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Saha, P. K.; Okabe, Kota; Nakanoya, Takamitsu; Yoshimoto, Masahiro; Shobuda, Yoshihiro; Harada, Hiroyuki; Tamura, Fumihiko; Okita, Hidefumi; Hatakeyama, Shuichiro; Moriya, Katsuhiro; et al.
Proceedings of 19th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1 - 5, 2023/01
Yamamoto, Kazami; Kinsho, Michikazu; Hayashi, Naoki; Saha, P. K.; Tamura, Fumihiko; Yamamoto, Masanobu; Tani, Norio; Takayanagi, Tomohiro; Kamiya, Junichiro; Shobuda, Yoshihiro; et al.
Journal of Nuclear Science and Technology, 59(9), p.1174 - 1205, 2022/09
Times Cited Count：6 Percentile：84.97(Nuclear Science & Technology)In the Japan Proton Accelerator Research Complex, the purpose of the 3 GeV rapid cycling synchrotron (RCS) is to accelerate a 1 MW, high-intensity proton beam. To achieve beam operation at a repetition rate of 25 Hz at high intensities, the RCS was elaborately designed. After starting the RCS operation, we carefully verified the validity of its design and made certain improvements to establish a reliable operation at higher power as possible. Consequently, we demonstrated beam operation at a high power, namely, 1 MW. We then summarized the design, actual performance, and improvements of the RCS to achieve a 1 MW beam.
Yamamoto, Kazami; Hatakeyama, Shuichiro; Saha, P. K.; Moriya, Katsuhiro; Okabe, Kota; Yoshimoto, Masahiro; Nakanoya, Takamitsu; Fujirai, Kosuke; Yamazaki, Yoshio; Suganuma, Kazuaki
EPJ Techniques and Instrumentation (Internet), 8(1), p.9_1 - 9_9, 2021/07
The 3 GeV Rapid Cycling Synchrotron at the Japan Proton Accelerator Research Complex supplies a high-intensity proton beam for neutron experiments. Various parameters are monitored to achieve a stable operation, and it was found that the oscillations of the charge-exchange efficiency and cooling water temperature were synchronized. We evaluated the orbit fluctuations at the injection point using a beam current of the injection dump, which is proportional to the number of particles that miss the foil and fail in the charge exchange, and profile of the injection beam. The total width of the fluctuations was approximately 0.072 mm. This value is negligible from the user operation viewpoint as our existing beam position monitors cannot detect such a small signal deviation. This displacement corresponds to a 1.63
10
variation in the dipole magnetic field. Conversely, the magnetic field variation in the L3BT dipole magnet, which was estimated by the temperature change directly, is 4.0810. This result suggested that the change in the cooling water temperature is one of the major causes of the efficiency fluctuation.
Shibata, Masahiro; Sawada, Atsushi; Tachi, Yukio; Makino, Hitoshi; Wakasugi, Keiichiro; Mitsui, Seiichiro; Kitamura, Akira; Yoshikawa, Hideki; Oda, Chie; Ishidera, Takamitsu; et al.
JAEA-Research 2014-030, 457 Pages, 2015/03
JAEA-Research-2014-030.pdf:199.23MB
JAEA and NUMO have conducted a collaborative research work which is designed to enhance the methodology of repository design and post-closure performance assessment in preliminary investigation stage. With regard to (1) study on rock suitability in terms of hydrology, based on some examples of developing method of hydro-geological structure model, acquired knowledge are arranged using the tree diagram, and model uncertainty and its influence on the evaluation items were discussed. With regard to (2) study on scenario development, the developed approach for "defining conditions" has been reevaluated and improved from practical viewpoints. In addition, the uncertainty evaluation for the effect of use of cementitious material, as well as glass dissolution model, was conducted with analytical evaluation. With regard to (3) study on setting radionuclide migration parameters, based on survey of precedent procedures, multiple-approach for distribution coefficient of rocks was established, and the adequacy of the approach was confirmed though its application to sedimentary rock and granitic rock. Besides, an approach for solubility setting was developed including the procedure of selection of solubility limiting solid phase. The adequacy of the approach was confirmed though its application to key radionuclides.
Nohara, Tsuyoshi; Umeda, Koji; Sasao, Eiji; Asamori, Koichi; Hanamuro, Takahiro; Moriya, Toshifumi*; Nakatsuka, Noboru
JAEA-Research 2007-087, 102 Pages, 2008/02
JAEA-Research-2007-087.pdf:35.58MB
The Japanese islands are located in the tectonically active Circum-Pacific Mobile Belt. As a result, Japan has a high frequency of earthquakes and eruptions. Special consideration is given to the long-term stability of the geological environment, taking into account volcanism, faulting, uplift, denudation, climatic change and sea-level change in Japan. Development of research/prediction technologies for geotectonic events has been carried out to evaluate the long-term stability of the geological environment in Japan. Until fiscal year 2005, to confirm existence of phenomena that have a influence on geological disposal system (e.g. active fault or Quarternary volcanoes) and to confirm that there was not the trace that the phenomena occurred in the past and to predict/evaluate possibility of the phenomena, development of the research/prediction techniques for geotectonic events (e.g. Research techniques for earthquake source faults, Research techniques for detecting magmas and high-temperature fluids, Three-dimensional landform development simulator) were carried out. This report describes our efforts of these technologies based on its R&D program until fiscal year 2005.
Uedono, Akira*; Ito, Hisayoshi; Oshima, Takeshi; Aoki, Yasushi; Yoshikawa, Masahito; Nashiyama, Isamu; Okumura, Hajime*; Yoshida, Sadafumi*; *; *; et al.
Japanese Journal of Applied Physics, Part 1, 35(12A), p.5986 - 5990, 1996/12
no abstracts in English
Sekine, Toshiaki; Izumo, Mishiroku; Matsuoka, Hiromitsu; Kobayashi, Katsutoshi; ; Osa, Akihiko; Koizumi, Mitsuo; Motoishi, Shoji; Hashimoto, Kazuyuki; ; et al.
Proc. of the 5th Int. Workshop on Targetry and Target Chemistry, 0, p.347 - 352, 1994/00
no abstracts in English
C-labeled carboxylic acidsG.Ferro-Flores*; ; Sakamoto, Fuminori; Matsuoka, Hiromitsu; *
Journal of Radioanalytical and Nuclear Chemistry, Letters, 175(3), p.219 - 228, 1993/00
no abstracts in English
; Motoishi, Shoji
Proc. of the 3rd Asian Symp. on Research Reactor, 8 Pages, 1991/00
no abstracts in English
; Hashimoto, Kazuyuki
Nihon Genshiryoku Gakkai-Shi, 32(7), p.680 - 683, 1990/07
no abstracts in English
C-Labeled Kanechlor-300,-400,-500 and -600Moriya, Takashi; ; ;
JAERI-M 8071, 17 Pages, 1979/01
no abstracts in English
C
with high specific activityMoriya, Takashi; ;
Radioisotopes, 27(5), p.263 - 265, 1978/05
no abstracts in English
C-labeled 2,4,2',5'-tetrachlorobiphenylMoriya, Takashi
Journal of Labelled Compounds and Radiopharmaceuticals, 14(4), p.625 - 631, 1978/04
Times Cited Count：3no abstracts in English
Hoizumi, Kiyoshi; Moriya, Takashi
J.Labelled Compd., 10(3), p.499 - 508, 1974/03
Times Cited Count：7Starting with benzene-U-C, biphenyl-U-C was synthesized in two steps in approximately 65% yield. Then two kinds of polychlorinated biphenyls-U-C. The yield was more than 35% based on benzene-U-C consumed.
Isotope News, (4), p.18 - 20, 1972/00
no abstracts in English
Hanamuro, Takahiro; Nohara, Tsuyoshi; Umeda, Koji; Moriya, Toshifumi; Nakatsuka, Noboru
no journal, ,
Geoscientific research is performed as a basis of the research and development on the geological disposal technology of high-level radioactive waste in the Tono Geoscience Center, JAEA. In this seminar, we report on the current status of the research on long-term stability of the geological environment among research topics set by the geoscientific research.
derived from SOM decompositionMoriya, Koichi; Moriizumi, Jun*; Yamazawa, Hiromi*; Iida, Takao*; Koarashi, Jun; Atarashi-Andoh, Mariko
no journal, ,
Stable carbon isotopic ratios in soil organic matter (SOM) and CO derived from SOM decomposition were measured for two forests with different vegetation. The results showed the followings in both forests: (1) older SOM in deeper soil layer had higher 
C isotopic ratios (
C), (2) CO derived from SOM decomposition showed higher C than the original SOM. These results probably suggest that the stable carbon isotopic ratios change with its decomposition, due to the isotopic discrimination and the variation of the SOM compositions that have different isotopic ratios.
