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) solution-NaNO-Glass frit by XAFS measurementNagai, Takayuki; Kobayashi, Hidekazu; Okamoto, Yoshihiro; Akiyama, Daisuke*; Sato, Nobuaki*
no journal, ,
no abstracts in English
Fukaya, Yuki
no journal, ,
no abstracts in English
Aso, Tomokazu; Teshigawara, Makoto; Hasegawa, Shoichi; Muto, Hideki; Aoyagi, Katsuhiro; Nomura, Kazutaka; Takada, Hiroshi
no journal, ,
no abstracts in English
Oi, Motoki; Teshigawara, Makoto; Harada, Masahide; Takada, Hiroshi
no journal, ,
In the spallation neutron source of the Japan Proton Accelerator Complex (J-PARC), generated neutrons are moderate in liquid hydrogen moderators and supplied to neutron instruments. The design life of the reflector and the moderator is 30,000 MWh (6 years at 1 MW), and we are preparing spare reflector and moderators. In the first ones, Ag-In-Cd alloy decoupler is used, but in order to reduce the residual radioactivity, Au-In-Cd alloy decoupler was developed and adapted to the spare reflector and moderators. It performed R&D about HIP bonding with aluminum alloy, manufacturing and processing method of the Au-In-Cd alloy. In HIP bonding, the optimal conditions were determined by the bonding test using temperature, time, surface condition, etc. as parameters, and these were applied to the spare reflector and moderators. The spare reflector was delivered at the end of FY2015, and now we are preparing decoupled moderators and poisoned moderators with Au-In-Cd alloys.
Baba, Yuji; Shimoyama, Iwao
no journal, ,
no abstracts in English
Harada, Masahide; Kawakami, Kazuhiro*; Aizawa, Kazuya; Soyama, Kazuhiko; Sato, Koichi; Masuyama, Koichi; Kasugai, Yoshimi
no journal, ,
no abstracts in English
Nakatani, Takeshi; Takahashi, Ryuta*; Moriyama, Kentaro*
no journal, ,
We carry out the experimental control with the standard instrument control software framework "IROHA2" in MLF, J-PARC. We have developed the IROHA2 device modules for the 7T magnet and the Nb furnace which are the common sample environment devices in MLF. The 7T magnet is the device to make a strong magnetic field to be applied on the sample with the superconducting magnet. The 7T magnet is the complex device composed of the power supply to make a current to be applied on the electric magnet, the refrigerators for the sample and the magnet, the helium liquid level gauge and the rotation controller for the sample. The Nb furnace is the device which make the sample a high temperature by an electric heat. The Nb furnace is monitored with reading out the status from the programmable logic controller and the recorder. Because we have developed the software modules for these devices, users can do an experiment easily integrated the devices and the data acquisition system in the instrument.
Okamoto, Yoshihiro; Nagai, Takayuki; Kobayashi, Hiromi*; Hatakeyama, Kiyoshi*; Shiwaku, Hideaki
no journal, ,
Chemical correlation analysis between different elements in the simulated nuclear waste glass samples was performed by using imaging XAFS technique. We have used this new technique in the study of chemical behavior of platinoid elements in the borosilicate nuclear waste glass. In the present study, the simulated nuclear waste glass prepared by several kinds of conditions were analyzed by the imaging XAFS technique.
Inamura, Yasuhiro; Nakatani, Takeshi; Ito, Takayoshi*; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Suzuki, Jiro*
no journal, ,
The energy excitations in the 3-dimentional space of momentum transfer are measured as the neutron scattering intensity in 4-dimensional space Q1, Q2, Q3, energy. But this measurement region is limited by the position of detectors, the incident energy and the orientation of the sample. To achieve this measurement more efficiently, we improved some functions in Utsusemi software in order to analyze and visualize the event data from the neutron scattering measurement under rotating the sample orientation continuously. Main improvement about this is to add event filtering and analysis functions into differential data reduction, so called pseude-online monitoring function. As the result, we can see the data under the measurement in near real time.
Kubota, Masato; Sakurai, Takeaki*; Miyadera, Tetsuhiko*; Nakao, Hironori*; Sugita, Takeshi*; Yoshida, Yuji*
no journal, ,
no abstracts in English
Ito, Takashi
no journal, ,
no abstracts in English
Kodama, Katsuaki; Ikeda, Kazutaka*; Shamoto, Shinichi; Otomo, Toshiya*
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no abstracts in English
Watanabe, Masao; Nojiri, Hiroyuki*; Ito, Shinichi*; Kawamura, Seiko; Kihara, Takumi*; Masuda, Takatsugu*; Sahara, Takuro*; Soda, Minoru*; Takahashi, Ryuta
no journal, ,
Recently, neutron and radiation beam scattering experiments have been rapidly progressed under high magnetic field more than a few tens Tesla. In the J-PARC MLF, proto-type compact pulse magnet system has been developed for the user's request. The pulsed magnet system consist of (1) a capacitor bank power supply, (2) a small solenoid coil and (3) a cryostat-insert. The capacitor bank power supply is movable using casters in order to be used for each beam-line. Superconducting DC magnet up to 17 T has already developed for neutron scattering experiments, so we made the coil which generate higher magnetic fields up to 30 T. We developed a cryostat-insert for Orange-cryostat which has often been used in neutron experiments. In this presentation, we report measurement results of characteristics of the pulsed magnet system in high resolution chopper spectrometer (HRC).
Naoe, Takashi; Xiong, Z.*; Futakawa, Masatoshi
no journal, ,
At J-PARC, a mercury target for neutron source (made of 316L SS) suffers not only proton and neutron radiation damage by proton and neutron but also cyclic impact stress caused by pressure waves. The number of impact stresses exceeds 
in the design operating period for 2500 hours at 1 MW. Recently, it was reported that the fatigue failure occurs below the fatigue limit which was determined by a test up to 10
cycles. In this study, we carried out an ultrasonic fatigue test to investigate the gigacycle fatigue strength of 316L SS and its welded material, concluding that an obvious fatigue limit was not observed below 10
cycles for 316L SS. Smoothed weld material which removed weld bead showed higher fatigue strength than that of base metal. By contrast, the fatigue strength of the weld material with bead decreased below that of base metal due to the stress concentration at the weld toe.
Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Kamazawa, Kazuya*; Ikeuchi, Kazuhiko*; Iida, Kazuki*; Ishikado, Motoyuki*; Murai, Naoki; Nakatani, Takeshi; Kubo, Naoya*; et al.
no journal, ,
no abstracts in English
He spin filter developmentOku, Takayuki; Sakai, Kenji; Hiroi, Kosuke; Watanabe, Masao; Shinohara, Takenao; Aizawa, Kazuya; Kakurai, Kazuhisa*; Kira, Hiroshi*; Hayashida, Hirotoshi*; Kiriyama, Koji*; et al.
no journal, ,
We have been developing a He neutron spin filter for application at J-PARC MLF. The He neutron spin filter is available for neutrons in a wide energy range, and is also effective for a divergent neutron beam. Therefore, it is very useful in the neutron scattering experiment. So far, we have developed a compact laser optics with a volume holographic grating (VHG) elements, and have constructed an on-beam SEOP based He neutron spin filter. The polarization analysis tests were performed with the He neutron spin filter at several neutron beamlines for the sans, reflectivity and neutron imaging experiments. To extend the application range of the He neutron spin filter at J-PARC MLF, we plan to develop larger size cells, higher power laser for the SEOP, and prepare working area for the filter inside the MLF experimental hall.