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論文

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

 被引用回数:1 パーセンタイル:8.64

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.

論文

Time-of-flight neutron transmission imaging of martensite transformation in bent plates of a Fe-25Ni-0.4C alloy

Su, Y.; 及川 健一; 篠原 武尚; 甲斐 哲也; 廣井 孝介; Harjo, S.; 川崎 卓郎; Gong, W.; Zhang, S. Y.*; Parker, J. D.*; et al.

Physics Procedia, 88, p.42 - 49, 2017/06

 被引用回数:1 パーセンタイル:14.69

The influences of bending deformation and subsequent subzero treatment on the martensite transformation behaviors in a metastable austenitic alloy Fe-25Ni-0.4C were investigated by the time-of-flight (TOF) neutron Bragg-edge transmission (BET) imaging method. Two-dimensional (2D) maps of martensite phase volume fractions and texture variations due to residual stress and lowering the temperature of the bent samples before and after subzero treatment were obtained by Bragg-edge spectral analysis. The obtained phase volume fractions were quantitatively compared with those determined by neutron diffraction.

論文

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

 被引用回数:1 パーセンタイル:14.69

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。

論文

Experimental evaluation of neutron absorption grating fabricated by oblique evaporation of gadolinium for phase imaging

關 義親; 篠原 武尚; 上野 若菜; Parker, J. D.*; 佐本 哲雄*; 矢代 航*; 百生 敦*

Physics Procedia, 88, p.217 - 223, 2017/00

 被引用回数:4 パーセンタイル:0.61

Talbot-Lau interferometry with three gratings is a powerful imaging method which produces a radiography image, a differential phase imaging, and a visibility contrast image at one measurement. We develop a new neutron Talbot-Lau interferometer at "RADEN" beam line on the Materials and Life Science Experimental Facility (MLF) in Japan Proton Accelerator Research Complex (J-PARC). Since the alignment condition of Talbot-Lau interferometer allows use of several wavelengths at the same setup of gratings, we can carry out wavelength-resolved phase contrast imaging with time-of-flight measurement. This method utilizes intensive beam of spallation neutron source with avoidance of chromatic aberration at the sample, and gives more detailed sample information depending on wavelength. We have successfully performed Talbot-Lau imaging for several types of metal rods with wavelengths of 2.5, 5.0 and 7.5 A.

口頭

Magnetic imaging of an AC field applied electric steel using polarized pulsed neutrons at J-PARC/MLF

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

no journal, , 

Electric steels are widely used as a key material in magnetic industrial products, whose magnetic properties define the performance and energy efficiency. Since the magnetic properties of an electric steel strongly depends on the internal domain structure, understanding of the domain structure and its response to an AC magnetic field is necessary for improving energy efficiency of electric devices. In this study, we aim to visualize both the internal domain motion of an electric steel under the AC field and the leakage field emanating from it. A ring-shaped grain oriented Fe-Si steel was used as a sample, which was magnetized by an AC field produced by a coil wound around it. Polarization images were obtained by the time-of-flight method and then wavelength dependent polarization was analyzed around the boundary of an easy-to-magnetize region and a hard-to-magnetize region of the steel sample. In this presentation we will show the polarization imaging results of the AC field applied electric steel and discuss the dynamic behavior of the leakage field from the steel sample and the magnetic structure within it.

口頭

Status of the energy-resolved neutron imaging system RADEN at J-PARC

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

no journal, , 

The first pulsed neutron imaging instrument "RADEN" has been constructed at beam line BL22 of the Materials and Life Science Experimental Facility (MLF) at J-PARC. RADEN is focused on the full operation of energy-resolved neutron imaging experiments together with the typical neutron radiography/tomography, and consequently is expected not only to support a wide area of nondestructive inspection studies but also to develop a new research field by means of new neutron imaging techniques using energy dependent transmission analysis. The construction of RADEN was completed in 2014, and started on-beam commissioning. In this presentation, we report the current status of the new pulsed neutron imaging instrument RADEN at J-PARC.

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