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Parker, J. D.*; 原田 正英; 林田 洋寿*; 廣井 孝介; 甲斐 哲也; 松本 吉弘*; 中谷 健; 及川 健一; 瀬川 麻里子; 篠原 武尚; et al.
Materials Research Proceedings, Vol.15, p.102 - 107, 2020/05
At the RADEN instrument, we take advantage of the accurate measurement of neutron energy by time-of-flight to perform energy-resolved neutron imaging using event-type neutron imaging detectors. We are continually working to improve these detectors for better spatial resolution and shorter measurement times and, as a user facility, to improve the ease-of-use of their control and analysis software. In particular, we are actively developing a 
He-based gaseous micropattern detector known as the Micro-pixel chamber based Neutron Imaging Detector (
NID). We have recently redesigned the NID control software to allow full integration into the automated experiment control system at RADEN, and we are carrying out optimization of the analysis algorithms for improved image quality and rate performance.
大場 洋次郎; 伊藤 大介*; 齊藤 泰司*; 小野寺 陽平*; Parker, J. D.*; 篠原 武尚; 及川 健一
Materials Research Proceedings, Vol.15, p.160 - 164, 2020/02
溶融鉛ビスマス(LBE)は加速器駆動システム(ADS)や高速炉等の冷却材として研究が進められている。近年、エネルギー分析型中性子イメージングが、配管内におけるLBEの解析に有効であることが報告された。しかしながら、従来の手法は、固相のブラッグ回折によって生じる透過率の減少であるブラッグエッジの解析にとどまっており、液相の解析は行われていなかった。液相の散乱によっても透過率の減少が生じるはずであり、この成分を観測して解析できれば、熱流動の主役である液相の情報を得て、これをマッピングすることができるようになる。そこで、溶融状態のLBEのエネルギー分析型中性子イメージング測定を行った。その結果、振動等を含む特徴的な透過率スペクトルを観測した。この特徴は、溶融LBEの散乱プロファイルから計算した透過率スペクトルと一致していることから、透過率スペクトルに液相の散乱が反映されていることが明らかになった。
及川 健一; 鬼柳 善明*; 佐藤 博隆*; 大前 良磨*; Pham, A.*; 渡辺 賢一*; 松本 吉弘*; 篠原 武尚; 甲斐 哲也; Harjo, S.; et al.
Materials Research Proceedings, Vol.15, p.207 - 213, 2020/02
Japanese swords are very attractive not only as a work of art but also a metallurgical point of view. Since Japanese vintage swords became valuable, it is indispensable to establish non-destructive analysis method to identify some peculiar characteristics. Bragg edge imaging gives real-space distributions of bulk information in a crystalline material as well as neutron tomography. In this work, we investigated crystallographic information of a Japanese sword made by Sukemasa in Izumi province in the first quarter of the 16th century. The experiments have been performed at RADEN at J-PARC. The Sukemasa sword was measured with a counting-type 2D detector and with a CCD camera. We are now analyzing the measured 2D-transmission spectra using RITS code to obtain spatial distribution of the crystallite size, the texture variation, the d110 shift and its broadening. Complementary data analysis using white beam tomography is also on going. Detailed analysis results will be presented.
甲斐 哲也; 廣井 孝介; Su, Y. H.; 瀬川 麻里子; 篠原 武尚; 松本 吉弘*; Parker, J. D.*; 林田 洋寿*; 及川 健一
Materials Research Proceedings, Vol.15, p.149 - 153, 2020/02
A two-dimensional thermometry technique based on neutron resonance reactions derives the temperature of specified elements in an object by analyzing the Doppler broadening of a neutron resonance measured by a time-analyzing neutron imaging-detector. This technique is expected to be one of the important applications of the energy-resolved neutron imaging system, RADEN, at J-PARC. The authors focused on molybdenum contained in 316 stainless-steel (with a weight fraction of 2-3 wt%). Energy-dependent transmitted neutrons were measured through a 3 mm thick 316 stainless-steel plate placed in a heater at temperatures between 23 and 500 degrees Celsius at RADEN using a gas-electron multiplier (GEM) detector. Thermal and cold neutrons were eliminated from the incident beam by a cadmium filter. The sample area within the neutron beam was 30 by 50 mm
. The feasibility is discussed in the presentation.
瀬川 麻里子; 藤 暢輔; 甲斐 哲也; 木村 敦; 中村 詔司
no journal, ,
In this study, several sealed radioactive samples used for neutron capture reaction measurements were visualized using an energy-resolved neutron imaging technique at Beam line No.4 (ANNRI), installed in the J-PARC Materials and Life Science Experimental Facility. To derive physical quantities related to the neutron capture reactions, it is important to check the internal state of the sealed samples, such as with or without crack and uniformity. We demonstrated images with enhanced contrast in corresponding resonance energy regions for the radioactive samples by the present technique, and verified the state inside of the samples from the obtained images.
篠原 武尚; 甲斐 哲也; 及川 健一; 瀬川 麻里子; 中谷 健; 林田 洋寿*; 松本 吉弘*; Parker, J. D.*; 廣井 孝介; Su, Y. H.; et al.
no journal, ,
The world's first pulsed neutron imaging instrument dedicated to energy-resolved neutron imaging experiments, named RADEN, was constructed at beam port 22 in the Materials and Life Science Experimental Facility of J-PARC. This instrument is designed to conduct state-of-the-art energy-resolved neutron imaging together with conventional/energy-selective neutron radiography and tomography by fully utilizing the high intensity, short-pulsed neutron beam. In this presentation, we will report the current status of RADEN along with recent results of the technical development and application studies regarding energy-resolved neutron imaging techniques conducted at RADEN.
廣井 孝介; 篠原 武尚; 林田 洋寿*; Parker, J. D.*; 甲斐 哲也; 鬼柳 善明*
no journal, ,
Observation of magnetic fields emanating from electromagnetic devices gives important information on not only their structural and functional soundness but also on energy loss under operating conditions. A magnetic imaging technique using pulsed polarized neutrons would be suitable for direct observation of such magnetic fields because it enables us to visualize the field distributions in both massive objects and free space with a large field of view up to several square centimeters. We have developed such a pulsed polarized neutron imaging technique at BL22 RADEN at the Materials and Life Science Experimental Facility (MLF) of J-PARC and performed demonstration studies. In this presentation, we report recent results of a leaked field study from the operating electric transformer and discuss the relationship between the eddy current loss in the step-lap core and the leaked field distribution.
