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Maekawa, Fujio; Harada, Masahide; Oikawa, Kenichi; Teshigawara, Makoto; Kai, Tetsuya; Meigo, Shinichiro; Oi, Motoki; Sakamoto, Shinichi; Takada, Hiroshi; Futakawa, Masatoshi; et al.
Nuclear Instruments and Methods in Physics Research A, 620(2-3), p.159 - 165, 2010/08
Times Cited Count：74 Percentile：97.56(Instruments & Instrumentation)The J-PARC 1-MW pulsed spallation neutron source JSNS was successfully launched on 30th of May 2008. To demonstrate the unique features of the moderator design and the neutronic performance of JSNS the neutron spectral intensity, absolute neutron flux, and time structure of the neutron pulse shapes etc have been measured using several neutron instruments since then. The measured energy spectra clearly revealed the feature of the para-hydrogen, as expected when designing the moderator. The measured neutron flux below 0.4 eV agreed with the corresponding design value within 
20%, thus suggesting that the JSNS design calculations to have been reliable. World-class high-resolution diffraction data could be recorded due to the suitability of design of the moderators and the instruments. Another world-class high-intensity neutron flux was also capable of being demonstrated due to the unique design of the large cylindrical coupled moderator.
Maekawa, Fujio; Oikawa, Kenichi; Harada, Masahide; Teshigawara, Makoto; Kai, Tetsuya; Kasugai, Yoshimi; Meigo, Shinichiro; Oi, Motoki; Futakawa, Masatoshi; Watanabe, Noboru*; et al.
Proceedings of 19th Meeting of the International Collaboration on Advanced Neutron Sources (ICANS-19) (CD-ROM), 8 Pages, 2010/07
Efforts have been made to characterize neutronic performance of JSNS. A NOBORU instrument was mainly used for this purpose while some other instruments were used when needed. The followings were confirmed. (1) Judging from a measured spectral shape, a para-hydrogen fraction in the hydrogen moderator was very close to unity as expected due to introduction of catalyst in a hydrogen circulation system. (2) Measured data for absolute spectral intensity and pulse shapes agreed very well with simulation calculations, and suggested adequacy of the neutron source designs. (3) The world's highest resolution of 0.035 % was recorded at the powder diffractometer SuperHRPD. (4) A total neutron flux of 3 
10
n/s/cm
was confirmed at the chopper instrument 4SEASONS when it was normalized to 1 MW. The flux is the world's highest among existing spallation neutron sources, and is comparable to fluxes at intense reactor sources even in time-averaged value.
Harada, Masahide; Oikawa, Kenichi; Oi, Motoki; Kai, Tetsuya; Sakai, Kenji; Maekawa, Fujio; Watanabe, Noboru*; Shinohara, Takenao; Takata, Shinichi
Proceedings of 19th Meeting of the International Collaboration on Advanced Neutron Sources (ICANS-19) (CD-ROM), 10 Pages, 2010/07
A neutron beam line NOBORU built at MLF in J-PARC is suitable for imaging experiments due to a large beam size, a short distance from the moderator to the sample position and an adequate experimental room. In order to evaluate suitability for the imaging experiments, we measured neutron spectral intensities and flux distributions at the sample position of NOBORU. We also measured those quantities with use of some filters, collimators and slits equipped on NOBORU. As preliminary experiments for imaging, we measured Bragg edge transmission of some alloys and resonance absorption of some elements. The result showed welded and non-welded areas in an alloy could be clearly distinguished by the Bragg edge transmission. It was also found that several elements in the sample could be distinguished clearly by the resonance absorption method. It could be concluded that NOBORU was very suitable for the imaging experiments at J-PARC.
Maekawa, Fujio; Oikawa, Kenichi; Harada, Masahide; Kai, Tetsuya; Meigo, Shinichiro; Kasugai, Yoshimi; Oi, Motoki; Sakai, Kenji; Teshigawara, Makoto; Hasegawa, Shoichi; et al.
Nuclear Instruments and Methods in Physics Research A, 600(1), p.335 - 337, 2009/02
Times Cited Count：42 Percentile：92.82(Instruments & Instrumentation)A neutron beam line (BL10) of JSNS, NOBORU, has been constructed in the Materials and Life Science Experimental Facility (MLF) at J-PARC. A primal mission of NOBORU is to study neutronic performance of JSNS. We will measure the memorable first neutron pulse of JSNS at the Day-one by using NOBORU, and then measure neutron pulse shape, spectrum, intensity distribution, etc. for facility diagnostics. Since NOBORU also has an aspect as a test port, it welcomes trial uses to develop innovative instruments. Trial experiments to demonstrate several innovative instruments at NOBORU are under planning.
Oikawa, Kenichi; Maekawa, Fujio; Harada, Masahide; Kai, Tetsuya; Meigo, Shinichiro; Kasugai, Yoshimi; Oi, Motoki; Sakai, Kenji; Teshigawara, Makoto; Hasegawa, Shoichi; et al.
Nuclear Instruments and Methods in Physics Research A, 589(2), p.310 - 317, 2008/05
Times Cited Count：54 Percentile：94.98(Instruments & Instrumentation)NOBORU, NeutrOn Beam-line for Observation and Research Use, has been constructed in the Materials and Life Science Facility (MLF) of J-PARC. NOBORU is designed to "Observe" a 1 MW Japan Spallation Neutron Source (JSNS), i.e., to study the neutronic performance of JSNS. NOBORU also will be used for "Research" activities, i.e., as a test port for R&D activities and trial users who have new ideas. In this paper, the design and application of NOBORU are described, and its expected performance is investigated by Monte Carlo simulations.
Kawamura, Makoto; Oi, Takao; Makino, Hitoshi; Umeda, Koji; Niizato, Tadafumi; Yasue, Kenichi; Kawachi, Susumu; Ishimaru, Tsuneari; Seo, Toshihiro; Ebina, Takanori*; et al.
JAEA-Review 2006-039, 60 Pages, 2007/01
JAEA-Review-2006-039.pdf:7.39MB
This report is to outline a 5-year plan of research and development (R&D) for performance assessment of potential effect of natural phenomena on a geological disposal of high-level radioactive waste in JAEA. In each research plan, objectives based on the necessity and the significance of the research plan are clarified in the section of "Objectives and the past progresses", with summarizing the progresses of H12: Project to establish the scientific and technical basis for HLW disposal in Japan (Second Progress Report), and H17: Development and management of the technical knowledge base for the geological disposal of HLW (H17 report). In addition, next five year plan is described in the section.
in JSNSMaekawa, Fujio; Oikawa, Kenichi; Harada, Masahide; Kai, Tetsuya; Meigo, Shinichiro; Kasugai, Yoshimi; Oi, Motoki; Sakai, Kenji; Teshigawara, Makoto; Hasegawa, Shoichi; et al.
Proceedings of 18th Meeting of the International Collaboration on Advanced Neutron Sources (ICANS-18) (CD-ROM), p.118 - 126, 2007/00
One of 23 neutron beam lines of JSNS, NOBORU, has been assigned to the Neutron Facility Group of JAEA. The primary mission of NOBORU is to investigate neutronic performance of JSNS while it can accommodate various trial research experiments. This paper describes an experimental program by using NOBORU mostly in an on-beam commissioning period of JSNS after the first proton beam acceptance in 2008. Topics for the primary mission to be studied are as follows; relationships between operating parameters of JSNS and neutronic performance, acquisition of beam parameters for users, confirmation of integrity in main components of JSNS, validation of neutronic designs, and research and development on measuring techniques. In addition, we are interested in radiography, introduction of a high-pressure instrument and eV neutron spectroscopy, and also welcome trial uses to bring out new research activities.
Teshigawara, Makoto; Harada, Masahide; Watanabe, Noboru; Kai, Tetsuya; Sakata, Hideaki*; Ikeda, Yujiro; Oi, Motoki*
JAERI-Conf 2001-002, p.835 - 847, 2001/03
no abstracts in English
Saito, Kenya*; Kakuta, Akio*; Oi, Noboru*; Nomata, Terumitsu*; Tominaga, Yasuo*; Okoshi, Yoshimi*; Kashibe, Shinji*; Ouchi, Atsuhiro*
PNC TJ4164 88-002VOL2, 24 Pages, 1988/05
PNC-TJ4164-88-002VOL2.pdf:1.53MB
None
Saito, Kenya*; Kakuta, Akio*; Oi, Noboru*; Nomata, Terumitsu*; Tominaga, Yasuo*; Okoshi, Yoshimi*; Kashibe, Shinji*; Ouchi, Atsuhiro*
PNC TJ4164 88-002VOL1, 60 Pages, 1988/05
PNC-TJ4164-88-002VOL1.pdf:3.72MB
None
Oikawa, Kenichi; Maekawa, Fujio; Harada, Masahide; Kai, Tetsuya; Sakai, Kenji; Meigo, Shinichiro; Kasugai, Yoshimi; Teshigawara, Makoto; Oi, Motoki; Kato, Takashi; et al.
no journal, ,
no abstracts in English
Oikawa, Kenichi; Maekawa, Fujio; Harada, Masahide; Kai, Tetsuya; Meigo, Shinichiro; Kasugai, Yoshimi; Oi, Motoki; Sakai, Kenji; Teshigawara, Makoto; Hasegawa, Shoichi; et al.
no journal, ,
Construction of NBORU at J-PARC was started in 2003 and completed in 2007, and NOBORU has been got ready to measure the first shot from the pulsed neutron beam from the JSNS. We got the day 1 of JSJS on May 30, 2008, and NOBORU succeeded in the observation of the first neutron shot at 14:25. We verified a basic neutron characteristic of JSNS from various perspectives using NOBORU through the commissioning period of May, June, and September. For example, (1) the neutron intensity and spectrum, (2) the neutron pulse shape, (3) the luminosity distribution of the moderator, etc.. Especially, obtained data of the neutron spectrum and the pulse shape that is the most important matter of the design validation of JSNS are, as far as the present statistics and current proton beam intensity, well agreed with that of the calculated values. These facts show that the design, production, and the installation of JSNS has been correctly performed with the aid of the computer simulations.
Maekawa, Fujio; Oikawa, Kenichi; Harada, Masahide; Kai, Tetsuya; Kasugai, Yoshimi; Oi, Motoki; Meigo, Shinichiro; Sakai, Kenji; Teshigawara, Makoto; Takada, Hiroshi; et al.
no journal, ,
no abstracts in English
Maekawa, Fujio; Harada, Masahide; Teshigawara, Makoto; Kai, Tetsuya; Oikawa, Kenichi; Oi, Motoki; Futakawa, Masatoshi; Watanabe, Noboru*
no journal, ,
