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Journal Articles

Development of a bump cathode element for two-dimensional neutron detection

To, Kentaro; Nakamura, Tatsuya; Sakasai, Kaoru; Yamagishi, Hideshi*

Journal of Instrumentation (Internet), 12(12), p.C12011_1 - C12011_8, 2017/12

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

A neutron-detection element using circular cathode bumps was developed for two-dimensional neutron measurement, and an irradiation experiment was performed using a $$^{252}$$Cf neutron source. The element has triangularly arranged small-sized circular cathode bumps, and the bumps are linked together in the x- and y-directions for the detection of incident neutrons. The element was arranged in the pressure vessel with a fill gas of composition He/(15%)CF$$_{4}$$ at 0.7 MPa. The detector system using bump cathode element exhibited a two-dimensional uniformity with a response of 10.1%. The average intrinsic spatial resolution was 1.89 mm full width at half maximum in the sensitive region, calculated by taking into account the track lengths of the secondary particles.

Journal Articles

Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex, 3; Neutron devices and computational and sample environments

Sakasai, Kaoru; Sato, Setsuo*; Seya, Tomohiro*; Nakamura, Tatsuya; To, Kentaro; Yamagishi, Hideshi*; Soyama, Kazuhiko; Yamazaki, Dai; Maruyama, Ryuji; Oku, Takayuki; et al.

Quantum Beam Science (Internet), 1(2), p.10_1 - 10_35, 2017/09

Neutron devices such as neutron detectors, optical devices including supermirror devices and $$^{3}$$He neutron spin filters, and choppers are successfully developed and installed at the Materials Life Science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC), Tokai, Japan. Four software components of MLF computational environment, instrument control, data acquisition, data analysis, and a database, have been developed and equipped at MLF. MLF also provides a wide variety of sample environment options including high and low temperatures, high magnetic fields, and high pressures. This paper describes the current status of neutron devices, computational and sample environments at MLF.

Journal Articles

A Ceramic-insulated ball-anode element for two-dimensional neutron detector

To, Kentaro; Nakamura, Tatsuya; Sakasai, Kaoru; Yamagishi, Hideshi*

Proceedings of 2016 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2016) (Internet), 2 Pages, 2016/00

A ceramic-insulated ball-anode (CiB) element that consists of a ceramic insulator, cathode lines, ball-shaped anodes, and anode lines was developed, and an irradiation experiment was performed using a Cf-252 neutron source. An electric field simulation of CiB element was conducted and strong electric fields of more than 10$$^{7}$$ V/m was obtained by the calculation using the finite element method. The neutron-induced signals of all pixels were observed using 8 $$times$$ 8 pixel small-sized test element under Cf-252 neutron irradiation.

Journal Articles

Development of a ceramic-insulated ball-anode element for neutron detection

To, Kentaro; Nakamura, Tatsuya; Sakasai, Kaoru; Soyama, Kazuhiko; Yamagishi, Hideshi*

Nuclear Instruments and Methods in Physics Research A, 784, p.194 - 197, 2015/06

 Times Cited Count:1 Percentile:12.03(Instruments & Instrumentation)

A novel ceramics insulated detector element was developed for neutron measurement. The developed detector element consists of a ceramics insulator, cathode lines on the insulator, and ball-shaped anodes. The incident neutrons are usually scattered by the detector element itself because it acts as scatterer. To estimate the effects of scattering, we calculated the amount of neutrons scattered by the developed element. By the calculation results by a Monte Carlo simulation using PHITS, it is found that the developed element is effective to reduce the scattered neutrons. The number of scattered neutrons of the developed element is 40% smaller than that of polymer insulated element, which is widely used in micro-pattern element. Finally, neutron-induced signals were clearly observed using the developed detector element.

Journal Articles

Two-dimensional gas-based neutron detector under high pressure gas condition

To, Kentaro; Nakamura, Tatsuya; Sakasai, Kaoru; Yamagishi, Hideshi*

Proceedings of 2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC 2015), 2 Pages, 2015/00

A two-dimensional gas-based neutron detector system that can be operated under high-pressure was developed, and an irradiation experiment was performed using a Cf-252 neutron source. The pressure vessel of the developed detector system has 256 feedthroughs insulated by alumina ceramics for neutron-induced signals and 6 connectors for high voltage. The vessel could withstand pressures of up to 0.8 MPa and with a helium leakage of less than 10$$^{-8}$$ Pam$$^{3}$$/s. The signals from neutrons clearly observed and can be discriminated from background signals such as $$gamma$$-ray and electrical noises. The flat-field image showed good homogeneity and an average gain spread of approximately 7.7%. The system exhibits a $$gamma$$-ray sensitivity of 1.1$$times$$10$$^{-7}$$.

Journal Articles

Evaluation of two-dimensional multiwire neutron detector with individual line readout under pulsed neutron irradiation

To, Kentaro; Nakamura, Tatsuya; Sakasai, Kaoru; Soyama, Kazuhiko; Yamagishi, Hideshi*

Journal of Instrumentation (Internet), 9(11), p.C11019_1 - C11019_9, 2014/11

 Times Cited Count:2 Percentile:13.22(Instruments & Instrumentation)

A multiwire-type two-dimensional neutron detector system using individual line readout and optical signal transmission method is developed for use in the Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC). The sensitive area was 128 $$times$$ 128 mm$$^{2}$$ with a pitch of 1 mm in both directions (x and y), and the 256 signal lines are individually readout by signal-processing electronics. First irradiation experiments using pulsed neutrons are performed at the J-PARC/MLF. The developed detector could determine time-of-flight spectra and time-resolved two-dimensional images accurately with time range from 0 to 40 ms that arise from 25-Hz pulsed neutrons. Finally, the validity of the detector system is confirmed by a neutron reflectometry using Ni/Ti multilayer.

Journal Articles

Performance evaluation of high-pressure MWPC with individual line readout under Cf-252 neutron irradiation

To, Kentaro; Nakamura, Tatsuya; Sakasai, Kaoru; Soyama, Kazuhiko; Yamagishi, Hideshi*

Journal of Physics; Conference Series, 528, p.012045_1 - 012045_6, 2014/07

 Times Cited Count:2 Percentile:73.96

A multiwire proportional chamber (MWPC) neutron detector system is developed for use in the Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex. In the developed MWPC system, a short response time and high spatial resolution can be obtained through the use of an individual line readout method. The developed system consists of a 256 channel detector element (x: 128 lines, y: 128 lines) equipped with a pressure vessel, amplifier-shaper-discriminator (ASD) boards, optical signal transmission devices, position encoders with field-programmable gate arrays (FPGAs), and a data acquisition device. The measured uniformity of all pixels in the two-dimensional image was 7.9%. The average intrinsic spatial resolution was 1.55 mm full width at half-maximum in the sensitive region calculated by taking into account measured track lengths of secondary particles.

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:3 Percentile:30.04(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

Development of two-dimensional multiwire-type neutron detector system with individual line readout and optical signal transmission

To, Kentaro; Nakamura, Tatsuya; Sakasai, Kaoru; Soyama, Kazuhiko; Hino, Masahiro*; Kitaguchi, Masaaki*; Yamagishi, Hideshi*

Nuclear Instruments and Methods in Physics Research A, 726, p.169 - 174, 2013/10

 Times Cited Count:7 Percentile:54.8(Instruments & Instrumentation)

A multiwire-type two-dimensional neutron detector system with a sensitive area of 128 $$times$$ 128 mm$$^{2}$$ is developed for use in the Materials and Life Science Experimental Facility at the Japan Proton Accelerator Research Complex. The system can achieve a short response time and high spatial resolution using the individual line readout method. Optical devices have been incorporated in the system for long-distance signal transmission and insulation between a detector head in the neutron shielding and signal processing circuits in the data acquisition room. The detector system exhibits a pulse-pair resolution of 1 $$mu$$s, an average spatial resolution of less than 2 mm full width at half-maximum in the sensitive region, and a two-dimensional homogeneity of 8.3% in all pixels.

JAEA Reports

A Low noise amplifier and its noise performances (Contract research)

Yamagishi, Hideshi*; To, Kentaro

JAEA-Research 2011-050, 16 Pages, 2012/10

JAEA-Research-2011-050.pdf:1.47MB

For development of two-dimensional position sensitive (2-D) neutron detectors with fast response and high spatial resolution, an ASIC with fast response and low noise performances is required. The MP8 and MP16, consisting of p-MOSFETs, with high g$$_{rm m}$$ and low noise have been proposed (1) to develop the ASIC. In this paper a simple low noise amplifier (LNA) was designed and the noise power and the noise figure were analytically calculated. The results were also applied to LNAs using MP8 or MP16 configuration. The results showed that the MP8 and MP16 had enough performances for the ASIC.

Journal Articles

Current status of a new polarized neutron reflectometer at the intense pulsed neutron source of the Materials and Life Science Experimental Facility (MLF) of J-PARC

Takeda, Masayasu; Yamazaki, Dai; Soyama, Kazuhiko; Maruyama, Ryuji; Hayashida, Hirotoshi; Asaoka, Hidehito; Yamazaki, Tatsuya; Kubota, Masato; Aizawa, Kazuya; Arai, Masatoshi; et al.

Chinese Journal of Physics, 50(2), p.161 - 170, 2012/04

JAEA Reports

A Low noise ASIC for two dimensional neutron gas detector with performance of high spatial resolution (Contract research)

Yamagishi, Hideshi*; To, Kentaro; Nakamura, Tatsuya; Sakasai, Kaoru; Soyama, Kazuhiko

JAEA-Research 2011-051, 19 Pages, 2012/02

JAEA-Research-2011-051.pdf:2.42MB

An ASD-ASIC (Amplifier-Shaper-Discriminator ASIC) with fast response and low noise performances has been designed for two-dimensional position sensitive neutron gas detectors (InSPaD). The InSPaD is a 2D neutron detector system with $$^{3}$$He gas and provides a high spatial resolution by making distinction between proton and triton particles generated in the gas chamber. The new ASD-ASIC is required to have very low noise, a wide dynamic range, good output linearity and high counting rate. The new ASD-ASIC has been designed by using CMOS and consisted of 64-channel ASDs, a 16-channel multiplexer with LVTTL drivers and sum amplifier system for summing all analog signals. The performances were evaluated by the Spice simulation. It was confirmed that the new ASD-ASIC had very low noise performance, wide dynamic range and fast signal processing functions.

JAEA Reports

Noise evaluation of a MOSFET for an ASIC (Contract research)

Yamagishi, Hideshi*; To, Kentaro

JAEA-Technology 2010-030, 16 Pages, 2010/09

JAEA-Technology-2010-030.pdf:1.38MB

In two-dimensional position sensitive (2-D) neutron detectors used for neutron scattering experiments in the J-PARC, it is required that very small pulse signals consisted of several hundred channels should be measured with discriminating form noises and $$gamma$$ ray signals and converted from analogue to digital signals in real time. To establish performances of neutron detectors such as fast response and a very small spatial resolution, multi-channel small signals should be measured and the signal processing should be carried out with high S/N ratios. For development of multi-channel electronics with fast response and very low noise, manufacture of an application specific integrated circuits (ASICs) with high performances is indispensable for the 2-D neutron detectors. Therefore, MOSFETs with high gm and low noise required for the ASIC were designed and the noise performances were studied and estimated.

JAEA Reports

Design of an Application Specific Integrated Circuits (ASIC) for two-dimensional position sensitive neutron detectors

Yamagishi, Hideshi

JAEA-Technology 2007-004, 15 Pages, 2007/02

JAEA-Technology-2007-004.pdf:1.04MB

Two-dimensional position sensitive neutron detectors that have performances of a fast response and a very small spatial resolution are required for various neutron scattering experiments using high-intensity pulse-neutron sources in a high-intensity proton accelerator facility. We put forward the development of a micro-pixel gas chamber (MPGC) filled with helium-3 gas as the two-dimensional position sensitive neutron detector. The MPGC provides fast responses and very small signals and requires more than 500 signal channels. Therefore, development of an application specific integrated circuit (ASIC) is essential for processing of multi-channel signals from the MPGC. Design and study of the ASIC was performed.

Journal Articles

Development of advanced instrumentation systems for future power reactors

Yamagishi, Hideshi; Kakuta, Tsunemi*

Kyodo Kenkyu Seika Gaiyo, Shoraigata Genshiryoku Hatsuden Gijutsu No Kodoka Ni Kansuru Kenkyu, p.197 - 211, 2006/06

no abstracts in English

JAEA Reports

Study on the spatial resolution of position sensitive neutron gas detector with individual readout

Tanaka, Hiroki; Nakamura, Tatsuya; Yamagishi, Hideshi; Soyama, Kazuhiko; Aizawa, Kazuya

JAEA-Research 2006-014, 17 Pages, 2006/03

JAEA-Research-2006-014.pdf:1.3MB

The position sensitive neutron detector for neutron scattering experiments using intense pulsed neutron source is needed. To meet the detector performance requirements such as fast temporal response $$<$$ 1$$mu$$s, spatial resolution $$<$$ 1mm and detection efficiency $$>$$ 80 % for thermal neutron, we have been developing the micro-strip gas chamber with individual readout. In this paper, we report the simulation results of the spatial resolution of the chamber. This simulation can calculate the spatial resolution by using the distribution of neutron beam and gas condition. The simulation results agreed with the experimental data using the collimated neutron beam. In addition, the results of good uniformity about the spatial resolution and the peak counts were described.

JAEA Reports

Development of 2-d position-sensitive neutron detector with individual readout; Operation test and establishment of detection system by means of neutron beam

Tanaka, Hiroki; Yamagishi, Hideshi; Nakamura, Tatsuya; Soyama, Kazuhiko; Aizawa, Kazuya

JAERI-Research 2005-010, 16 Pages, 2005/04

JAERI-Research-2005-010.pdf:3.39MB

We have been developing the 2-d position-sensitive neutron detector with individual readout as next-generation-type detector system for neutron scattering experiments using intense pulsed neutron source. The detection system is designed to fulfill the specifications required for each neutron spectrometer, such as a count rate, efficiency, neutron/$$gamma$$-ray ratio, a spatial resolution and a size, by using suitable detector heads. The fundamental and imaging performances of the developed system assembled with a Multi-wire proportional counter head were evaluated using a collimated neutron beam. The system worked stably for long hours at the gas pressure of 5 atm with a mixture of 30% C$$_{2}$$H$$_{6}$$ (0.26 atm $$^{3}$$He)at gas gain of 450. The spatial resolutions were 1.4, 1.6 mm (FWHM) for a cathode- and a back strip- direction, respectively, considering a beam size. It was also confirmed that the spatial uniformity of the detection efficiency over the whole sensitive detection area was rather good, $$pm$$8 % deviation from the average with the optimum discrimination level.

Journal Articles

Operation of a capillary plate under high-pressure $$^{3}$$He for neutron detection

Nakamura, Tatsuya; Masaoka, Sei; Yamagishi, Hideshi; Tanaka, Hiroki; Soyama, Kazuhiko; Aizawa, Kazuya

Nuclear Instruments and Methods in Physics Research A, 539(1-2), p.363 - 371, 2005/02

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

We evaluated the neutron-detection performance of a capillary plate under high-pressure helium-3 in terms of the gas gain and the distribution of pulse heights, with the aim of using the device as a neutron detector and a gas preamplification device. The capillary plate exhibited a gas gain of more than 1000 up to a gas pressure of 6 atm with a 5% mixture of ethane, confirming an adequate gas gain as a neutron detector. It was also found that the rise times of the signal pulses were correlated with the range and the emission angle of the secondary particles, protons and tritons, thereby providing useful information for developing a system with position-sensitive readouts with a high spatial resolution and a low background.

Journal Articles

Development of ZnS/$$^{6}$$LiF scintillating and MSGC neutron detectors in JAERI

Nakamura, Tatsuya; Katagiri, Masaki; Yamagishi, Hideshi; Tanaka, Hiroki; Sakasai, Kaoru; Soyama, Kazuhiko

Hamon, 15(1), p.67 - 73, 2005/01

Development of scintillating and gaseous neutron detectors in Japan Atomic Energy Research Institute is briefly described. In this paper, the performances of the developed 2-d neutron detectors, concerning ZnS/$$^{6}$$LiF scintillating detectors with wavelength shifting fiber read-out and micro-strip gas chambers with individual read-out, are presented.

Journal Articles

Usage of a capillary plate as a pre-gas-amplification device for a neutron microstrip gas chamber

Nakamura, Tatsuya; Masaoka, Sei; Yamagishi, Hideshi; Sakasai, Kaoru; Soyama, Kazuhiko; Aizawa, Kazuya

IEEE Transactions on Nuclear Science, 51(4), p.1519 - 1523, 2004/08

 Times Cited Count:2 Percentile:18.92(Engineering, Electrical & Electronic)

A capillary plate (CP) comprising an assembly of fine glass tubes was applied as a pre-gas-amplification device for a microstrip gas chamber (MSGC) operating under high-gas pressure of helium-3 for use in neutron detection. The collection efficiency of the electrons between the CP and MSGC was maximally 17% using neutrons. The effective gas gain of the detector system was $$sim$$600 at a gas pressure of 3 atm with a 10% mixture of ethane with helium-3, confirming the feasibility of the CP as a pre-gas-amplification device. Moreover, we demonstrated that the coincidence measurement of the signals between the CP and the anodes of MSGC decreased the background levels of electronics noise, electronic discharges, and $$gamma$$-rays, indicating that a detector system with a low background can be constructed using the CP.

63 (Records 1-20 displayed on this page)