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Journal Articles

Development of position-sensitive scintillation neutron detectors at J-PARC/MLF

Nakamura, Tatsuya; To, Kentaro; Sakasai, Kaoru; Honda, Katsunori; Soyama, Kazuhiko; Katagiri, Masaki*

JAEA-Conf 2015-002, p.391 - 398, 2016/02

Development of position-sensitive scintillator detectors at the J-PARC/MLF is briefly reviewed. The detector development for the neutron scattering instruments in the J-PARC/MLF initiated back in 2001. After the basic experiments and design study we have produced first beam line detectors in 2008 both with the one and two-dimensional position-sensitivity. With an extension of the fiber detector technology the detector that has an active area of 256 $$times$$ 256 mm$$^{2}$$ with a 4-mm spatial resolution was designed and made for the single crystal diffractometer, SENJU, in 2011. In the presentation recent development work including the alternative detectors to $$^{3}$$He gas is also introduced as well as the new detector development for the nextiBIX instrument.

Journal Articles

An Empirical formula for calculating the spatial resolution of a wavelength-shifting fibre detector coupled with a ZnS/$$^{6}$$LiF scintillator for detecting thermal neutrons

Nakamura, Tatsuya; To, Kentaro; Honda, Katsunori; Sakasai, Kaoru; Soyama, Kazuhiko; Katagiri, Masaki*

Journal of Instrumentation (Internet), 9(11), p.C11020_1 - C11020_7, 2014/11

 Times Cited Count:0 Percentile:0.01(Instruments & Instrumentation)

An empirical formula that predicts a spatial resolution of a thermal neutron detector comprising wavelength-shifting (WLS) fibre arrays coupled with a ZnS/$$^{6}$$LiF scintillator screen was derived based on the experimental results. The spatial resolutions of the test detectors were measured separately to evaluate the contributions due to light spread within the part of the scintillator and the part of the WLS fibres layres. The calculated results by using the derived formula reproduced the results with the test detectors, demonstrating the feasibility of the formula for designing a neutron-detecting head of this type detector.

Journal Articles

Development of a wavelength-shifting-fibre-based scintillator neutron detector as an alternative to $$^{3}$$He at J-PARC/MLF

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

Journal of Physics; Conference Series, 528, p.012042_1 - 012042_7, 2014/07

 Times Cited Count:3 Percentile:80.06

A wavelength-shifting fiber based scintillator detector has been developed as a helium-3 alternative detector in J-PARC/MLF. The detector is aimed at using for an inelastic neutron scattering instrument in a pulsed neutron source. The detector should have a capability to have a large-area coverage with a moderate pixel size as well as high detector efficiency, low $$gamma$$ sensitivity, and a low background rate. We have developed a detector that has a larger neutron-sensitive area with a moderate pixel size based on the detector implemented in the SENJU instrument in the J-PARC/MLF. The prototype detector has a pixel size of 20 $$times$$ 20 mm with a neutron-sensitive area of 320 $$times$$ 320 mm. In the presentation detailed detector performances are presented in comparison to those measured by an original SENJU detector.

Journal Articles

Development of a ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ scintillator with low-afterglow phosphor

Nakamura, Tatsuya; Katagiri, Masaki*; Tsutsui, Noriaki*; To, Kentaro; Rhodes, N. J.*; Schooneveld, E. M.*; Oguri, Hirofumi*; Noguchi, Yasunobu*; Sakasai, Kaoru; Soyama, Kazuhiko

Journal of Physics; Conference Series, 528, p.012043_1 - 012043_8, 2014/07

 Times Cited Count:3 Percentile:80.06

We have developed a ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ scintillator that has a high light output with less afterglow for neutron scattering instruments in the J-PARC/MLF. A commercial ZnS/$$^{6}$$LiF scintillator has widely been used for thermal neutron detection and its superior light output with low $$gamma$$ sensitivity has been proven. However its large afterglow followed with a primary emission light gives a limit on a detector count rate. A detector in the J-PARC/MLF should have a capability to cope with higher count rate than ever since the source flux is increasing up to 1 MW (300 kW at present). To address such problem we have developed the ZnS phosphor that exhibited a low after glow. We have also made a neutron-sensitive scintillator in combination with a $$^{10}$$B$$_{2}$$O$$_{3}$$ by sintering method in search of high detector efficiency. The scintillator properties and the detector performances will be shown in the presentation.

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:6 Percentile:45.67(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:13 Percentile:73.05(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:18 Percentile:82.58(Instruments & Instrumentation)

Journal Articles

A Time-of-flight neutron imaging detector using ZnS/$$^{6}$$LiF scintillator and wavelength shifting fibers with high spatial resolution and with low gamma-ray sensitivity

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

Proceedings of 2014 IEEE Nuclear Science Symposium and Medical Imaging Conference; 21st International Symposium on Room-Temperature Semiconductor X-ray and $$gamma$$-ray detectors (NSS/MIC 2014), p.1751 - 1753, 2014/00

The ZnS scintillator-based two-dimensional detector was developed for a time-of-flight neutron imaging with a high spatial resolution and a low $$gamma$$-ray sensitivity. The detector is comprised of a thin ZnS scintillator with crossed wavelength-shifting-fibers (WLS fibers) arrays equipped with the fiber optic taper (FOT). The developed detector based on a neutron counting method has a high spatial resolution of less than 100 um (in FWHM) with a moderate count rate capability of several tens of thousands of cps. Of particular interest is its low $$gamma$$-ray sensitivity of 10$$^{-7}$$. Imaging capabilities of the detector are demonstrated by using a high-intensity pulsed neutron beam at the Materials and Life Science Experimental Facility in the Japan Proton Accelerator Complex (J-PARC/MLF).

Journal Articles

Evaluation of performance for IBARAKI biological crystal diffractometer iBIX with new detectors

Kusaka, Katsuhiro*; Hosoya, Takaaki*; Yamada, Taro*; Tomoyori, Katsuaki; Ohara, Takashi; Katagiri, Masaki*; Kurihara, Kazuo; Tanaka, Ichiro*; Niimura, Nobuo*

Journal of Synchrotron Radiation, 20(6), p.994 - 998, 2013/11

 Times Cited Count:34 Percentile:85.5(Instruments & Instrumentation)

The IBARAKI biological crystal diffractometer, iBIX, is a high-performance time-of-flight neutron single-crystal diffractometer for elucidating mainly the hydrogen, protonation and hydration structures of biological macromolecules in various life processes. Since the end of 2008, iBIX has been available to user's experiments supported by Ibaraki University. Since August 2012, an upgrade of the 14-existing detectors has begun and 16 new detectors have been installed for iBIX. The total measurement efficiency of the present diffractometer has been impoved by one order of magnitude from the previous one with the increasing of accelerator power. In December 2012, commissioning of the new detectors was successful, and collection of the diffraction dataset of ribonucrease A as a standard protein was attempted in order to estimate the performance of the upgraded iBIX in comparison with previous results. The resolution of diffraction data, equivalence among intensities of symmetry-related reflections and reliability of the refined structure have been improved dramatically. iBIX is expected to be one of the highest-performance neutron single-crystal diffractometers for biological macromolecules in the world.

Journal Articles

A Line pair indicator made of Gd film for evaluating spatial resolution

Yasuda, Ryo; Matsubayashi, Masahito; Sakai, Takuro; Nojima, Takehiro; Iikura, Hiroshi; Katagiri, Masaki*; Takano, Katsuyoshi*; Pikuz, T.; Faenov, A.*

Physics Procedia, 43, p.196 - 204, 2013/00

 Times Cited Count:1 Percentile:54.4

Journal Articles

Development of an imaging system for the observation of water behavior in a channel in PEFC

Nojima, Takehiro; Yasuda, Ryo; Takenaka, Nobuyuki*; Katagiri, Masaki*; Iikura, Hiroshi; Sakai, Takuro; Matsubayashi, Masahito

Physics Procedia, 43, p.282 - 287, 2013/00

 Times Cited Count:2 Percentile:70.26

We developed a new imaging system for observing the water distribution in Polymer Electrolyte Fuel Cell (PEFC) under operation. This imaging system realizes both low noise and high sensitivity imaging and it enables to obtain an image in relatively short exposure time. This imaging system consists of EM-CCD (Electron Multiplication-Charged Coupled Device) camera, a LiF/ZnS scintillator screen and slit system. The EM-CCD camera has wide dynamic range and high sensitivity. The brightness of the scintillator screen is about three times higher than that of conventional type. The slit system was used for reducing the white dot noise caused by primary and/or secondary prompt $$gamma$$ rays. A characteristic test of this imaging system using JARI (Japan Automobile Research Institute)-standard cell was carried out at TNRF. In the results of the test, qualitative and quantitative observation of water behavior in the channel of PEFC was archived by the new imaging system.

Journal Articles

Evaluation of angular dependence of neutron detection efficiencies of ZnS scintillator detectors

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

Proceedings of 2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC), Vol.4, p.2367 - 2369, 2013/00

The detection efficiency of a ZnS-based neutron scintillator detector was evaluated as a function of the incident angle and the wavelength of a neutron. A pulsed neutron beam that has a wavelength from 1 to 8${AA}$ was incident to the test detector that implemented a ZnS/$$^{6}$$LiF and ZnS/$$^{10}$$B$$_{2}$$O$$_{3}$$ scintillator that have thicknesses of 0.45 and of 0.20 mm, respectively. In each scintillator the detection efficiency increased as the incident angle increased for neutrons with a wavelength shorter than about 3${AA}$. A comparison between the experimental results and the model fitting are presented.

Journal Articles

A Large-area two-dimensional scintillator detector with a wavelength-shifting fibre readout for a time-of-flight single-crystal neutron diffractometer

Nakamura, Tatsuya; Kawasaki, Takuro; Hosoya, Takaaki*; To, Kentaro; Oikawa, Kenichi; Sakasai, Kaoru; Ebine, Masumi; Birumachi, Atsushi; Soyama, Kazuhiko; Katagiri, Masaki*

Nuclear Instruments and Methods in Physics Research A, 686, p.64 - 70, 2012/09

 Times Cited Count:30 Percentile:90.96(Instruments & Instrumentation)

A two-dimensional scintillator-based neutron detector that has a neutron-sensitive area of 256 $$times$$ 256 mm$$^{2}$$ with a pixel size of 4 mm was developed. The detector was designed to be compact and modular with the smallest dead area for the SENJU time-of-flight Laue single-crystal diffractometer to be constructed in the Materials and Life Experimental Science Facility at the Japanese Proton Accelerator Research Complex. Two ZnS/$$^{10}{B}_{2}{O}_{3} $$ scintillator screens with an optimized scintillator thickness sandwiched the cross-arranged Wavelength-shifting fibre arrays to ensure a high detection efficiency for thermal neutrons. The prototype detector exhibited a detector efficiency of 40 $$pm$$ 1 % for 1.6-${AA}$ neutrons and a $$^{60}$$Co $$gamma$$-ray sensitivity of 6.0$$pm$$0.1 $$ times$$ $${10}^{-6}$$, which fulfilled the required detector specifications for SENJU.

Journal Articles

Influence of powder particle size and scintillator layer thickness on the performance of Gd$$_{2}$$O$$_{2}$$S:Tb scintillators for neutron imaging

Yasuda, Ryo; Katagiri, Masaki*; Matsubayashi, Masahito

Nuclear Instruments and Methods in Physics Research A, 680, p.139 - 144, 2012/07

 Times Cited Count:16 Percentile:75.43(Instruments & Instrumentation)

Journal Articles

Evaluations of the new LiF-scintillator and optional brightness enhancement films for neutron imaging

Iikura, Hiroshi; Tsutsui, Noriaki*; Nakamura, Tatsuya; Katagiri, Masaki*; Kureta, Masatoshi; Kubo, Jun*; Matsubayashi, Masahito

Nuclear Instruments and Methods in Physics Research A, 651(1), p.100 - 104, 2011/09

 Times Cited Count:8 Percentile:55.28(Instruments & Instrumentation)

Japan Atomic Energy Agency has developed the neutron scintillator jointly with Chichibu Fuji Co., Ltd. In this study, we evaluated the new ZnS(Ag):Al/$$^{6}$$LiF scintillator developed for neutron imaging. It was confirmed that the brightness increased by about double while maintaining equal performance for the spatial resolution as compared with a conventional scintillator. High frame-rate imaging using a high-speed video camera system and this new scintillator made it possible to image beyond 10000 frames per second while still having enough brightness. This technique allowed us to obtain a high-frame-rate visualization of oil flow in a running car engine. Furthermore, we devised a technique to increase the light intensity of reception for a camera by adding brightness enhancement films on the output surface of the scintillator. It was confirmed that the spatial resolution degraded more than double, but the brightness increased by about three times.

Journal Articles

Evaluation of water distribution in a small-sized PEFC by neutron radiography

Yasuda, Ryo; Shiozawa, Masahiro*; Katagiri, Masaki*; Takenaka, Nobuyuki*; Sakai, Takuro; Hayashida, Hirotoshi; Matsubayashi, Masahito

Denki Kagaku Oyobi Kogyo Butsuri Kagaku, 79(8), p.614 - 619, 2011/08

 Times Cited Count:1 Percentile:2.61(Electrochemistry)

Journal Articles

Online Thomson parabola spectrometer for tens of Mev laser-driven ion acceleration

Sakaki, Hironao; Kanasaki, Masato; Hori, Toshihiko*; Fukuda, Yuji; Yogo, Akifumi; Nishiuchi, Mamiko; Katagiri, Masaki*; Niita, Koji*

Proceedings of 8th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.667 - 669, 2011/08

In JAEA, we develop the small size high energy particle source that based on the laser-driven ion accelerator. Laser-driven acceleration systems have generated beams with energies up to tens-MeV ions1) from laser-plasma interaction. These ions are combined with X-ray and high energy electrons. The diagnostic most using for these ion beams is the Thomson parabola with CR-39 detector that has a characteristic of an effective way for ions detection under these conditions. However, CR-39 is necessary the etching process, and cannot obtain Thomson parabola's data online. So we challenge the development of an online Thomson parabola spectrometor with CCD camera and fluorescence film.

Journal Articles

Development of wavelength-shifting-fiber neutron image detector with a fiber-optic taper with a high spatial resolution

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

Proceedings of 2011 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2011), Vol.1, p.382 - 384, 2011/00

The neutron image detector that was based on wavelength-shifting-fibers (WLS fibres) equipped with the fibre optic taper (FOT) was developed. By inserting the FOT in between the scintillator and WLS fibers the measured neutron image was magnified on the WLS fibres, resulting in better spatial resolution. We have tested two FOTs; a square shaped one in a size of 2.6 $$times$$ 2.6 mm and a round shaped with a diameter of 20 mm. Both FOTs have identical magnification ratios of 3.1. By implementing the larger FOT the detector has the neutron-sensitive area of 314 mm$$^{2}$$ with the effective pixel size of 0.17 $$times$$ 0.17 mm$$^{2}$$ whilst the light transmission rate decreased 20% less compared to that with the small FOT. The detector equipped with the larger FOT exhibited a spatial resolution of 0.26 $$pm$$ 0.07 mm, which was similar to the one with the small FOT.

Journal Articles

Prompt in-line diagnosis of single bunch transverse profiles and energy spectra for laser-accelerated ions

Sakaki, Hironao; Nishiuchi, Mamiko; Hori, Toshihiko; Bolton, P.; Yogo, Akifumi; Katagiri, Masaki*; Ogura, Koichi; Sagisaka, Akito; Pirozhkov, A. S.; Orimo, Satoshi; et al.

Applied Physics Express, 3(12), p.126401_1 - 126401_3, 2010/11

 Times Cited Count:8 Percentile:35.3(Physics, Applied)

Many applications of laser-accelerated ions will require beamlines with diagnostic capability for validating simulations and machine performance at the single bunch level as well as for the development of controls to optimize machine performance. We demonstrated prompt, in-line, single bunch transverse profile and energy spectrum detection using a thin luminescent diagnostic and scintillator-based time-of-flight spectrometer simultaneously. The Monte Carlo code, particle and heavy ion transport code systems (PHITS) simulation is shown to be reasonably predictive at low proton energy for the observed transverse profiles measured by the thin luminescent monitor and also for single bunch energy spectra measured by time-of-flight spectrometry.

Journal Articles

Development and installation of neutron detectors for engineering materials diffractometer at J-PARC

Sakasai, Kaoru; To, Kentaro; Nakamura, Tatsuya; Harjo, S.; Moriai, Atsushi; Ito, Takayoshi; Abe, Jun; Aizawa, Kazuya; Soyama, Kazuhiko; Katagiri, Masaki*; et al.

Proceedings of 19th Meeting of the International Collaboration on Advanced Neutron Sources (ICANS-19) (CD-ROM), 5 Pages, 2010/07

Neutron detectors for Engineering Materials Diffractometer, named TAKUMI, at J-PARC have been developed under international cooperation between Rutherford Appleton Laboratory (RAL) and Japan Atomic Energy Agency (JAEA), and installed successfully at the end of March 2009. The detector size was 805$$times$$1370$$times$$217 mm which was about 1.5 times larger than those installed in ENGIN-X, ISIS facility, RAL. Neutrons are detected based on a nuclear reaction of $$^{6}$$Li(n, $$alpha$$)$$^{3}$$H using ZnS/$$^{6}$$LiF scintillator. The data acquisition electronics and decoding module were also manufactured. The overall performances of the detectors have been tested using various sources. The results showed that the detectors had good performances such as a position resolution of 3 mm, a neutron detection efficiency of more than 50% at 1 ${AA}$-neutrons, and a $$gamma$$-ray sensitivity of less than 10$$^{-6}$$ at 1.3 MeV-$$gamma$$-ray by $$^{60}$$Co source, which met the requirements of TAKUMI, and they will be presented at the meeting.

202 (Records 1-20 displayed on this page)