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Journal Articles

Network system operation for J-PARC accelerators

Kamikubota, Norihiko*; Yamada, Shuei*; Sato, Kenichiro*; Kikuzawa, Nobuhiro; Yamamoto, Noboru*; Yoshida, Susumu*; Nemoto, Hiroyuki*

Proceedings of 16th International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS 2017) (Internet), p.1470 - 1473, 2018/01

no abstracts in English

Journal Articles

Operation status of J-PARC timing system and future plan

Kamikubota, Norihiko*; Kikuzawa, Nobuhiro; Tamura, Fumihiko; Yamamoto, Noboru*

Proceedings of 15th International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS 2015) (Internet), p.988 - 991, 2016/01

The beam commissioning of J-PARC started in November, 2006. Since then, the timing system of J-PARC accelerator complex has contributed stable beam operations of three accelerators: a 400-MeV linac (LI), a 3-GeV rapid cycling synchrotron (RCS), and a 50-GeV synchrotron (MR). The timing system handles two different repetition cycles: 25 Hz for LI and RCS, and 2.48-6.00 sec. for MR (MR cycle). In addition, the timing system is capable to provide beams to two different experimental facilities in single MR cycle: Material and Life Science Experimental Facility (MLF) and Neutrino Experimental Facility (NU), or, MLF and Hadron Experimental Facility (HD). Recently, a plan to introduce a new facility, Accelerator-Driven Transmutation Experimental Facility (ADS), around 2018, has been discussed. This paper reviews the 8-year operation experience of the J-PARC timing system, followed by a present perspective of upgrade studies.

Journal Articles

Highly efficient extraction separation of lanthanides using a diglycolamic acid extractant

Shimojo, Kojiro; Aoyagi, Noboru; Saito, Takumi*; Okamura, Hiroyuki; Kubota, Fukiko*; Goto, Masahiro*; Naganawa, Hirochika

Analytical Sciences, 30(2), p.263 - 269, 2014/02

 Times Cited Count:42 Percentile:86.73(Chemistry, Analytical)

Journal Articles

An X-ray diffraction study on a single rod outer segment from frog retina

Yagi, Naoto*; Matsuo, Tatsuhito; Ota, Noboru*

Journal of Synchrotron Radiation, 19(4), p.574 - 578, 2012/07

 Times Cited Count:1 Percentile:7.64(Instruments & Instrumentation)

X-ray diffraction patterns were recorded from isolated single rod outer segments of frog. The outer segments in Ringer's solution were exposed to a 6 $$mu$$m microbeam (15 keV) at the BL40XU beamline, SPring-8. The diffraction pattern demonstrated a remarkable regularity in the stacking and flatness of the disk membranes. The electron density profile calculated from the intensity of up to tenth-order reflections showed a pair of bilayers that comprise a disk membrane. The structure of the disk membrane and the changes in the profile on swelling generally agreed with previous reports. Radiation damage was significant with an irradiation of 5 $$times$$ 10$$^{5}$$ Gy which is much lower than the known damaging dose on proteins at the liquid-nitrogen temperature.

Journal Articles

Current status of a new polarized neutron reflectometer at the intense pulsed neutron source of the Materials and Life Science Experimental Facility (MLF) of J-PARC

Takeda, Masayasu; Yamazaki, Dai; Soyama, Kazuhiko; Maruyama, Ryuji; Hayashida, Hirotoshi; Asaoka, Hidehito; Yamazaki, Tatsuya; Kubota, Masato; Aizawa, Kazuya; Arai, Masatoshi; et al.

Chinese Journal of Physics, 50(2), p.161 - 170, 2012/04

Journal Articles

Aspect-ratio-dependent phase transitions and concentration fluctuations in aqueous colloidal dispersions of charged platelike particles

Yamaguchi, Daisuke; Miyamoto, Nobuyoshi*; Fujita, Takako*; Nakato, Teruyuki*; Koizumi, Satoshi; Ota, Noboru*; Yagi, Naoto*; Hashimoto, Takeji

Physical Review E, 85(1), p.011403_1 - 011403_15, 2012/01

 Times Cited Count:19 Percentile:75.27(Physics, Fluids & Plasmas)

Phase transition of aqueous colloidal dispersions of charged plate-like particles of niobate nanosheets were investigated as a function of the aspect ratio ($$r_{rm asp}$$) and particle volume concentration ($$theta$$$$_{rm P}$$) by small-angle neutron scattering and small-angle X-ray scattering. The results elucidated the following three pieces of evidence: (1) the macroscopic phase separation of the dispersions into an isotropic phase and a liquid crystalline phase (LC) under the condition of (a) varying $$r_{rm asp}$$ at a constant $$theta$$$$_{rm P}$$ = 0.01, and of (b) varying $$theta$$$$_{rm P}$$ (0.01 $$leq$$ $$theta$$$$_{rm P}$$ $$leq$$ 0.025) at a constant $$r_{rm asp}$$ = 2.5$$times$$10$$^{-3}$$. (2) the $$r_{rm asp}$$-induced phase transition of the LC phase from a nematic phase to a highly periodic layered phase upon increasing r under the condition (a). (3) the LC phase having remarkable concentration fluctuations of the particles which are totally unexpected for the conventional lyotropic molecular LC but which are anticipated to be general for the plate-like colloidal particles.

Journal Articles

Plan to develop overall-control system for 3GeV synchrotron accelerator

Kawase, Masato; Kikuzawa, Nobuhiro; Takayanagi, Tomohiro; Kamikubota, Norihiko*; Yamamoto, Noboru

Proceedings of 8th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.574 - 578, 2011/08

J-PARC has been shifting to stable beam operation phase for the experimental facility, and the beam commissioning is going to be needed of 3 GeV Synchrotron Accelerator (RCS) after 400 MeV upgrade of Linear Accelerator (LINAC). In order to achieve more stable and safety beam commissioning, it is necessary to implement of control and monitor using machine interface for prevention of human error. We plan to develop the ideal application and high performance data acquisition system for the beam commissioning. This report shows problems of this control system and the required performance for overall-control system of RCS.

Journal Articles

Current status of the control system for J-PARC accelerator complex

Yoshikawa, Hiroshi; Sakaki, Hironao; Sako, Hiroyuki; Takahashi, Hiroki; Shen, G.; Kato, Yuko; Ito, Yuichi; Ikeda, Hiroshi*; Ishiyama, Tatsuya*; Tsuchiya, Hitoshi*; et al.

Proceedings of International Conference on Accelerator and Large Experimental Physics Control Systems (ICALEPCS '07) (CD-ROM), p.62 - 64, 2007/10

J-PARC is a large scale facility of the proton accelerators for the multi-purpose of scientific researches in Japan. This facility consists of three accelerators and three experimental stations. Now, J-PARC is under construction, and LINAC is operated for one year, 3GeV synchrotron has just started the commissioning in this October the 1st. The completion of this facility will be next summer. The control system of accelerators established fundamental performance for the initial commissioning. The most important requirement to the control system of this facility is to minimize the activation of accelerator devices. In this paper, we show that the performances of each layer of this control system have been achieved in the initial stage.

JAEA Reports

An Inspection standard of graphite for the High Temperature Engineering Test Reactor

Toyota, Junji; Iyoku, Tatsuo; Ishihara, Masahiro; Takikawa, Noboru; Shiozawa, Shusaku

JAERI-M 91-102, 61 Pages, 1991/07

JAERI-M-91-102.pdf:1.49MB

no abstracts in English

Oral presentation

Results of safety research on radioactive waste disposal (H13-17)

Miyahara, Kaname; Nakatsuka, Noboru; Uchida, Masahiro; Shigeta, Naotaka; Ota, Kunio; Nohara, Tsuyoshi; Semba, Takeshi

no journal, , 

The results of five issues for safety research on radioactive waste from 2001 to 2005 introduced in the sectional committee of the safety research on radioactive waste. The five issues are as follows, (1) Study on a basic strategy for post-generic safety assessment, (2) Study on long-term stability for geological environment, (3) Methodology development for the characterization of crystalline rock, (4) Establishment of techniques for characterization of sedimentary formations, (5) Natural analogue study on geological environment.

Oral presentation

Comparison of the mutagenesis effect between ion beams and $$gamma$$ ray; Guinea grass and sorghum

Nakagawa, Hitoshi*; Inafuku, Masashi*; Kusaba, Noboru*; Yamaguchi, Hiroyasu*; Morishita, Toshikazu*; Morita, Ryohei*; Nishimura, Minoru*; Hoeman, S.*; Yokota, Yuichiro; Hase, Yoshihiro; et al.

no journal, , 

no abstracts in English

Oral presentation

Applied-electric-field dependence of charge ordered phase in the trianglular-lattice system LuFe$$_{2}$$O$$_{4}$$

Hayakawa, Hironori*; Kubota, Masato*; Oishi, Daisuke*; Akahama, Yuji*; Matsuo, Yoji*; Ikeda, Naoshi*; Kambe, Takashi*; Kimizuka, Noboru*; Yoshii, Kenji

no journal, , 

We have investigated the change of charge-ordered state in LuFe$$_{2}$$O$$_{4}$$ caused by an applied electric field. The application of the field above a threshold led to a drastic decrease in resistivity; this behavior corresponds to the change of charge-ordered structure observed using synchrotron radiation. More details will be shown at the conference.

Oral presentation

Liquid crystalline phases in colloidal suspensions of K$$_{4}$$Nb$$_{6}$$O$$_{17}$$ nanosheets

Yamaguchi, Daisuke; Miyamoto, Nobuyoshi*; Fujita, Takako*; Nakato, Teruyuki*; Koizumi, Satoshi; Yagi, Naoto*; Ota, Noboru*; Hashimoto, Takeji

no journal, , 

Formation of lyotropic liquid crystalline (LC) phase was observed on a charged colloidal platelike particle system yielded from layered niobate crystal of K$$_{4}$$Nb$$_{6}$$O$$_{17}$$. Firstly, the effect of mean lateral size (D) of the particle was examined at a constant volume fraction of the particle (.fai.) where a LC phase coexisted with an isotropic (I) phase. The coexisting LC phase was distinctly transformed from nematic to lamellar (L) as D was diminished. Secondly, the .fai. dependence of the interparticle distance (d) was examined along the I-L transition. In the coexistence region, d varied with .fai. and held nearly the same value between I and L phases, apparently deviating from gas-liquid condensation-type phase separation.

Oral presentation

Interparticle distance between the sheet-like niobate particles in the lamellar-forming colloidal dispersion

Yamaguchi, Daisuke; Miyamoto, Nobuyoshi*; Fujita, Takako*; Nakato, Teruyuki*; Koizumi, Satoshi; Ota, Noboru*; Yagi, Naoto*; Hashimoto, Takeji

no journal, , 

The lyotropic lamellar phase in colloidal suspension has been well established in the recent work of the exfoliated inorganic phosphatoantimonate crystal. Here we report the other distinct lamellar phase formed in the colloidal suspension of hexaniobate "nanosheet", which is coexistent with an isotropic phase. This colloidal system clearly shows that not only the degree of orientational order but also that of positional order are quite different between upper isotropic phase and bottom lamellar phase. However, a definite interparticle correlation does exist in the isotropic phase and the difference in the mean interparticle distance (d) between lamellar and isotropic phases turned out rather small. All those pieces of experimental evidence suggest that the coexisting isotropic-lamellar phases is not attributed to the sedimentation of the nanosheet particles by the gravity but arisen as a result of ordering process of nanosheet particles by getting over the random thermal force of Brownian motion.

Oral presentation

A New polarized neutron reflectometer installed at the intense pulsed neutron source of Materials and Life Science Experimental Facility (MLF) of J-PARC opening to International users

Takeda, Masayasu; Yamazaki, Dai; Soyama, Kazuhiko; Maruyama, Ryuji; Hayashida, Hirotoshi; Asaoka, Hidehito; Yamazaki, Tatsuya; Kubota, Masato; Aizawa, Kazuya; Inamura, Yasuhiro; et al.

no journal, , 

Oral presentation

SANS and SAXS observation on the layered-structure-forming nanosheet colloid

Yamaguchi, Daisuke; Miyamoto, Nobuyoshi*; Fujita, Takako*; Nakato, Teruyuki*; Koizumi, Satoshi; Ota, Noboru*; Yagi, Naoto*; Hashimoto, Takeji*

no journal, , 

The lyotropic lamellar phase in colloidal suspension has been well established in the recent work of the exfoliated inorganic phosphatoantimonate crystal. Here we report the other distinct lamellar phase formed in the colloidal suspension of hexaniobate nanosheet, which is coexistent with an isotropic phase. It is clear that not only the degree of orientational order but also that of positional order are quite different between upper isotropic phase and bottom lamellar phase. However, a definite interparticle correlation does exist in the isotropic phase and the difference in the mean interparticle distance between lamellar and isotropic phases turned out rather small. All those pieces of experimental evidence suggest that the coexisting isotropic-lamellar phases is not attributed to the sedimentation of the nanosheet particles by the gravity but arisen as a result of ordering process of nanosheet particles by getting over the random thermal force of Brownian motion.

Oral presentation

Current status of the new polarized neutron reflectometer (SHARAKU) at J-PARC, and prospects for study on multilayers

Kubota, Masato; Takeda, Masayasu; Yamazaki, Dai; Hayashida, Hirotoshi; Maruyama, Ryuji; Soyama, Kazuhiko; Asaoka, Hidehito; Yamazaki, Tatsuya; Sakasai, Kaoru; To, Kentaro; et al.

no journal, , 

no abstracts in English

Oral presentation

Present status of a new polarized neutron reflectometer SHARAKU (BL17) at J-PARC MLF

Takeda, Masayasu; Yamazaki, Dai; Hayashida, Hirotoshi; Maruyama, Ryuji; Soyama, Kazuhiko; Kubota, Masato; Asaoka, Hidehito; Yamazaki, Tatsuya; Sakasai, Kaoru; To, Kentaro; et al.

no journal, , 

no abstracts in English

Oral presentation

A New polarized neutron reflectometer (SHARAKU) at the intense pulsed neutron source of the Materials and Life Science Experimental Facility of J-PARC

Takeda, Masayasu; Yamazaki, Dai; Soyama, Kazuhiko; Maruyama, Ryuji; Hayashida, Hirotoshi; Asaoka, Hidehito; Yamazaki, Tatsuya; Kubota, Masato; Aizawa, Kazuya; Arai, Masatoshi; et al.

no journal, , 

Oral presentation

Conceptual design of small-sized high temperature gas-cooled reactor system for electricity generation and district heating

Kasuga, Shoji*; Kubota, Kenichi*; Okamoto, Futoshi*; Maekawa, Isamu*; Furihata, Noboru*; Saito, Masanao*; Kido, Yuji*; Ohashi, Hirofumi; Tachibana, Yukio; Kunitomi, Kazuhiko

no journal, , 

Conceptual design of a small-sized HTGR for electricity generation and district heating has been conducted by JAEA with support of Japanese vendors: Toshiba Corporation, Fuji Electric, Kawasaki Heavy Industries, Nuclear Fuel Industries, Shimizu Corporation, and Marubeni Utility Services. System design as well as nuclear design of the first core of HTR50S using the same CFPs as the HTTR has been performed and the nuclear design shows upgraded performance of the reactor compared with the HTTR.

33 (Records 1-20 displayed on this page)