening the converter, but its opaqueness attenuates emitted light photons before they reach its surface. To improve the luminosity of a fluorescent converter for FNR, a novel type of converter was designed in which wavelength-shifting fibers were adopted to transport radiated light to the observation end face. The performance of the converter was compared with that of a polypropylene-based fluorescent converter in an experiment conducted at the fast-neutron-source reactor YAYOI in the University of Tokyo.

Journal Articles

Two-dimensional neutron imaging method using scintillators with wavelength shifting fibers

To, Kentaro; Katagiri, Masaki; Sakasai, Kaoru; Matsubayashi, Masahito; Birumachi, Atsushi; Takahashi, Hiroyuki*; Nakazawa, Masaharu*

Nuclear Instruments and Methods in Physics Research A, 485(3), p.571 - 575, 2002/09

 Times Cited Count:2 Percentile:18.80(Instruments & Instrumentation)

no abstracts in English

Oral presentation

Detector upgrade for SENJU neutron diffractometer at J-PARC MLF

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

no journal, , 

New detector modules have been developed based on a $$^{6}$$Li:ZnS scintillator and wavelength-shifting fibers technology to upgrade the detectors for SENJU neuron diffractometer at J-PARC MLF. The detector upgrade plan includes (1) Thin-type add-in detectors, (2) High efficiency detectors to replace the original ones, (3) a large area detector for installation under the sample vacuum tank (Large area bottom detector), and (4) One detector-bank detectors. As for (1) and (2) the detector modules have been developed with a 1.5-fold improved detection efficiency with a 50-60% smaller detector depth. 4 add-in detectors and 6 replacement detectors have been manufactured and installed to the diffractometer. The large area bottom detector that has a four-fold larger neutron-sensitive area than the original detector, has also been developed. To increase the light collection efficiency a scintillation light is collected from the both ends of the wavelength-shifting fiber. The prototype detector exhibited an acceptable count uniformity 5$$sim$$9% over the detector.

Oral presentation

A Two-dimensional scintillation neutron detector module for a new protein single crystal neutron diffractometer at J-PARC MLF

Nakamura, Tatsuya; To, Kentaro; Tsutsui, Noriaki; Ebine, Masumi; Birumachi, Atsushi

no journal, , 

A position-sensitive scintillation detector module for a new protein neutron diffractometer was developed by using a scintillator / wavelength shifting (WLS) fiber technology. The detector module has a spatial resolution of 2.5 mm with a neutron-sensitive area of 320 $$times$$ 320 mm$$^{2}$$. The WLS fibers are arranged in a regular pitch of 2.5 mm in x and y direction and those arrays are placed diagonally. The light reflecting grid is inserted in between the fibers in order for optical isolation and for mechanical support of the fiber. The detector implemented flat $$^{6}$$Li/ZnS screens up and downstream of the WLF fiber arrays. The detector exhibited a detection efficiency of 30-50% for thermal neutron (depending on $$gamma$$-ray sensitivities) and a count uniformity of ~13%. In this paper detailed detector design and experimental results obtained using a pulsed neutron beam are presented.

Oral presentation

Development of position-sensitive scintillation neutron detector using wavelength shifting fiber at J-PARC MLF

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.

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