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Cs supply from rivers to coastal waters off Fukushima on the Cs behavior in seabed sedimentIkenoue, Tsubasa; Nakanishi, Takahiro; Shimadera, Hikari*; Kawamura, Hideyuki; Kondo, Akira*
E3S Web of Conferences (Internet), 530, p.02005_1 - 02005_10, 2024/05
The accident at the Fukushima Daiichi Nuclear Power Plant (FDNPP) caused a radioactive contamination in seabed sediment. The Cs supply from rivers could be an important process for the long-term behavior of Cs in seabed sediment. In this study, a ten-year simulation of the Cs behavior in seabed sediment was conducted using an oceanic dispersion model combined with a prediction model of Cs behavior in land and river. In the waters north of FDNPP, the simulation results suggested that the Cs supply from rivers had a great impact on the concentrations in coastal sediment due to the initial low concentrations in seabed sediment and the large supply of Cs from rivers. In the waters near FDNPP and south of FDNPP, the simulation results suggested that the impact of the Cs supply on the temporal variation of Cs concentration in coastal sediment was relatively small due to the large initial adsorption from seawater. Overall, these results indicated that Cs supply from rivers had an impact on the spatiotemporal distribution of Cs concentrations in seabed sediment on a decadal time scale and the impact was especially great in the waters north of FDNPP.
Watanabe, Masao; Nojiri, Hiroyuki*; Ito, Shinichi*; Kawamura, Seiko; Kihara, Takumi*; Masuda, Takatsugu*; Sahara, Takuro*; Soda, Minoru*; Takahashi, Ryuta
JPS Conference Proceedings (Internet), 25, p.011024_1 - 011024_5, 2019/03
Recently, neutron scattering experiments have been rapidly progressed under high magnetic field. In the J-PARC, proto-type compact pulse magnet system with the power supply, the coil and the sample stick has been developed. Basic specifications of the power supply are as follows; maximum charged voltage with capacitor is 2 kV, maximum current is 8 kA, repetition rate is a pulse per several minutes and pulse duration is several msec. Maximum magnetic field in the coil is more than 30 Tesla. The sample stick is designed for Orange-Cryostat. In this presentation, We report the details of the pulsed magnet system and the performance of it on neutron scattering experiments at MLF beam line (HRC).
Takayanagi, Tomohiro; Hayashi, Naoki; Ueno, Tomoaki*; Horino, Koki; Okabe, Kota; Kinsho, Michikazu; Irie, Yoshiro*
Proceedings of 6th International Particle Accelerator Conference (IPAC '15) (Internet), p.2908 - 2910, 2015/06
The new injection bump power supply for the shift bump (SB) magnet of the beam injection system at the J-PARC (Japan Proton Accelerator Research Complex) 3-GeV RCS (Rapid-Cycling Synchrotron) has been developed and manufactured. The power capacity of the new power supply demand doubling with the injection beam energy upgrading of the LIANC (Linear Accelerator) from 181 MeV to 400 MeV. Furthermore, the low ripple noise on the output current was required to prevent the occurrence of the resonation between the excitation magnetic field and the RF shield loop covered the ceramics duct at the magnet. The power supply newly adopted a capacitor commutation method to form the trapezoid waveform pattern (bump waveform). This paper reports characteristic about the new shift bump power supply.
Zito, P.*; Lampasi, A.*; Novello, L.*; Matsukawa, Makoto; Shimada, Katsuhiro; Portesine, M.*; Fasce, F.*; Cinarelli, D.*; Dorronsoro, A.*; Vian, D.*
Proceedings of IEEE 15th International Conference on Environment and Electrical Engineering (IEEE-EEEIC 2015), p.156 - 160, 2015/06
Watanabe, Kazuhiro; Kashiwagi, Mieko; Kawashima, Shuichi*; Ono, Yoichi*; Yamashita, Yasuo*; Yamazaki, Choji*; Hanada, Masaya; Inoue, Takashi; Taniguchi, Masaki; Okumura, Yoshikazu; et al.
Nuclear Fusion, 46(6), p.S332 - S339, 2006/06
Times Cited Count：33 Percentile：71.74(Physics, Fluids & Plasmas)no abstracts in English
Watanabe, Kazuhiro; Ando, Yasunori*
Purazuma, Kaku Yugo Gakkai-Shi, 81(10), p.792 - 797, 2005/10
no abstracts in English
Shimada, Katsuhiro; Omori, Yoshikazu; Furukawa, Hiroshi*; Terakado, Tsunehisa; Matsukawa, Makoto; Kurihara, Kenichi
Proceedings of International Conference on Electrical Engineering 2004 (ICEE 2004), p.777 - 781, 2004/00
We developed a new coil current control system for a power supply that consists of a synchronous generator and diode rectifiers. Test results are reported for the toroidal field coil power supply of JT-60, a world-class tokamak-type fusion device. This coil current control system has been designed to improve the control flexibility of the plasma discharge, and to introduce new functions. A state feedback control method is adopted to control coil current. Limit functions for the generator field current, the generator output voltage, and the toroidal field coil voltage have been added to the original coil current control system. Moreover, the abnormal state detection function of a coil is implemented for safety. The developed new intelligent control system has been tested and its performance was confirmed.
Kato, Takashi; Nakajima, Hideo; Isono, Takaaki; Hamada, Kazuya; Kawano, Katsumi; Sugimoto, Makoto; Nunoya, Yoshihiko; Koizumi, Norikiyo; Matsui, Kunihiro; Oshikiri, Masayuki*; et al.
Teion Kogaku, 36(6), p.315 - 323, 2001/06
no abstracts in English
Watanabe, Kazuhiro; Higa, Osamu*; Kawashima, Shuichi*; Okumura, Yoshikazu; Ono, Yoichi*; Tanaka, Masanobu*
JAERI-Tech 2000-033, p.72 - 0, 2000/03
JAERI-Tech-2000-033.pdf:2.72MB
no abstracts in English
Shinozaki, Shinichi; Shimono, Mitsugu; Terakado, Masayuki; Anno, Katsuto; Hiranai, Shinichi; Ikeda, Yoshitaka; Ikeda, Yukiharu; Imai, Tsuyoshi; Kasugai, Atsushi; Moriyama, Shinichi; et al.
Proceedings of the 18th IEEE/NPSS Symposium on Fusion Engineering (SOFE '99), p.403 - 406, 1999/10
no abstracts in English
Tsuneoka, Masaki; Imai, Tsuyoshi; E.Bowles*; I.Benfatto*; ;
Fusion Engineering and Design, 45(2), p.197 - 207, 1999/00
Times Cited Count：1 Percentile：13.00(Nuclear Science & Technology)no abstracts in English
Watanabe, Kazuhiro; ; ; ;
Review of Scientific Instruments, 69(12), p.4136 - 4141, 1998/12
Times Cited Count：32 Percentile：86.10(Instruments & Instrumentation)no abstracts in English
Watanabe, Kazuhiro; Higa, Osamu*; Kawashima, Shuichi*; Ohara, Yoshihiro; Okumura, Yoshikazu; Ono, Yoichi*; Tanaka, Masanobu*;
JAERI-Tech 97-034, 106 Pages, 1997/07
no abstracts in English
Tsuneoka, Masaki; Fujita, Hideo*; Sakamoto, Keishi; Kasugai, Atsushi; Imai, Tsuyoshi; Nagashima, Takashi; ; ; ; ; et al.
Fusion Engineering and Design, 36(4), p.461 - 469, 1997/00
Times Cited Count：23 Percentile：83.86(Nuclear Science & Technology)no abstracts in English
Matsukawa, Makoto; Aoyagi, Tetsuo; Miura, Yushi
Proc. of Power Conversion Conf. -Nagaoka 1997, 1, p.457 - 462, 1997/00
no abstracts in English
Watanabe, Kazuhiro; Ito, Takao*; Matsuoka, Mamoru
Purazuma, Kaku Yugo Gakkai-Shi, 69(10), p.1229 - 1241, 1993/10
no abstracts in English
; Sato, Osamu; ;
Nucl. Eng. Des., 136, p.211 - 217, 1992/00
Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)no abstracts in English
Kato, Takashi; Yoshida, Kiyoshi; ; Okawa, Yoshinao
JAERI-M 91-123, 59 Pages, 1991/08
no abstracts in English
; Sato, Osamu; ;
Proc. for the Seminar on 10th Int. Conf. SMiRT, p.VI.6.1 - VI.6.8, 1989/00
no abstracts in English
; ; ; ;
JAERI-M 8511, 63 Pages, 1979/10
no abstracts in English
