Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Matsuyama, Tsugufumi*; Suzuki, Tatsuhiko*; Migita, Yukie; Ishii, Kota*; Ueno, Satoshi*
Hoken Butsuri, 52(3), p.226 - 230, 2017/09
no abstracts in English
Sakoda, Akihiro; Kataoka, Noriaki*; Ueno, Satoshi*; Matsuyama, Tsugufumi*
Hoken Butsuri, 51(3), p.191 - 195, 2016/09
This article briefly overviews two recent meetings (December 2015 and July 2016) of the Young Researchers Association and the Students Association of the Japan Health Physics Society.
Ishizawa, Akihiro*; Idomura, Yasuhiro; Imadera, Kenji*; Kasuya, Naohiro*; Kanno, Ryutaro*; Satake, Shinsuke*; Tatsuno, Tomoya*; Nakata, Motoki*; Nunami, Masanori*; Maeyama, Shinya*; et al.
Purazuma, Kaku Yugo Gakkai-Shi, 92(3), p.157 - 210, 2016/03
The high-performance computer system Helios which is located at The Computational Simulation Centre (CSC) in The International Fusion Energy Research Centre (IFERC) started its operation in January 2012 under the Broader Approach (BA) agreement between Japan and the EU. The Helios system has been used for magnetised fusion related simulation studies in the EU and Japan and has kept high average usage rate. As a result, the Helios system has contributed to many research products in a wide range of research areas from core plasma physics to reactor material and reactor engineering. This project review gives a short catalogue of domestic simulation research projects. First, we outline the IFERC-CSC project. After that, shown are objectives of the research projects, numerical schemes used in simulation codes, obtained results and necessary computations in future.
Pikuz, T.*; Faenov, A.*; Matsuoka, Takeshi*; Matsuyama, Satoshi*; Yamauchi, Kazuto*; Ozaki, Narimasa*; Albertazzi, B.*; Inubushi, Yuichi*; Yabashi, Makina*; Tono, Kensuke*; et al.
Scientific Reports (Internet), 5, p.17713_1 - 17713_10, 2015/12
Times Cited Count:36 Percentile:88.1(Multidisciplinary Sciences)Nuga, Hideo; Matsuyama, Akinobu; Yagi, Masatoshi; Fukuyama, Atsushi*
Plasma and Fusion Research (Internet), 10, p.1203006_1 - 1203006_2, 2015/01
Matsuyama, Akinobu; Yagi, Masatoshi; Kagei, Yasuhiro; Nakajima, Noriyoshi*
Nuclear Fusion, 54(12), p.123007_1 - 123007_14, 2014/12
Times Cited Count:11 Percentile:48.78(Physics, Fluids & Plasmas)Yagi, Masatoshi; Matsuyama, Akinobu; Miyato, Naoaki; Takizuka, Tomonori*
Contributions to Plasma Physics, 54(4-6), p.363 - 367, 2014/06
Times Cited Count:0 Percentile:0.01(Physics, Fluids & Plasmas)Yagi, Masatoshi; Miyato, Naoaki; Matsuyama, Akinobu; Takizuka, Tomonori*
Plasma and Fusion Research (Internet), 9, p.3403030_1 - 3403030_4, 2014/04
Matsuyama, Akinobu; Yagi, Masatoshi; Kagei, Yasuhiro*
JPS Conference Proceedings (Internet), 1, p.015037_1 - 015037_4, 2014/03
no abstracts in English
Matsuyama, Akinobu; Yagi, Masatoshi
Plasma and Fusion Research (Internet), 8, p.1403170_1 - 1403170_6, 2013/12
Nobuta, Yuji*; Yamauchi, Yuji*; Hino, Tomoaki*; Akamaru, Satoshi*; Hatano, Yuji*; Matsuyama, Masao*; Suzuki, Satoshi; Akiba, Masato
Fusion Engineering and Design, 87(7-8), p.1070 - 1073, 2012/08
Times Cited Count:2 Percentile:17.83(Nuclear Science & Technology)Harada, Satoshi*; Ehara, Shigeru*; Ishii, Keizo*; Sato, Takahiro; Yamazaki, Hiromichi*; Matsuyama, Shigeo*; Kamiya, Tomihiro
JAEA-Review 2011-043, JAEA Takasaki Annual Report 2010, P. 89, 2012/01
Harada, Satoshi*; Tamakawa, Yoshiharu*; Ishii, Keizo*; Tanaka, Akira*; Sato, Takahiro; Matsuyama, Shigeo*; Yamazaki, Hiromichi*; Kamiya, Tomihiro; Sakai, Takuro; Arakawa, Kazuo; et al.
Nuclear Instruments and Methods in Physics Research B, 189(1-4), p.437 - 442, 2002/04
Times Cited Count:1 Percentile:12.51(Instruments & Instrumentation)To study the interactions between the induction of radiation-induced apoptosis and trace elements kinetics, human leukemia cells were irradiated in vitro by Co rays, after which the cells were evaluated for the detection of apoptosis and trace element imaging was carried out. The frequency of apoptosis was obtained by microscopic assay using TUNEL staining. The trace element distribution in the cell was determined by micro-PIXE. In the early phase of apoptosis, the maximum level of Fe accumulation was observed in the cell stroma. In the mid to end phase, Fe accumulation was diminished, and instead, Ca accumulation increased and Zn decreased in the nucleus. There appear to be two steps for the development of apoptosis: (1) the signaling from cell stroma to nucleus by Fe or an Fe-containing enzyme; and (2) the degeneration of the nucleus by Ca-dependent enzyme, and release of Zn from digested nucleus. Those strong accumulations may be new markers for apoptosis.
Chiba, Satoshi; *; *; *; Matsuyama, Shigeo*; Shibata, Keiichi; Iwamoto, Osamu; A.J.Koning*; G.M.Hale*; M.B.Chadwick*; et al.
Physical Review C, 58(4), p.2205 - 2216, 1998/10
Times Cited Count:16 Percentile:65.84(Physics, Nuclear)no abstracts in English
*; *; Matsuyama, Shigeo*; Chiba, Satoshi; *; Shibata, Keiichi; Iwamoto, Osamu; A.J.Koning*; G.M.Hale*; M.B.Chadwick*
JAERI-Research 98-032, 28 Pages, 1998/06
no abstracts in English
Harada, Satoshi*; Ehara, Shigeru*; Ishii, Keizo*; Yamazaki, Hiromichi*; Matsuyama, Shigeo*; Sato, Takahiro; Kamiya, Tomihiro; Sera, Koichiro*; Saito, Yoshihiro*
no journal, ,
no abstracts in English
Harada, Satoshi*; Ehara, Shigeru*; Ishii, Keizo*; Yamazaki, Hiromichi*; Matsuyama, Shigeo*; Sato, Takahiro; Koka, Masashi; Kamiya, Tomihiro
no journal, ,
no abstracts in English
Yagi, Masatoshi; Kagei, Yasuhiro*; Matsuyama, Akinobu
no journal, ,
In this presentation, the simulation results on the loss rate for runaway electrons in ITER plasmas will be reported. For this purpose, runaway electron orbit following code is extended such that up-down anti-symmetric equilibrium can be handled as well as up-down symmetric equilibrium. The orbit of runaway electron is followed using drift Hamiltonian model in Boozer co-ordinates. The analytical model for perturbed magnetic field is introduced to simulate magnetic turbulence during disruption phase. The time variation of canonical angular momentum of relativistic electron in the toroidal direction is analyzed in the case with magnetic island. In addition, Poincare plot of particle orbitis done. The preliminary result indicates that the runaway electron is well confined under magnetic perturbation for ITER parameters.
Matsuyama, Akinobu; Yagi, Masatoshi; Kagei, Yasuhiro*
no journal, ,
Relativistic orbit-following code ETC-Rel is developed to study runaway electron dynamics in magnetic turbulence during tokamak disruptions. The code is applied to up-down asymmetric equilibrium like ITER, where relativistic drift equations are formulated on the basis of the Euler-Lagrange equations in Boozer coordinates especially taking into account loop voltage. For ITER-scale machines, since the ratio of poloidal gyroradius to the device size is much smaller than unity, the distortion of electron orbit with respect to the field-line trajectories is negligible. It indicates that enhancement of magnetic stochasticity due to overlapping of magnetic islands is essential for the degradation of runaway electron confinement. Simulations are used to calculate the mean-square displacement of test particles in magnetic turbulence, showing nondiffusive nature of the radial transport of runaway electrons.
Matsuyama, Akinobu; Yagi, Masatoshi; Kagei, Yasuhiro*
no journal, ,
no abstracts in English