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Journal Articles

Neutron-sensitive ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ ceramic scintillator detector as an alternative to a $$^{3}$$He-gas-based detector for a plutonium canister assay system

Nakamura, Tatsuya; Ozu, Akira; To, Kentaro; Sakasai, Kaoru; Suzuki, Hiroyuki; Honda, Katsunori; Birumachi, Atsushi; Ebine, Masumi; Yamagishi, Hideshi*; Takase, Misao; et al.

Nuclear Instruments and Methods in Physics Research A, 763, p.340 - 346, 2014/05

 Times Cited Count:2 Percentile:77.01(Instruments & Instrumentation)

A neutron-sensitive ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ ceramic scintillator detector was developed as an alternative to a $$^{3}$$He-gas-based detector for use in a plutonium canister assay system. The detector has a modular structure, with a flat ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ceramic scintillator strip that is installed diagonally inside a light-reflecting aluminium case with a square cross section. The prototype detectors, which have a neutron-sensitive area of 30 mm $$times$$ 250 mm, exhibited a sensitivity of 21.7-23.4 $$pm$$ 0.1 cps$$/$$nv for thermal neutrons, a $$^{137}$$Cs $$gamma$$-ray sensitivity of 1.1-1.9 $$pm $$0.2 $$times$$ 10$$^{-7}$$ and a count variation of less than 6% over the detector length. A trial experiment revealed a temperature coefficient of less than -0.24$$pm$$ 0.05% / $$^{circ}$$C over the temperature range of 20-50$$^{circ}$$C.

Journal Articles

A Position-sensitive tubular scintillator-based detector as an alternative to a $$^{3}$$He-gas-based detector for neutron-scattering instruments

Nakamura, Tatsuya; Katagiri, Masaki*; To, Kentaro; Honda, Katsunori; Suzuki, Hiroyuki; Ebine, Masumi; Birumachi, Atsushi; Sakasai, Kaoru; Soyama, Kazuhiko

Nuclear Instruments and Methods in Physics Research A, 741, p.42 - 46, 2014/03

 Times Cited Count:5 Percentile:52.58(Instruments & Instrumentation)

A position-sensitive tubular scintillator-based neutron detector is proposed as an alternative to a $$^{3}$$He-gas-based detector. The detector has a neutron-detecting element constructed from rolled ZnS/$$^{6}$$LiF scintillator screens that sandwich wavelength-shifting (WLS) fibre coils (SFC element). Multiple SFC elements are enclosed in an aluminium tube in a row to form a one-dimensional position-sensitive neutron detector. The design of the WLS fibre coil, which was determined by performing basic experiments, comprised two 0.75-mm-diameter WLS fibres wound in parallel at a pitch of 1.5 mm. A 64-element detector with a pixel size of 22 mm $$times$$ 20 mm (width $$times$$ length) successfully demonstrated the detection principle. The tubular shape of the new detector is similar to the usual 25-mm-diameter $$^{3}$$He tube, making this an alternative detector with the potential to be installed in a vacuum tank for inelastic-neutron-scattering instruments.

Journal Articles

A Scintillator-based detector with sub-100-$$mu$$m spatial resolution comprising a fibre-optic taper with wavelength-shifting fibre readout for time-of-flight neutron imaging

Nakamura, Tatsuya; To, Kentaro; Kawasaki, Takuro; Honda, Katsunori; Suzuki, Hiroyuki; Ebine, Masumi; Birumachi, Atsushi; Sakasai, Kaoru; Soyama, Kazuhiko; Katagiri, Masaki*

Nuclear Instruments and Methods in Physics Research A, 737, p.176 - 183, 2014/02

 Times Cited Count:10 Percentile:31.21(Instruments & Instrumentation)

Journal Articles

Detector system of the $$SENJU$$ single-crystal time-of-flight neutron diffractometer at J-PARC/MLF

Kawasaki, Takuro; Nakamura, Tatsuya; To, Kentaro; Hosoya, Takaaki*; Oikawa, Kenichi; Ohara, Takashi; Kiyanagi, Ryoji; Ebine, Masumi; Birumachi, Atsushi; Sakasai, Kaoru; et al.

Nuclear Instruments and Methods in Physics Research A, 735, p.444 - 451, 2014/01

 Times Cited Count:15 Percentile:17.29(Instruments & Instrumentation)

Journal Articles

Wavelength-shifting-fibre-based neutron image detector with a fibre-optic taper to increase the spatial resolution

Nakamura, Tatsuya; Katagiri, Masaki; To, Kentaro; Sakasai, Kaoru; Ebine, Masumi; Birumachi, Atsushi; Soyama, Kazuhiko

Nuclear Instruments and Methods in Physics Research A, 604(1-2), p.158 - 160, 2009/06

 Times Cited Count:6 Percentile:53.78(Instruments & Instrumentation)

The effective pixel size of a two-dimensional wavelength-shifting-fibre (WLS-fibre)-based neutron image detector was improved from 0.5 to 0.16 mm by including a fibre-optic taper (FOT) between the scintillator screen and the WLS fibre. The WLS-fibre-based detector consisted of a thin ZnS/$$^{6}$$LiF screen, a FOT and WLS ribbons crossed in the x and y directions. The demonstrator detector had 16 fibre channels in each direction, and the light signals in each fibre were read out individually. The FOT was constructed from fine glass fibres with a taper ratio of 3.1, and served as an image magnifier. The prototype detector equipped with the FOT exhibited a spatial resolution of 0.3 mm, compared to the spatial resolution of 0.8 mm for the original detector without the FOT.

JAEA Reports

Development for upgrading Japanese ENGIN-X type linear scintillation neutron detectors; Development of new ZnS scintillator, light reflector and digital signal processing module

Nakamura, Tatsuya; Katagiri, Masaki; Birumachi, Atsushi; Ebine, Masumi; Tsutsui, Noriaki*; Soyama, Kazuhiko; Schooneveld, E. M.*; Rhodes, N. J.*

JAEA-Research 2008-116, 26 Pages, 2009/03

JAEA-Research-2008-116.pdf:4.25MB

New ZnS scintillator, light reflector and digital signal processing modules were developed to upgrade the Japanese ENGIN-X type linear scintillation neutron detector. The developed ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ scintillator improved detector efficiency by a factor 1.2 for neutrons with a wavelength of 1 ${AA}$ whilst the detector maintained similar $$gamma$$ sensitivity and multi-count ratio compared to the present AST (4:1) scintillator. The paint coating less light reflector was developed with an aluminum reflector with etched surface. The detector implemented with this reflector exhibited similar detector performances with paint coating reflectors, confirming feasibility of the reflector with long-term stability. The digital signal-processing module incorporating photon-counting method was successfully developed. The fully digitalized photon counting system improved a temperature stability of neutron counts significantly comparing to the present analogue system.

JAEA Reports

Development of two-dimensional scintillator neutron detector using wavelength-shifting fibres; Development of a compact detector for iBIX instrument in J-PARC/MLF

Nakamura, Tatsuya; Katagiri, Masaki; Hosoya, Takaaki*; Birumachi, Atsushi; Ebine, Masumi; Soyama, Kazuhiko; Schooneveld, E.*; Rhodes, N.*

JAEA-Research 2008-115, 33 Pages, 2009/03

JAEA-Research-2008-115.pdf:3.77MB

A compact two-dimensional neutron detector was developed for iBIX instrument in the J-PARC/MLF. The specifications required for the detector were a spatial resolution of less than 1 mm, a detector efficiency of more than 50% for thermal neutrons, a $$gamma$$ sensitivity of less than 10$$^{6}$$, detector coverage of around 15$$times$$15 cm$$^{2}$$ with least dead area, compactness, modularity, and a pulse pair resolution of less than 2 $$mu$$s. The detector components were studied in detail and optimized for the purpose. The compact prototype detector that has a neutron sensitive area of 13.3$$times$$13.3 cm$$^{2}$$ was made and feasibility of the detector was demonstrated successfully in the experiments at the ISIS pulsed neutron source.

Journal Articles

Signal processing system based on FPGAs for neutron imaging detectors using scintillators

Ebine, Masumi; Katagiri, Masaki; Birumachi, Atsushi; Matsubayashi, Masahito; Sakasai, Kaoru; Sato, Setsuo*

Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.429 - 432, 2004/08

 Times Cited Count:1 Percentile:89.17(Instruments & Instrumentation)

no abstracts in English

Journal Articles

A Compact neutron detector using scintillators with wavelength shifting fibers by backside readout method

Katagiri, Masaki; Matsubayashi, Masahito; Sakasai, Kaoru; Nakamura, Tatsuya; Ebine, Masumi; Birumachi, Atsushi; Rhodes, N.*

Nuclear Instruments and Methods in Physics Research A, 529(1-3), p.313 - 316, 2004/08

 Times Cited Count:11 Percentile:38.07(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Fabrication of a preset counter and a timing board by using FPGA

Ebine, Masumi

NIFS-MEMO-26, p.99 - 102, 1998/03

no abstracts in English

Oral presentation

Development of scintillator based neutron detectors for intense pulsed neutrons, 2; Development of digital signal processing method for ISIS-type 1D neutron detector

Ebine, Masumi; Katagiri, Masaki; Birumachi, Atsushi; Sakasai, Kaoru; Nakamura, Tatsuya; Soyama, Kazuhiko; Sato, Setsuo*; Schooneveld, E.*; Rohdes, N.*

no journal, , 

no abstracts in English

Oral presentation

Development of scintillator based neutron detectors for intense pulsed neutrons, 3; Development of high-speed amplifier and discrimination techniques for photon counting

Birumachi, Atsushi; Katagiri, Masaki; Ebine, Masumi; Nakamura, Tatsuya; Sato, Setsuo*

no journal, , 

no abstracts in English

Oral presentation

Development of scintillator based neutron detectors for intense pulsed neutrons, 6; Development of multi-function digital signal processing device for neutron image detector

Ebine, Masumi; Katagiri, Masaki; Birumachi, Atsushi; Nakamura, Tatsuya; Soyama, Kazuhiko; Sato, Setsuo*

no journal, , 

no abstracts in English

Oral presentation

Development of scintillator based neutron detectors for intense pulsed neutrons, 5; Development of multi-channel high-speed digitizing circuit

Birumachi, Atsushi; Katagiri, Masaki; Ebine, Masumi; Nakamura, Tatsuya; Soyama, Kazuhiko; Sato, Setsuo*

no journal, , 

no abstracts in English

Oral presentation

Development of scintillator based neutron detectors for intense pulsed neutrons, 10; Development of image signal processing device for neutron image detectors

Ebine, Masumi; Katagiri, Masaki; Birumachi, Atsushi; Nakamura, Tatsuya; Hosoya, Takaaki; Soyama, Kazuhiko

no journal, , 

It is dispensable to develop two-dimensional neutron imaging detectors with high position resolution, high time resolution, high counting rate, high detection efficiency, wide detection area and wide dynamic range for pulsed-neutron scattering instruments in J-PARC. Therefore, we developed an image signal-processing device that used two FPGAs with 100MHz clock for these detectors. After photon-counting signals are converted to digital signals by sampling method using the clock signal, a neutron incident position is found out by analyzing the pattern of these digital signals in the device. The incident position finding characteristics obtained by the pattern analysis method are reported.

Oral presentation

Development of scintillator based neutron detectors for instenes pulsed neutrons, 11; Development of high-counting-rate signal processing circuits for neutron beam monitor

Birumachi, Atsushi; Katagiri, Masaki; Nakamura, Tatsuya; Hosoya, Takaaki; Ebine, Masumi; Soyama, Kazuhiko

no journal, , 

It is necessary to measure always pulsed neutrons by neutron beam monitors for neutron scattering experiments in J-PARC. Especially, a high counting rate measurement is required at neutron energy range more than thermal neutrons. Therefore, neutron beam monitors using neutron scintillators were developed. For these monitors, two kinds of high-counting-rate signal processing circuits were designed and fabricated. One is a very high counting rate circuit with time constant less than 10ns and other is a high counting rate circuit with time constant of 100ns. The counting rate characteristics obtained by experimental measurements are reported.

Oral presentation

Current status of the development of a novel 2D detector system for iBIX (IBARAKI biological crystal diffractometer) in J-PARC

Katagiri, Masaki; Nakamura, Tatsuya; Ebine, Masumi; Birumachi, Atsushi; Soyama, Kazuhiko; Hosoya, Takaaki

no journal, , 

IBARAKI Biological Crystal Diffractometer "iBIX" in J-PARC/MLF is a new single-crystal pulsed-neutron diffractometor using TOF Laue method, and is used for both organic-small molecules and bio-macromolecules. The detector for iBIX requires high position and time resolution, and large sensitive area in order to cover the large scattering angle. We has developed a new 2D-scintillator detector (wavelength-shifting fiber-readout) system and TOF data acquisition system. This detector has about 70% of sensitive area (133$$times$$133 mm$$^2$$), 1 $$mu$$s of time resolution and 1 mm of position resolution (0.52 mm/pixel).

Oral presentation

Development of scintillator based neutron detectors for intense pulsed neutrons

Ebine, Masumi; Nakamura, Tatsuya; Katagiri, Masaki; Birumachi, Atsushi; Hosoya, Takaaki*; Soyama, Kazuhiko

no journal, , 

We have developed a high-position-resolution two-dimensional neutron imaging detector system used for pulsed-neutron scattering instruments in J-PARC. It is dispensable to develop a TOF signal processing and data acquisition system in this detector system. Therefore, we developed a TOF image signal-processing device with two 100 MHz FPGAs and a TOF data acquisition system with two FPGAs. Circuit design and its algorisms for TOF measurements and the fundamental performances for this system are reported.

Oral presentation

Development of scintillator based neutron detectors for intense pulsed neutrons, 16; Signal processing circuits for high S/N neutron beam monitor

Nakamura, Tatsuya; Katagiri, Masaki; Ebine, Masumi; Hosoya, Takaaki*; Soyama, Kazuhiko; Schooneveld, E.*; Rhodes, N.*

no journal, , 

We have developed pulsed neutron beam monitors with neutron scintillators composed of ZnS phosphors and neutron converters with very low neutron capture cross section. In order to develop neutron beam monitors with high S/N ratio and high counting rate characteristics, signal processing circuits with ISIS-type signal processing algorism were developed because ZnS phosphor has afterglow fluorescence and photomultipliers used for detection of fluorescence has many pulsed electric noises. Detection and signal processing characteristics as neutron beam monitors are reported.

Oral presentation

Development of signal processing and circuit technology for high-accuracy radiation and neutron measurements, 2; Novel signal processing circuit for high-accuracy imaging

Ebine, Masumi; Katagiri, Masaki*; Nakamura, Tatsuya; Birumachi, Atsushi; Hosoya, Takaaki*

no journal, , 

no abstracts in English

48 (Records 1-20 displayed on this page)