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熊田 高之; 元川 竜平; 中部 倫太郎; 廣井 孝介; 奥 隆之; 岩瀬 裕希*
no journal, ,
We found that SANS intensity from 99.999% aluminium (5N-Al) is much smaller than that from the alloys, and then developed a 500 mm-diameter 5N-Al window for a vacuum tube of SANS-J at JRR-3. Although the center thickness of 5N-Al window (3 mm) was made larger than that of the alloy window used so far (1 mm) to compensate smaller fracture strength, the scattering from the window was reduced by 10 in maximum. We also demonstrated a novel use of the magnetic lenses without polarizer for the scattering measurements at Q larger than 0.2 nm
by focusing the incident neutron beam with positive spin polarity on the sample position using extended magnetic lenses. The flux of polarized neutron beam became higher than that with non-focused conventional layout by a factor of 30.
中島 健次; Nikolaos, T.*
no journal, ,
The 13th iteration of the Design and Engineering of Neutron Instruments MeetingのSummer Schoolにおける6番目の講義であり、中性子実験装置の概要について述べる。
中部 倫太郎; 熊田 高之
no journal, ,
We planned to improve the polarization to 50%, which is a sufficiently practical level, by increasing the magnetic field to 6.3 T and improving the sample cooling efficiency. The sample cooling efficiency can be improved by the insert design by circulating cryogenic helium gas from the bottom of the sample cell through the top side of the insert, the temperature rise due to microwave application will be reduced.
酒井 基亘*; 篠原 武尚; 川北 至信; 大友 季哉
no journal, ,
The fuel cell is regarded as one of the key devices for reducing greenhouse gas emissions and achieving carbon neutrality. Neutron imaging is anticipated to contribute to fuel cell study especially on its water management by non-destructive observation of generated water inside the cell during the operation. In addition, the operando imaging using the neutron beam is a unique technique to provide direct information about this requirement because of its high transmission ability and the large field of view. We have developed an operation system to drive full-sized fuel cell for automotive which can be used inside the neutron imaging beamline RADEN in J-PARC MLF. It consists of gas supply units for the anode and the cathode lines, which control temperature, humidity, flow rate of each gas independently, back pressure units to control gas pressure in each line, and a load unit to control the power generation.
篠原 武尚; 甲斐 哲也; Su, Y. H.; 土川 雄介; 及川 健一; 林田 洋寿*; Parker, J. D.*; 松本 吉弘*; 永井 佑樹*
no journal, ,
The Energy-resolved neutron imaging system, RADEN, has been constructed in J-PARC MLF in 2014 and started the user operation in 2015. This instrument was designed to enable the energy-resolved neutron imaging experiments, such as Bragg edge imaging and neutron resonance imaging to visualize spatial distributions of crystallographic information and elemental information respectively. To realize excellent performance for these experiments, it was installed at the beamline of BL22. In addition, as the results of continuous developments on energy-resolved neutron imaging techniques using time-of-flight (TOF) analysis and on the related devices, the polarimetric neutron imaging and the neutron imaging with the grating interferometry became available in combination with wavelength/energy analysis. Accordingly, RADEN becomes a quite unique instrument in the world that can offer opportunities of conducting almost all energy-resolved neutron imaging experiments.
廣井 孝介; 熊田 高之; 中部 倫太郎; 元川 竜平; 奥 隆之
no journal, ,
In small-angle neutron scattering (SANS) measurement, incoherent scattering components from samples are observed as background that does not have structural information. The incoherent scattering component can be experimentally estimated and separated from the coherent scattering one by separately observing spin-flip and non-spin-flip scattering components using polarization analysis. There are some SANS instruments that have such polarization analysis option in Japan, BL15 TAIKAN at Material and Life science Experimental Facility (MLF) of J-PARC and SANS-J of JRR-3. In this presentation, we will introduce polarization analysis setups of TAIKAN and SANS-J and show recent experimental results.