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Morishita, Takatoshi
JPS Conference Proceedings (Internet), 8, p.011006_1 - 011006_6, 2015/09
The displacement of the accelerator components induces the beam losses so that the alignment is important for the stable beam operation. The stability of the floor height became worth after the Tohoku earthquake in March 11th, 2011. The floor height is affected by the environmental conditions such as weather, earthquake, and so on. The degrees of these movements are identified by the monitoring system. By the usual earthquake, the deformation seems random and negligibly small. The heavy rain tilts the floor, however, which recovered gradually. The significant vertical deformation was observed by the long-term monitoring for more than months. Degree of this deformation is comparable to the surveyed results. Then, the slow movement dominates the vertical deformation of the J-PARC linac tunnel floor.
Oguri, Hidetomo; Okoshi, Kiyonori; Ikegami, Kiyoshi*; Yamazaki, Saishun; Takagi, Akira*; Koizumi, Isao; Ueno, Akira
JPS Conference Proceedings (Internet), 8, p.011009_1 - 011009_6, 2015/09
Kajimoto, Ryoichi; Nakamura, Mitsutaka; Inamura, Yasuhiro; Kamazawa, Kazuya*; Ikeuchi, Kazuhiko*; Iida, Kazuki*; Ishikado, Motoyuki*; Nakajima, Kenji; Harada, Masahide; Arai, Masatoshi
JPS Conference Proceedings (Internet), 8, p.036001_1 - 036001_6, 2015/09
Sn strand at cryogenic temperatureHarjo, S.; Kawasaki, Takuro; Hemmi, Tsutomu; Ito, Takayoshi*; Nakamoto, Tatsushi*; Aizawa, Kazuya
JPS Conference Proceedings (Internet), 8, p.031001_1 - 031001_5, 2015/09
Sako, Hiroyuki; J-PARC Heavy-ion Collaboration*
JPS Conference Proceedings (Internet), 8, p.022010_1 - 022010_6, 2015/09
Recently, a future heavy ion program has been discussed. The main goals of the program is to explore the QCD phase diagram in high baryon densities with heavy ion beams at 1-10 A GeV, as well as research of unstable nuclei up to 10 A MeV. In this work, we focus on the former. We study in-medium modifications of rho/omega/phi mesons decaying into dileptons, measure rare particles such as multi-strangeness hadrons, exotic hadrons, and hypernuclei. We have been designing a spectrometer with a solenoid spectrometer and a dipole spectrometer, which covers almost 4
acceptance, and identifies charged hadrons as well as electrons and muons. A heavy-ion acceleration scheme has been considered with a new heavy-ion linac and a new booster ring, which accelerate and inject heavy-ion beams into RCS. Then the beams are accelerated in MR.
Nakamura, Mitsutaka; Kawakita, Yukinobu; Kambara, Wataru; Aoyama, Kazuhiro; Kajimoto, Ryoichi; Nakajima, Kenji; Kawamura, Seiko; Ikeuchi, Kazuhiko*; Kikuchi, Tatsuya; Inamura, Yasuhiro; et al.
JPS Conference Proceedings (Internet), 8, p.036011_1 - 036011_6, 2015/09
The needs for inelastic neutron scattering experiments under the special sample environment such as strong magnetic field and high temperature are recently increasing. However, the unwanted scatterings originating from these devices affect the detection of weak inelastic signals. In order to overcome this problem we have developed an oscillating radial collimator specialized for the chopper spectrometer at Materials and Life Science Experimental Facility (MLF) in J-PARC. In this study, we will report the performances of newly-developed oscillating radial collimators both for 4SEASONS and AMATERAS.
Oikawa, Kenichi; Harada, Masahide; Shinohara, Takenao; Kai, Tetsuya; Oi, Motoki; Kiyanagi, Yoshiaki*
JPS Conference Proceedings (Internet), 8, p.036002_1 - 036002_5, 2015/09
RADEN, named after the Japanese decorative craft arts, is an energy-resolved neutron imaging instrument proposed to the Materials and Life Science Experimental Facility (MLF) at J-PARC. This instrument provides various imaging fields for not only conventional radiography/tomography, but also Bragg-edge, resonance absorption and polarized neutron with good energy resolution by means of Time-of-Flight method. Construction of the instrument at BL22 started in January 2013, and on-beam commissioning will be start in November 2014. To maximize flexibility of neutron brightness, beam divergence and field of view at the sample position, an original shutter block that has a single shutter insert was replaced by a new one with three inserts.
Su, Y. H.; Oikawa, Kenichi; Kawasaki, Takuro; Kai, Tetsuya; Shiota, Yoshinori*; Sato, Hirotaka*; Shinohara, Takenao; Tomota, Yo*; Harada, Masahide; Kiyanagi, Ryoji; et al.
JPS Conference Proceedings (Internet), 8, p.031015_1 - 031015_5, 2015/09
In this study, neutron imaging experiment was performed using NOBORU, BL10 of MLF at J-PARC. Four kinds of cast duplex stainless steel with ferrite and austenite microstructure were studied here, which were produced by different casting method at different temperature. Firstly, two-dimensional scintillation detector using wavelength-shifting fibers with pixel size of 0.52 mm 
0.52 mm and illuminated area 55 mm 55 mm was used for data collection. Then, measurement by Micro Pixel Chamber based neutron imaging detector having higher spatial resolution about 0.2 mm was conducted. Data analysis code RITS (Rietveld Imaging of Transmission Spectra) will be used for microstructure including crystalline phase, lattice strain, crystallite size, texture evaluation.
Harada, Masahide; Parker, J. D.*; Oikawa, Kenichi; Kai, Tetsuya; Shinohara, Takenao
JPS Conference Proceedings (Internet), 8, p.035002_1 - 035002_5, 2015/09
We found that Cadmium (Cd) was not only a suitable thermal neutron absorber as a poison material in a pulsed spallation neutron source, but also had a long life time with a small sacrifice in neutron intensities at an intense source. Therefore, we decided to use Cd as the poison material in the first moderator in JSNS/J-PARC. In the development stage of JSNS, canning of a Cd plate by an Al-alloy with the Cold Isostatic Pressing method failed and the Al-alloy cover of the Cd plate was broken. In order to correct the manufacturing process, we have to observe the inside of the sample to find the reason for failure. To investigation the inside of the canning Cd plate non-destructively, we applied the energy selective neutron imaging method. We measured the transmission of the canning Cd plate used by the micro-pixel chamber (
PIC) neutron detector at NOBORU (BL10) in JSNS. As a result, several vacancies could be found and the distribution of the amount of Cd could be also obtained.
Oi, Motoki; Sakai, Kenji; Watanabe, Akihiko; Akutsu, Atsushi; Meigo, Shinichiro; Takada, Hiroshi
JPS Conference Proceedings (Internet), 8, p.036007_1 - 036007_5, 2015/09
This paper reports on upgrading of the monitor and operation (MO) system for a general control system (GCS) of the Materials and Life science experimental Facility (MLF) at J-PARC. The MLF-GCS consists of programmable logic controllers (PLCs), operator interfaces (OPIs) for integral control and interlock systems, shared servers, and so on. It is controlling various components of the pulsed spallation neutron source such as a mercury target and hydrogen moderators. The MO system is used for monitoring, alarm notification and remote control from the MLF control room. The GCS has been working well as expected, but current MO system which consists of the OPIs and data servers based on iFix has some problems in view of sustainable maintenance because of its poor flexibility of supported OS and software version compatibility. To overcome the problems, we upgraded the MO system to be operated using the framework of EPICS, the OPI of Control System Studio (CSS) and the server software of Postgre SQL. This improves versatility of the MO system, enabling to run on various platforms such as Windows, Linux and Mac OS. At first, we made a prototype MO system, which processed 100 points of data and 5 operation screens and verified that the MO system functions correctly. Then we made full spec MO system which processes the data point of 7000 and operation screens of 130. It was operated in parallel with the current system to evaluate its performance with real data such as data transmission speed from PLCs, control functions from OPI, storage capability of servers and long-term reliability. As results, the new MO system achieved the communication speed of 2 Hz and its operability compatible to the current system. Now, we are operating and debugging it in comparison with the current system during the operating period as a preparation for the system replacement at the end of 2014.
ZrCuO
with incommensurate magnetic structureYasui, Yukio*; Igawa, Naoki; Kakurai, Kazuhisa
JPS Conference Proceedings (Internet), 8, p.034012_1 - 034012_6, 2015/09
Magnetic structure has been studied by using neutron diffraction for quasi one-dimensional quantum spin system LiZrCuO with CuO ribbon chains. The CuO ribbon system LiZrCuO exhibits the antiferromagnetic transition at T
7 K, however, the magnetic transition is not accompanied with ferroelectricity. At 3K, we observed magnetic superlattice reflections at Q = (0, k, l
) and (h, 0, l) (h, k and l = even) with 0.488 by the powder neutron diffraction. By the combined studies of neutron diffraction and magnetization data, the magnetic structure of LiZrCuO is proposed. On the bases of the obtained data, reasons for absence of ferroelectricity in LiZrCuO are discussed.
Ito, Takashi; Higemoto, Wataru; Ninomiya, Kazuhiko*; Kubo, Kenya*; Kawamura, Naritoshi*; Shimomura, Koichiro*
JPS Conference Proceedings (Internet), 8, p.036014_1 - 036014_5, 2015/09
Hiroi, Kosuke; Shinohara, Takenao; Hayashida, Hirotoshi*; Wada, Naohiro*; Oikawa, Kenichi; Harada, Masahide; Kai, Tetsuya; Arai, Masatoshi
JPS Conference Proceedings (Internet), 8, p.035001_1 - 035001_6, 2015/09
We have been developing a quantitative magnetic field imaging technique at J-PARC. Applying this method to observe a magnetic field in industrial products, it is necessary to extend this technique to the AC magnetic field driving at a frequency of commercial power supply (5060Hz). In this study, we attempted to measure an AC magnetic field quantitatively with the TOF method. Magnetic field imaging experiments were performed at the beam line of BL10 "NOBORU" in the Materials and Life science experimental Facility (MLF) of J-PARC. An AC magnetic field was produced by applying an AC electric current to a small solenoid coil. Polarization images were obtained under applying the AC field in the coil and wavelength dependence of polarization in a selected area was analyzed, in which polarization changes due to the neutron spin rotation were observed. By fitting the results with a model assuming that only the magnetic field inside the coil contributed to the neutron spin rotation, the amplitude of applied AC field was estimated to be 3.220.1410
A/m, which was corresponded to the designed value of 3.310A/m.
neutron diffraction experimentKawasaki, Takuro; Harjo, S.; Gong, W.; Aizawa, Kazuya; Iwahashi, Takaaki; Shi, Z.*; Li, J.*; Tomota, Yo*; Ung
r, T.*
JPS Conference Proceedings (Internet), 8, p.031009_1 - 031009_5, 2015/09
To evaluate the characteristics of the microstructure of materials, such as dislocation density, dislocation character and crystalline size, is as important as elastic strain in order to understand the mechanical properties of the materials. These characteristics can be obtained by analyzing the peak profile in X-ray or neutron diffraction patterns. Although high-penetrability of neutron enables direct observation of the characteristics inside bulky materials, not much research on the microstructure which uses neutron diffraction is available. In the present study, the dislocation characteristics of a martensitic steel during tensile deformation was investigated by in-situ neutron diffraction experiment using Engineering Material Diffractometer TAKUMI at BL19 of MLF, J-PARC and CMWP method. According as the strain increases, significant increasing of the correlation between the dislocations was observed though the increasing of dislocation density is not very much.
Takahashi, Hiroki; Kawase, Masato; Ouchi, Nobuo
JPS Conference Proceedings (Internet), 8, p.012020_1 - 012020_6, 2015/09
Segawa, Mariko; Oi, Motoki; Kai, Tetsuya; Shinohara, Takenao; Sato, Hirotaka*; Kureta, Masatoshi
JPS Conference Proceedings (Internet), 8, p.036006_1 - 036006_6, 2015/09
Sr
CuO by four-dimensional mapping of neutron cross-sections using the 4SEASONS chopper spectrometerWakimoto, Shuichi; Ikeuchi, Kazuhiko*; Arai, Masatoshi; Fujita, Masaki*; Kajimoto, Ryoichi; Kawamura, Sho*; Matsuura, Masato*; Nakajima, Kenji; Yamada, Kazuyoshi*
JPS Conference Proceedings (Internet), 8, p.034013_1 - 034013_6, 2015/09
Sakaguchi, Yoshifumi*; Asaoka, Hidehito; Uozumi, Yuki; Kawakita, Yukinobu; Ito, Takayoshi*; Kubota, Masato; Yamazaki, Dai; Soyama, Kazuhiko; Ailavajhala, M.*; Wolf, K.*; et al.
JPS Conference Proceedings (Internet), 8, p.031023_1 - 031023_6, 2015/09
We report recent results of time-resolved neutron reflectivity measurements for silver photo-diffusion into GeS
(x=0.20, 0.33, 0.40) films performed on BL17 (SHARAKU). It is well known that silver diffuses into Ge-chalcogenide layer by visible light exposure with a distinct diffusion front, where the silver concentration abruptly drops off. Using an event recording system at the Materials and Life Science Experimental Facility, neutron reflectivity profiles were collected with a time-resolution of 30 seconds in the shortest case. It was found from the measurements that a relatively stable Ag-rich phase in the reaction layer is firstly formed, and then, slower diffusion occurs at the interface between Ag-rich and Ag-poor layers. Fourier transform analysis showed that the position of the interface is essentially fixed. This result is in contrast to the previously reported model of silver diffusion that postulates a mechanism involving progression of the diffusion front. The results of the measurements on Ag/Ge-Se films performed on the INTER instrument at ISIS are also reported.
Hiromoto, Takeshi; Adachi, Motoyasu; Shibazaki, Chie; Schrader, T. E.*; Ostermann, A.*; Kuroki, Ryota
JPS Conference Proceedings (Internet), 8, p.033003_1 - 033003_6, 2015/09
T4 phage lysozyme (T4L) is an endoacetylmuramidase that degrades the murein of the bacterial cell wall by cleaving the 
-1,4-glycosidic bond between 
-acetylmuramic acid and -acetylglucosamine. We previously reported that the substitution of the catalytic Thr26 with the nucleophilic His converts the wild-type (WT) T4L from an inverting to a retaining glycosidase, in which the -configuration of the substrate is retained in the product. We also found that the Thr26His (T26H) mutant can catalyze a transglycosylation reaction more effectively than hydrolysis, although the WT-T4L has no transglycosidase activity. To clarify the role of the substituted His26 in transglycosylation and to investigate its relationship to the neighboring acidic residue Asp20 using neutron crystallography, a perdeuterated recombinant protein of the T26H mutant (d-T26H) was prepared for crystallization. The perdeuterated form was produced in 
cells cultured in deuterated-rich media. After purification, the d-T26H mutant was crystallized under deuterated conditions and grown to a volume of 0.12 mm using a macroseeding technique. A preliminary neutron-diffraction experiment at 100 K at the FRM II research reactor (Munich, Germany) gave diffraction spots of up to 2.8 
resolution after a 1.5 h exposure.
Tamura, Jun; Ao, Hiroyuki; Nemoto, Yasuo; Oguri, Hidetomo
JPS Conference Proceedings (Internet), 8, p.011011_1 - 011011_6, 2015/09
