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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:51.32(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:9 Percentile:33.97(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:14 Percentile:18.24(Instruments & Instrumentation)

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:26 Percentile:16.39(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:41.05

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:24.98

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

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:9 Percentile:34.41(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:7 Percentile:43.84(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:96.91(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

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:61.62(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

A Half-millimetre spatial resolution fibre-coded linear position-sensitive scintillator detector with wavelength-shifting fibre read-out for neutron detection

Nakamura, Tatsuya; Schooneveld, E. M.*; Rhodes, N. J.*; Katagiri, Masaki; To, Kentaro; Sakasai, Kaoru; Soyama, Kazuhiko

Nuclear Instruments and Methods in Physics Research A, 606(3), p.675 - 680, 2009/07

 Times Cited Count:9 Percentile:45.11(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:53.5(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

Aalpha-ray detection with a MgB$$_{2}$$ transition edge sensor

Okayasu, Satoru; Katagiri, Masaki; Hojo, Kiichi; Morii, Yukio; Miki, Shigenobu*; Shimakage, Hisashi*; Wang, Z.*; Ishida, Takekazu*

Physica C, 468(15-20), p.1998 - 2000, 2008/09

 Times Cited Count:0 Percentile:100(Physics, Applied)

We have been investigating for neutron detection with the MgB $$_{2}$$ transition edge sensor (TES). For the purpose, we have been developing a low noise measurement system for neutron detection. To confirm the usefulness of our detecting system, alpha-ray detection from an $$^{241}$$Am source was achieved. To improve the sensitivity, short meander samples with 35 $$mu$$m length and 1 $$mu$$m width is used. Samples are fabricated by the Kansai group. Superconducting transition temperature Tc is 23.3 K. The transition width is sharp enough less than 1 K. The detection was achieved under a constant current condition, and the resistivity changes at the sample due to the alpha-ray irradiation were detected. The bias current is 6 $$mu$$A.

Journal Articles

Superconducting MgB$$_2$$ thin film detector for neutrons

Ishida, Takekazu*; Nishikawa, Masatoshi*; Fujita, Yoshifumi*; Okayasu, Satoru; Katagiri, Masaki*; Sato, Kazuo*; Yotsuya, Tsutomu*; Shimakage, Hisashi*; Miki, Shigehito*; Wang, Z.*; et al.

Journal of Low Temperature Physics, 151(3-4), p.1074 - 1079, 2008/05

 Times Cited Count:32 Percentile:21.41(Physics, Applied)

The superconducting neutron detector using high-quality $$^{10}$$B-enriched MgB$$_2$$ thin films at higher operating temperatures has been proposed, where a resistance change induced by the nuclear reaction of neutron and $$^{10}$$B in MgB$$_2$$ is used to detect a neutron. Cold neutrons from a nuclear research reactor irradiated the MgB$$_2$$ detector, and the output voltage was clearly observed through a low-noise amplifier by using a digital oscilloscope. The out-of-equilibrium thermodynamics was investigated by means of the time-dependent Ginzburg-Landau equations by using the Earth Simulator.

JAEA Reports

Performance test of the Japanese ENGIN-X type linear scintillation neutron detector

Nakamura, Tatsuya; Sakasai, Kaoru; Katagiri, Masaki; Birumachi, Atsushi; Hosoya, Takaaki; Soyama, Kazuhiko; Sato, Setsuo*; Shooneveld, E.*; Rhodes, N.*

JAEA-Research 2007-014, 14 Pages, 2007/03

JAEA-Research-2007-014.pdf:1.9MB

The ENGIN-X type linear scintillation neutron detector was manufactured in Japan and the detector performances were evaluated. The ENGIN-X type linear scintillation neutron detector was originally developed by the detector group in Rutherford Appleton Laboratory and the Japanese prototype detector was identical to that which is one of the detector modules installed in the ENGIN-X diffractometer at ISIS pulsed neutron source. The prototype detector can install 240 elements of neutron-sensitive scintillator, where each element has 3 mm in width and 196 mm in length. The prototype detector exhibited a spatial resolution of 3 mm, detection efficiency of 64% for neutrons with wave-lengths of 1.8${AA}$, count uniformity of 6$$sim$$7%, $$^{60}$$Co $$gamma$$ sensitivity of $$sim$$5$$times$$10$$^{-7}$$. Technological transfer to the Japanese manufacturer was done successfully and the mass production of these detectors for the J-PARC project is feasible.

Journal Articles

InSb cryogenic radiation detectors

Kanno, Ikuo*; Hishiki, Shigeomi*; Sugiura, Osamu*; Xiang, R.*; Nakamura, Tatsuya; Katagiri, Masaki

Nuclear Instruments and Methods in Physics Research A, 568(1), p.416 - 420, 2006/11

 Times Cited Count:13 Percentile:29.61(Instruments & Instrumentation)

no abstracts in English

Journal Articles

RBPO$$_{5}$$(R=Ca, Sr)-based storage phosphors for neutron detection

Sakasai, Kaoru; Katagiri, Masaki; Matsubayashi, Masahito; Nakamura, Tatsuya; Kondo, Yasuhiro*

IEEE Transactions on Nuclear Science, 52(5), p.1856 - 1859, 2005/10

 Times Cited Count:9 Percentile:43.05(Engineering, Electrical & Electronic)

Storage characteristics of RBPO$$_{5}$$(R=Ca, Sr) based phosphors have been investigated for neutron detection. To increase the photostimulated luminescence (PSL) yields of CaBPO$$_{5}$$:Ce$$^{3+}$$ and SrBPO$$_{5}$$:Ce$$^{3+}$$ phosphors, fluorine atoms were introduced and the molar ratio of the fluorine atoms was optimized for the PSL yields. In addition, the authors found that the PSL yields of SrBPO$$_{5}$$:Eu$$^{2+}$$ phosphors were significantly increased by adding Li$$_{2}$$B$$_{4}$$O$$_{7}$$, though introducing fluorine and brome atoms in the phosphor was not effective for the PSL yields. These phosphors will be usable as new neutron storage phosphors with low $$gamma$$-ray sensitivity because they consist of light materials.

187 (Records 1-20 displayed on this page)