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Haga, Katsuhiro; Wakui, Takashi; Naoe, Takashi; Kogawa, Hiroyuki; Kinoshita, Hidetaka; Teshigawara, Makoto; Kasugai, Yoshimi; Seki, Masakazu; Hanano, Kohei; Suzuki, Toru; et al.
no journal, ,
Pitting damage of the target vessel wall is the crucial issue for the development of the high power mercury target. The damage is affected by the target vessel structure and the proton beam condition. In order to improve the evaluation accuracy of the pitting depth, the data of the pitting damage in the J-PARC mercury target was indispensable. Because the first target vessel of J-PARC was damaged by the earthquake, the preparations for cutting out specimens were carried out in advance. The surface dose rate is more than 10micro Sv/h. Then, we developed the cutting machine using hole saw, and we succeeded in cutting out specimens of the outer diameter of 50 mm. A spot which seems the cavitation damage was found by visual observation. The target replacement was also successfully finished. The radioactive gas release was more than the expectation, and it roused the necessity of reconsider the off-gas treatment system.
Takeda, Masayasu; Suzuki, Junichi*
no journal, ,
no abstracts in English
Shibata, Kaoru*; Takahashi, Nobuaki; Kawakita, Yukinobu; Kamazawa, Kazuya*; Yamada, Takeshi*; Ueno, Hiroki; Shimakura, Hironori; Nakajima, Kenji; Kambara, Wataru; Inamura, Yasuhiro; et al.
no journal, ,
no abstracts in English
Igawa, Naoki; Nagasaki, Takanori*; Taguchi, Tomitsugu; Hoshikawa, Akinori*; Ishigaki, Toru*; Morii, Yukio*; Hayashi, Makoto*
no journal, ,
The temperature dependence of crystal structure of proton conductor, BaSn
InO
was analyzed in the temperature range from 10 to 790 K by in-situ neutron diffraction. We found that the crystal structure of the sample is cubic perovskite-type structure with the space group of 
-3
. Atomic displacement parameters of each atom were relatively large even at 10 K and those were increasing with the temperature. Those phenomena indicate the crystal structure had local static/dynamic disorders which influence the proton diffusion.
SR studies of 
Al
(
: Pr, Sm, 
: Ti, V, Cr) with a cage structureIto, Takashi; Higemoto, Wataru; Ninomiya, Kazuhiko; Sakai, Akito*; Nakatsuji, Satoru*
no journal, ,
no abstracts in English
Abe, Jun; Sekine, Kotaro*; Harjo, S.; Ito, Takayoshi*; Arima, Hiroshi*; Aizawa, Kazuya
no journal, ,
This study aims at the development of neutron diffraction technique of geological materials. Measurements of residual strain in a rock sample and in situ strain measurement on rock specimens under uniaxial compression have been performed at the Engineering Materials Diffractometer at J-PARC. In the residual strain measurements, anisotropy of strain value in respect to the direction was found. On the otherhand, in the in situ strain measurements, diffraction peaks shifted to lower value depend on compressive load. The Engineering Materials Diffractometer at J-PARC has potential ability to clarify strain distribution inside rock specimen nondestructively. In situ strain measurements on rock specimens under various conditions will provide us a new insight into rock deformation and rock fracturing mechanism.
H
ONH
-PbBr
Kawasaki, Takuro; Takahashi, Miwako*; Oshima, Kenichi*; Ohara, Takashi*; Tanaka, Ichiro*; Kusaka, Katsuhiro*; Hosoya, Takaaki*; Kurihara, Kazuo; Niimura, Nobuo*; Yamada, Taro*
no journal, ,
no abstracts in English
Hattori, Takanori; Sano, Asami; Arima, Hiroshi*; Utsumi, Wataru; Nagai, Takaya*; Iitaka, Toshiaki*; Kagi, Hiroyuki*; Katayama, Yoshinori; Inoue, Toru*; Yagi, Takehiko*
no journal, ,
The PLANET is the new high-pressure neutron beamline now being constructed at the intense pulsed neutron source J-PARC. This beamline aims at revealing the effect of water on dynamics of the interior of the Earth and planets by using the neutron character that is sensitive to hydrogen. The most characteristic feature of this beamline is to possess the huge 6-axis press with the maximum load of 500 ton/axis, which can simultaneously generate high-pressure and high-temperature condition of 30 GPa and 2000 K. Coupled with the state-of-the-art techniques in neutron diffraction and radiography, the beamline offers the microscopic and macroscopic information of materials at high-PT condition. The construction was started in 2008/11 and the 80% of the construction has finished now. During the construction, we took many disasters. This paper introduces the process based on the SUGOROKU form.
Machida, Akihiko; Honda, Mitsunori*; Hattori, Takanori; Sano, Asami; Watanuki, Tetsu; Katayama, Yoshinori; Aoki, Katsutoshi; Komatsu, Kazuki*; Arima, Hiroshi*; Oshita, Hidetoshi*; et al.
no journal, ,
no abstracts in English