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
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.
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
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.
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
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
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.
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.
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.