J-PARC物質・生命科学実験施設の全体制御システムの進捗状況

酒井 健二; 大井 元貴; 高田 弘; 甲斐 哲也; 中谷 健; 小林 庸男*; 渡邊 聡彦*

JAEA-Technology 2018-011, 57 Pages, 2019/01

JAEA-Technology-2018-011.pdf:4.98MB

核破砕中性子源やミュオン標的などを安全に効率よく運転するために、物質・生命科学実験施設(MLF)は、専用の全体制御システム(GCS)を持ち、運転状況に応じた機器の監視操作やインターロックを運用している。GCSは、その役割に応じて、ネットワーク系(LAN), 統括制御系(ICS), サーバー, インターロック系(ILS), タイミング配信系(TDS)など幾つかのサブシステムで構成される。GCSは、MLF内の機器を独自に運転制御する一方、J-PARCの加速器や他実験施設と連動しながらMLFの安定したビーム運転を実現している。2008年度のビーム運転開始以来、GCSは運転制御コミッショニングに基づく改修を経て、システム性能を継続的に維持する視点から、ICSの大幅なアップグレードやILSの機能拡張を実施してきた(2010年度-2015年度)。この様に運転開始から約10年間、GCSには全般に渡って数多くの追加・変更がなされてきた。したがってGCS高度化の今後の方向性を決めるために、これまでの高度化の履歴とGCSの現況を把握することが重要と考え、2017年度時のGCSの構成・機能・役割を整理して取り纏めた。

Study of the magnetization distribution in a grain-oriented magnetic steel using pulsed polarized neutron imaging

廣井 孝介; 篠原 武尚; 林田 洋寿*; Parker, J. D.*; Su, Y.; 及川 健一; 甲斐 哲也; 鬼柳 善明*

Physica B; Condensed Matter, 551, p.146 - 151, 2018/12

http://dx.doi.org/10.1016/j.physb.2018.05.013

Grain oriented magnetic steel is widely used as a key material for magnetic industrial products. Since magnetic properties of steels are closely related to its magnetic domain structure, observation of the domain structure is important for understanding its magnetic properties. In this study, we attempted to observe the domain structure of a grain oriented steel using polarized pulsed neutron imaging. In the experiment, we first magnetized the sample by applying a magnetic field along the easy-to-magnetize direction via a coil, and confirmed the sample was magnetized almost uniformly from the obtained polarization distribution images. By analyzing the oscillatory behavior in the wavelength dependence of polarization, magnetization of the steel was estimated to be 1.82 T. Then, we removed the field and performed the same measurement. As a result, a striped domain structure was observed, with neighboring domains aligned anti-parallel to each other. From these results, it was demonstrated that our magnetic imaging method could visualize the magnetization and the direction of the domains in the practical steel.

Development of a polarization analysis method for visualization of the magnetic field distribution in a small electric transformer using pulsed polarized neutron imaging

廣井 孝介; 篠原 武尚; 林田 洋寿*; Parker, J. D.*; 及川 健一; Su, Y.; 甲斐 哲也; 鬼柳 善明*

JPS Conference Proceedings (Internet), 22, p.011030_1 - 011030_7, 2018/11

https://doi.org/10.7566/JPSCP.22.011030

We have been developing magnetic imaging method for industrial products using polarized pulsed neutrons. In this presentation, we report observation results of magnetic field distribution in a small electric transformer as a demonstration of our magnetic imaging method. The polarized pulsed neutron imaging experiment was performed at BL22 RADEN at MLF of J-PARC. 9 polarization distribution images were obtained with changing incident polarization and analyzing direction in 3D. By analyzing wavelength dependent polarization position by position, distribution of field strength and direction around the core of the transformer were successfully visualized. Obtained field distribution images were well corresponded with that expected by the simulation and clearly demonstrated a leaked field from the gap of step lap.

Off-gas processing system operations for mercury target vessel replacement at J-PARC

甲斐 哲也; 内田 敏嗣; 木下 秀孝; 関 正和; 大井 元貴; 涌井 隆; 羽賀 勝洋; 春日井 好己; 高田 弘

Journal of Physics; Conference Series, 1021(1), p.012042_1 - 012042_4, 2018/06

https://doi.org/10.1088/1742-6596/1021/1/012042

At J-PARC an Off-gas processing system has been utilized to a purging process before the target vessel replacement and an air-flow control procedure to minimize radioactivity release during the replacement. In 2011 the first replacement was carried out after a 500 MWh operation, and the tritium release was measured. It was suggested that the tritium release must be less than that measured at the replacement in 2011 even at the nominal operation of 5,000 MWh. Some procedures of an air-flow control and a rubber plug insertion have been introduced from the replacements in 2013, resulting that the amount of tritium release could be reduced to less than that released in 2011 at the nominal operation.

Deformation analysis of reinforced concrete using neutron imaging technique

小山 拓*; 上野 一貴*; 関根 麻里子*; 松本 吉弘*; 甲斐 哲也; 篠原 武尚; 飯倉 寛; 鈴木 裕士; 兼松 学*

Materials Research Proceedings, Vol.4, p.155 - 160, 2018/05

http://dx.doi.org/10.21741/9781945291678-24

We developed, in this study, a novel method to observe internal deformation of concrete by the neutron transmission imaging technique. In order to visualize the internal deformation of concrete, the cement paste markers containing GdO powder were two-dimensionally dispersed around the ferritic deformed rebar in the reinforced concrete. This experiment was conducted using BL22, RADEN, in the Material and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex. The transmission images of the reinforced concrete sample were taken at several positions on the vertical sample stage, and the displacement of the marker from the initial position was successfully evaluated within approximately 0.1 mm accuracy by image analysis for selected markers with higher contrast and circularity. Furthermore, concrete deformation under pull-out loading to the embedded rebar was evaluated by the same way, and its reaction compressive deformation was successfully observed by analyzing the displacement of the markers. The results obtained in this study bring beneficial knowledge that the measurement accuracy of the marker displacement can be improved more by choosing a spherical shape of the marker and by increasing the contrast of the marker.

Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex, 2; Neutron scattering instruments

中島 健次; 川北 至信; 伊藤 晋一*; 阿部 淳*; 相澤 一也; 青木 裕之; 遠藤 仁*; 藤田 全基*; 舟越 賢一*; Gong, W.*; et al.

Quantum Beam Science (Internet), 1(3), p.9_1 - 9_59, 2017/12

http://dx.doi.org/10.3390/qubs1030009

J-PARC物質・生命科学実験施設の中性子実験装置についてのレビューである。物質・生命科学実験施設には23の中性子ビームポートがあり21台の装置が設置されている。それらは、J-PARCの高性能な中性子源と最新の技術を組み合わせた世界屈指の実験装置群である。このレビューでは、装置性能や典型的な成果等について概観する。

Reliability estimation of neutron resonance thermometry using tantalum and tungsten

甲斐 哲也; 廣井 孝介; Su, Y.; 篠原 武尚; Parker, J. D.*; 松本 吉弘*; 林田 洋寿*; 瀬川 麻里子; 中谷 健; 及川 健一; et al.

Physics Procedia, 88, p.306 - 313, 2017/06

https://doi.org/10.1016/j.phpro.2017.06.042

Neutron resonance thermometry, which measures material temperature by analyzing the Doppler broadening of a neutron resonance peak, is one of the applications of energy-resolved neutron imaging at RADEN of J-PARC. Although this technique is promising, advantages and disadvantages have not been discussed in practical applications. The authors measured neutron transmission rates of tantalum and tungsten foils in a heater chamber up to 300 degrees Celsius at RADEN. The energy-dependent neutron transmission rates with different statistics were obtained after the measurements by selecting arbitrary measuring intervals from one measurement, and the temperatures of the foils were estimated from those transmission rates with different statistics. The reliability of the neutron resonance thermometry with statistical accuracy, irradiation time and spatial resolution are discussed.

A Comparative study of the crystallite size and the dislocation density of bent steel plates using Bragg-edge transmission imaging, TOF neutron diffraction and EBSD

及川 健一; Su, Y.; 友田 陽*; 川崎 卓郎; 篠原 武尚; 甲斐 哲也; 廣井 孝介; Zhang, S.*; Parker, J. D.*; 佐藤 博隆*; et al.

Physics Procedia, 88, p.34 - 41, 2017/00

http://dx.doi.org/10.1016/j.phpro.2017.06.004

TOFブラッグエッジ透過イメージング法を用い、塑性変形させた曲げ鉄鋼試料の微細構造を解析し、得られた結果を中性子回折法及びEBSD法により比較検証を行った。その結果、テキスチャ等は非常に良い一致を示したが、結晶子サイズを中性子回折法による消衰効果から見積もることはうまく行かなかった。そこで、回折プロファイルのブロードニング幅解析から結晶子サイズを求めることを試み、またEBSD法から結晶歪みの解析結果も合わせて再検討を行った。

Time-of-flight neutron Bragg-edge transmission imaging of microstructures in bent steel plates

Su, Y.; 及川 健一; Harjo, S.; 篠原 武尚; 甲斐 哲也; 原田 正英; 廣井 孝介; Zhang, S.*; Parker, J. D.*; 佐藤 博隆*; et al.

Materials Science and Engineering A, 675, p.19 - 31, 2016/10

http://dx.doi.org/10.1016/j.msea.2016.08.037

Neutron Bragg-edge transmission imaging makes it possible to quantitatively visualize the two-dimensional distribution of microstructure within a sample. In order to examine its application to engineering products, time-of-flight Bragg-edge transmission imaging experiments using a pulsed neutron source were performed for plastically bent plates composed of a ferritic steel and a duplex stainless steel. The non-homogeneous microstructure distributions, such as texture, crystalline size, phase volume fraction and residual elastic strain, were evaluated for the cross sections of the bent plates. The obtained results were compared with those by neutron diffraction and electron back scatter diffraction, showing that the Bragg-edge transmission imaging is powerful for engineering use.

J-PARCエネルギー分析型中性子イメージング装置RADENの現状

甲斐 哲也; 篠原 武尚

Isotope News, (746), p.20 - 24, 2016/08

http://www.jrias.or.jp/books/pdf/201608_TENBO_KAI_SHINOHARA.pdf

2015年から一般利用者による利用を開始したエネルギー分析型中性子イメージング装置RADENの装置概要、及びこれまでに得られたテスト撮影の結果や利用状況について紹介する。