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Nishimori, Nobuyuki; Nagai, Ryoji; Matsuba, Shunya; Hajima, Ryoichi; Yamamoto, Masahiro*; Miyajima, Tsukasa*; Honda, Yosuke*; Uchiyama, Takashi*; Iijima, Hokuto*; Kuriki, Masao*; et al.
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.174 - 178, 2014/06
no abstracts in English
Suguro, Toshiyasu; Nishikawa, Yoshiaki*; Watahiki, Takashi*; Kagawa, Akio; Iijima, Kazuki
JAEA-Technology 2010-048, 32 Pages, 2011/03
JAEA-Technology-2010-048.pdf:0.89MB
Cementitious materials are considered to be necessary for the construction of TRU waste repository. The cement additives are used for cements and concretes in order to provide their fluidity. Many kinds of cement additives contain organic compounds which may increase radionuclide solubility by complex formation. Therefore, it is important to obtain the solubility data with cement additives for safety assessment of TRU waste disposal. In this work, two types of cement additives, such as sodium formaldehyde acid polymer and poly carboxylic acid polymer which are expected to be applied to the TRU waste disposal system, are selected. Since the chemical condition of the repository is considered to be reducing, the authors carried out batch-type experiments of plutonium solubility under reducing (Na
SO
added as reducant) and anoxic condition ([O] 
1 ppm). Other experimental conditions are (1)initial plutonium concentration; 10
M, (2) temperature; 298
5 K, (3)experimental period; 7, 14, 28 and 56 days and (4) molecular weight of cement additives; without fractionation 
5,000 and 
5,000. The plutonium concentration in the absence of the cement additives was in the order of 10
mol dm
, while, those in the presence of cement additives were two or three orders of magnitude higher. Additionally, low molecular weight fraction of cement additives brought relatively higher plutonium concentration than high molecular weight fraction.
Yamamoto, Masahiro*; Uchiyama, Takashi*; Miyajima, Tsukasa*; Honda, Yosuke*; Sato, Kotaro*; Matsuba, Shunya*; Saito, Yoshio*; Kobayashi, Masanori*; Kurisu, Hiriki*; Hajima, Ryoichi; et al.
Proceedings of 7th Annual Meeting of Particle Accelerator Society of Japan (DVD-ROM), p.717 - 720, 2010/08
A 500-kV photocathode DC electron gun which can supply the beam of a low emittance and a high average current has been developed in collaboration with KEK, JAEA, Hiroshima Univ., Nagoya Univ. and Yamaguchi Univ. The vacuum of the gun chamber has to be lower Extreme High Vacuum for maintain cathode-life time. A titanium chamber and new material of ceramic were employed to reduce outgassing rate. The result of outgassing rate of the gun chamber is described in this report.
Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.
Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05
Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.
Yamamoto, Masahiro*; Honda, Yosuke*; Miyajima, Tsukasa*; Uchiyama, Takashi*; Kobayashi, Masanori*; Muto, Toshiya*; Matsuba, Shunya*; Sakanaka, Shogo*; Sato, Kotaro*; Saito, Yoshio*; et al.
Proceedings of 6th Annual Meeting of Particle Accelerator Society of Japan (CD-ROM), p.860 - 862, 2009/08
A newly 500 kV electron gun (2nd - 500 kV gun) for an ERL light source is designed at KEK. A new concept and state of-the-art technologies of vacuum system, ceramic insulators, high voltage power supply, photocathode and preparation system will be employed. The details are described in this report.
Sakanaka, Shogo*; Ago, Tomonori*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; Harada, Kentaro*; Hiramatsu, Shigenori*; Honda, Toru*; et al.
Proceedings of 11th European Particle Accelerator Conference (EPAC '08) (CD-ROM), p.205 - 207, 2008/06
Future synchrotron light sources based on the energy-recovery linacs (ERLs) are expected to be capable of producing super-brilliant and/or ultra-short pulses of synchrotron radiation. Our Japanese collaboration team is making efforts for realizing an ERL-based hard X-ray source. We report recent progress in our R&D efforts.
; Iijima, Takashi;
Journal of Nuclear Science and Technology, 41(2), p.183 - 195, 2004/02
Times Cited Count：10 Percentile：55.72(Nuclear Science & Technology)None
Otani, Tsukasa; Iijima, Takashi; Shiratori, Yoshitake
Journal of Nuclear Science and Technology, 40(11), p.959 - 969, 2003/11
Times Cited Count：5 Percentile：36.81(Nuclear Science & Technology)None
Iijima, Takashi; ;
Chikyu Kankyo To Shingata Genshiryoku Puranto Ni Kansuru Kokusai Kaigi (GENES4/ANP2003), 0 Pages, 2003/00
None
; ; Iijima, Takashi
Proceedings of 11th International Conference on Nuclear Engineering (ICONE-11) (CD-ROM), 0 Pages, 2003/00
None
Shimans; Iijima, Takashi;
A Symposium of Reactor Surveillance and Diagnostics (SMORN 8), 0 Pages, 2002/00
None
Iijima, Takashi; ;
Dai-13-Kai Kantaiheiyo Genshiryoku Kaigi 2002, 0 Pages, 2002/00
None
Shimans; Iijima, Takashi;
Proceedings of 10th International Conference on Nuclear Engineering (ICONE-10), 0 Pages, 2002/00
None
Iijima, Takashi
8TH ZITTAU FUZZY COLLOQUIUM 2000, 0 Pages, 2001/00
None
Shimans; Iijima, Takashi;
Saikuru Kiko Giho, (15), 0 Pages, 2001/00
None
Kamimura, Katsuichiro; Iijima, Takashi*; Yano, Soichiro
PNC TN8410 95-296, 186 Pages, 1995/05
None
Iijima, Takashi; Nakajima, Yoshiaki; Sakurai, Naoto
PNC TN3410 92-014, 45 Pages, 1992/06
A fuzzy logic control system (flcs) has been developed to enhance an ability of reactor feedwater control of the fugen n.p.s. the first stage: A simulation study, and the second stage: development of prototype system which had an on-line support function were completed. Validation tests for the prototype system have been performed since oct. 1989 and results of the tests indicated the potential of the flcs. As the last stage of development, an on-line practical flcs is being developed and it will be introduced to the feedwater control system of the fugen in jul.1992.
Kawai, Masayoshi*; Iijima, Shungo*; Nakagawa, Tsuneo; Nakajima, Yutaka; Sugi, Teruo; Watanabe, Takashi*; Matsunobu, Hiroyuki*; *; *
Journal of Nuclear Science and Technology, 29(3), p.195 - 213, 1992/03
no abstracts in English
