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-wave magnet with commensurate spin helixYamada, Rinsuke*; Birch, M. T.*; Baral, P. R.*; Okumura, Shun*; Nakano, Ryota*; Gao, S.*; Ezawa, Motohiko*; Nomoto, Takuya*; Masell, J.*; Ishihara, Yuki*; et al.
Nature, 646(8086), p.837 - 842, 2025/10
Fedkin, M. V.*; Shin, Y. K.*; Dasgupta, N.*; Yeon, J.*; Zhang, W.*; van Duin, D.*; Van Duin, A. C. T.*; Mori, Kento*; Fujiwara, Atsushi*; Machida, Masahiko; et al.
Journal of Physical Chemistry A, 123(10), p.2125 - 2141, 2019/03
Times Cited Count：80 Percentile：96.88(Chemistry, Physical)no abstracts in English
Li, T.*; Garg, U.*; Liu, Y.*; Marks, R.*; Nayak, B. K.*; Madhusudhana Rao, P. V.*; Fujiwara, Mamoru*; Hashimoto, Hisanobu*; Nakanishi, Kosuke*; Okumura, Shun*; et al.
Physical Review C, 81(3), p.034309_1 - 034309_11, 2010/03
Times Cited Count：121 Percentile：97.62(Physics, Nuclear)
lattice antiferromagnet KCr
(OD)
(SO
)
Inami, Toshiya; Morimoto, T.*; Nishiyama, Masahide*; Maegawa, Satoru*; Oka, Yoshio*; Okumura, H.*
Physical Review B, 64(5), p.054421_1 - 054421_6, 2001/08
Times Cited Count：34 Percentile：80.80(Materials Science, Multidisciplinary)no abstracts in English
Okumura, Susumu; Arakawa, Kazuo; Fukuda, Mitsuhiro; Nakamura, Yoshiteru; Yokota, Wataru; Ishimoto, Takayuki*; Kurashima, Satoshi; Ishibori, Ikuo; Nara, Takayuki; Agematsu, Takashi; et al.
AIP Conference Proceedings 600, p.330 - 332, 2001/00
Frequent corrections of the magnetic field of the JAERI AVF cyclotron were required for keeping a beam current constant during long time operation. We observed correlation between the magnetic field and the temperature of the cyclotron magnet yoke by measuring the magnetic field with an NMR probe and the temperature with platinum resistance thermometers. The unstable phenomenon of a cyclotron beam was induced by temperature change in the magnet yoke caused mainly by thermal conduction from the main coil. To restrain the thermal conduction to the yoke, we have inserted temperature controlled copper plates between the yoke and the main coil. In addition, a temperature control system of the cooling water of the trim coils has been installed independent of the total cooling system for controlling the pole tip temperature. An optimum condition of the temperature control systems for stabilizing the magnetic field has been investigated.
Okumura, Susumu; Kurashima, Satoshi; Ishimoto, Takayuki*; Yokota, Wataru; Arakawa, Kazuo; Fukuda, Mitsuhiro; Nakamura, Yoshiteru; Ishibori, Ikuo; Nara, Takayuki; Agematsu, Takashi; et al.
Proceedings of 13th Symposium on Accelerator Science and Technology, p.283 - 285, 2001/00
no abstracts in English
Inoue, Takashi; Shibata, Keiichiro*; E.DiPietro*; Fujiwara, Yukio; R.S.Hemsworth*; E.Hodgson*; Iida, Hiromasa; A.Krylov*; P.L.Mondino*; Okumura, Yoshikazu; et al.
Fusion Technology 1998, 1, p.411 - 414, 1998/00
no abstracts in English
T.Henkel*; ; ; I.Koutzarov*; Okumura, Hajime*; Yoshida, Sadafumi*; Oshima, Takeshi
Mat. Res. Soc. Symp. Proc., 512, p.163 - 168, 1998/00
no abstracts in English
/Fe
equilibrium in a candidate glass for immobilization of high level nuclear wasteOhashi, S.*; Okumura, T.*; Kawamura, Kazuhiro; Miyamoto, Yoichi; Iwase, Masanori*
High Temperature Materials and Processes, 16(3), p.169 - 172, 1997/00
None
Agematsu, Takashi; Arakawa, Kazuo; Okumura, Susumu; Nakamura, Yoshiteru; Yokota, Wataru; Nara, Takayuki; Fukuda, Mitsuhiro; Ishibori, Ikuo; ; Tachikawa, T.*
Proc. of the 9th Symp. on Accelerator Science and Technology, p.65 - 67, 1993/00
no abstracts in English
Yokota, Wataru; Nara, Takayuki; Arakawa, Kazuo; Nakamura, Yoshiteru; Fukuda, Mitsuhiro; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; Tachikawa, T.*; ; et al.
Proceedings of 13th International Conference on Cyclotrons and Their Applications, p.336 - 339, 1993/00
no abstracts in English
Arakawa, Kazuo; Nakamura, Yoshiteru; Yokota, Wataru; Fukuda, Mitsuhiro; Nara, Takayuki; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; ; Tanaka, Ryuichi; et al.
Proceedings of 13th International Conference on Cyclotrons and Their Applications, p.119 - 122, 1993/00
no abstracts in English
; ; Tachikawa, T.*; Agematsu, Takashi; Okumura, Susumu; Arakawa, Kazuo
Proceedings of 13th International Conference on Cyclotrons and Their Applications, p.644 - 647, 1993/00
no abstracts in English
Yokota, Wataru; Fukuda, Mitsuhiro; Arakawa, Kazuo; Nakamura, Yoshiteru; Nara, Takayuki; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; Tachikawa, T.*; ; et al.
Proceedings of 13th International Conference on Cyclotrons and Their Applications, p.581 - 584, 1993/00
no abstracts in English
Tachikawa, T.*; ; ; ; Nakamura, Yoshiteru; Yokota, Wataru; Fukuda, Mitsuhiro; Kamiya, Tomihiro; Agematsu, Takashi; Nara, Takayuki; et al.
Proceedings of the International Conference on Evolution in Beam Applications, p.270 - 274, 1992/00
no abstracts in English
Yokota, Wataru; Ishibori, Ikuo; Okumura, Susumu; Agematsu, Takashi; Fukuda, Mitsuhiro; Nara, Takayuki; Kamiya, Tomihiro; Nakamura, Yoshiteru; Arakawa, Kazuo; Tachikawa, T.*; et al.
Proc. of the 8th Symp. on Accelerator Science and Technology, p.70 - 72, 1991/00
no abstracts in English
Arakawa, Kazuo; Nakamura, Yoshiteru; Yokota, Wataru; Fukuda, Mitsuhiro; Kamiya, Tomihiro; Nara, Takayuki; Agematsu, Takashi; Okumura, Susumu; Ishibori, Ikuo; Tanaka, Ryuichi; et al.
Proc. of the 8th Symp. on Accelerator Science and Technology, p.34 - 36, 1991/00
no abstracts in English
Hiraguchi, Atsuki; Zheng, X.*; Underwood, T. R.*; Kobayashi, Keita; Yamaguchi, Akiko; Itakura, Mitsuhiro; Machida, Masahiko; Rosso, K. M.*; Bourg, I. C.*; Okumura, Masahiko
no journal, ,
The migration behavior of radionuclides in clay minerals used as buffer material must be clarified for the long-term safety of geological disposal of high-level radioactive waste. The recent development of supercomputers enables us to perform large-scale classical molecular dynamics (MD) simulations to evaluate the adsorption properties of cation to clay minerals. We evaluated the free-energy profiles of cesium adsorption from mesopore to the interlayer of Na-montmorillonite by classical MD on a supercomputer. We found that the free-energy profiles of cesium adsorption depend on the interlayer distance of the Na-montmorillonite and mesopore salinity in the water system. In the presentation, we also discuss the distribution and diffusion coefficients of cesium ions.
Hiraguchi, Atsuki; Zheng, X.*; Underwood, T. R.*; Kobayashi, Keita; Yamaguchi, Akiko; Itakura, Mitsuhiro; Machida, Masahiko; Rosso, K. M.*; Bourg, I. C.*; Okumura, Masahiko
no journal, ,
In order to evaluate the long-term safety of geological disposal of high-level radioactive waste, it is necessary to understand the migration behavior of radionuclides in clay minerals used as buffer materials. In this study, the difference in the diffusion behavior of cesium and sodium ions in Na-montmorillonite is analyzed by evaluating the free energy using classical molecular dynamics simulations.
Hiraguchi, Atsuki; Zheng, X.*; Underwood, T. R.*; Kobayashi, Keita; Yamaguchi, Akiko; Itakura, Mitsuhiro; Machida, Masahiko; Rosso, K. M.*; Bourg, I. C.*; Okumura, Masahiko
no journal, ,
The migration behavior of radionuclides in clay minerals used as buffer material must be clarified for the long-term safety of geological disposal of high-level radioactive waste. We can investigate diffusion/adsorption behavior of cesium ion and sodium ion in clay minerals and water systems at molecular scale using molecular dynamics simulation on a supercomputing system. In this study, we evaluated the free energy profiles of cesium and sodium ions adsorption to the interlayer of Na-montmorillonite from bulk water in mesopore. As a result, we found that the minimum of free energy profiles of these cations locates in the interlayer of Na-montmorillonite, and the minimum of free energy profile of cesium is lower than that of sodium. This result shows that the affinity of cesium ion to Na-montmorillonite is stronger than that of sodium ion. Moreover, we confirmed that the affinities of both cations to Na-montmorillonite decrease with salinity increase, and these cations maintain their adsorption mechanism. In the presentation, we discuss layer charge and layer size dependence on the free energy profiles of these cations.
