Activity of Hokkaido University Neutron Source, HUNS

Furusaka, M.; Sato, Hirotaka; Kamiyama, Takashi; Ohnuma, Masato; Kiyanagi, Yoshiaki

doi:10.1016/j.phpro.2014.11.024

Cited by 45 publications

(19 citation statements)

References 25 publications

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“…For example, the use of a beam-focusing device enables the setup of a very compact smallangle scattering instrument, i.e., mini-focusing SANS, which has demonstrated the collection of highquality data. [39] …”

Section: Huns-the Hokkaido University Neutron Sourcementioning

confidence: 99%

Research opportunities with compact accelerator-driven neutron sources

et al. 2016

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Since the discovery of the neutron in 1934 neutron beams have been used in a very broad range of applications, As an aging fleet of nuclear reactor sources is retired the use of compact accelerator-driven neutron sources (CANS) are becoming more prevalent. CANS are playing a significant and expanding role in research and development in science and engineering, as well as in education and training. In the realm of multidisciplinary applications, CANS offer opportunities over a wide range of technical utilization, from interrogation of civil structures to medical therapy to cultural heritage study. This paper aims to provide the first comprehensive overview of the history, current status of operation, and ongoing development of CANS worldwide. The basic physics and engineering regarding neutron production by accelerators, target-moderator systems, and beam line instrumentation are introduced, followed by an extensive discussion of various evolving applications currently exploited at CANS.

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Section: Huns-the Hokkaido University Neutron Sourcementioning

confidence: 99%

Research opportunities with compact accelerator-driven neutron sources

et al. 2016

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“…Additionally, interest is not only in such big facilities, but also in the development of Compact Accelerator-based Neutron Sources (CANSs) for use in small installations in universities and industrial locations, due to the shutting down of many of small research reactors in recent years [4]. In Japan, many CANSs have been developed [5]: Hokkaido University Neutron Source (HUNS) [6], Aomori Prefecture Quantum Science Center [7], Riken Accelerator-driven Neutron Source (RANS) [8], Kyoto University Accelerator-driven Neutron Source (KUANS) [9], Kyoto University Research Reactor Institute LINAC (KURRI-LINAC) [10] and Sumitomo Heavy Industry ATEX (SHI-ATEX) [11].…”

Section: Introductionmentioning

confidence: 99%

Neutron spectrum change with thermal moderator temperature in a compact electron accelerator-driven neutron source and its effects on spectroscopic neutron transmission imaging

Ishikawa

Kai

Sato

et al. 2019

Journal of Nuclear Science and Technology

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Recently, Compact Accelerator-driven Neutron Sources (CANSs) are attracting attention.In CANSs, a simple thermal neutron moderator such as polyethylene is often used from the viewpoints of cost, simplicity and maintainability. In most cases, the temperature of such a moderator has not been controlled although it is natural that the moderator temperature and the neutron spectrum will change with accelerator-operation. Thus, we simultaneously measured neutron spectra and the temperature of a polyethylene moderator at the Hokkaido University Neutron Source (HUNS) driven by a compact electron accelerator to observe the effect of any temperature change on the reliability of spectroscopic transmission measurement. The ratio of the neutron effective temperature and the moderator temperature was constant in HUNS case, although both increased by 4-5 K within one hour after the start of accelerator-operation. This indicated that the neutron effective temperature was well estimated by the moderator temperature. The effect of the temperature change can be easily avoided by excluding data collection before the moderator warms up. These results suggested that the monitoring of moderator temperature is recommended in compact electron accelerator-driven neutron sources with a thermal 1 ARTICLE Typeset with jnst.cls neutron moderator to guarantee reliability of spectroscopic transmission measurement without sacrifices of cost, simplicity and maintainability.

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“…The pulsed neutron transmission imaging experiment was performed at a cold neutron beam-line connected to a coupled-type 20 K solid CH 4 moderator installed at the Hokkaido University Neutron Source (HUNS) [35,36] in Japan. HUNS is a pulsed neutron experimental facility based on 1.2 kW electron LINAC, which is one of compact accelerator driven neutron sources [37].…”

Section: Spectrum Fitting Analysis Resultsmentioning

confidence: 99%

“…At such world-leading facilities, higher level experiments will be performed than the experiments presented in this paper. Additionally, activities at compact accelerator driven pulsed neutron sources such as HUNS [35,36,44,47] are recently enhanced by collaboration between academic society and industrial society. The Bragg-edge/dip neutron transmission imaging is expected to become a key technology for materials characterization performed at both types of neutron beam facility.…”

Section: Discussionmentioning

confidence: 99%

Deriving Quantitative Crystallographic Information from the Wavelength-Resolved Neutron Transmission Analysis Performed in Imaging Mode

Sato

2017

J. Imaging

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Current status of Bragg-edge/dip neutron transmission analysis/imaging methods is presented. The method can visualize real-space distributions of bulk crystallographic information in a crystalline material over a large area (~10 cm) with high spatial resolution (~100 µm). Furthermore, by using suitable spectrum analysis methods for wavelength-dependent neutron transmission data, quantitative visualization of the crystallographic information can be achieved. For example, crystallographic texture imaging, crystallite size imaging and crystalline phase imaging with texture/extinction corrections are carried out by the Rietveld-type (wide wavelength bandwidth) profile fitting analysis code, RITS (Rietveld Imaging of Transmission Spectra). By using the single Bragg-edge analysis mode of RITS, evaluations of crystal lattice plane spacing (d-spacing) relating to macro-strain and d-spacing distribution's FWHM (full width at half maximum) relating to micro-strain can be achieved. Macro-strain tomography is performed by a new conceptual CT (computed tomography) image reconstruction algorithm, the tensor CT method. Crystalline grains and their orientations are visualized by a fast determination method of grain orientation for Bragg-dip neutron transmission spectrum. In this paper, these imaging examples with the spectrum analysis methods and the reliabilities evaluated by optical/electron microscope and X-ray/neutron diffraction, are presented. In addition, the status at compact accelerator driven pulsed neutron sources is also presented.

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Activity of Hokkaido University Neutron Source, HUNS

Cited by 45 publications

References 25 publications

Research opportunities with compact accelerator-driven neutron sources

Research opportunities with compact accelerator-driven neutron sources

Neutron spectrum change with thermal moderator temperature in a compact electron accelerator-driven neutron source and its effects on spectroscopic neutron transmission imaging

Deriving Quantitative Crystallographic Information from the Wavelength-Resolved Neutron Transmission Analysis Performed in Imaging Mode

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