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Journal Articles

New applications of ion beams to material, space, and biological science and engineering

Fukuda, Mitsuhiro; Ito, Hisayoshi; Oshima, Takeshi; Saido, Masahiro; Tanaka, Atsushi

Charged Particle and Photon Interactions with Matter, p.813 - 859, 2003/11

An ion beam has been widely applied to a variety of research fields of materials, space, and bio-sciences. Notable results, which were hard to obtain in applications of a $$gamma$$ ray and an electron beam, have been produced by the ion beam application. Ion beams interacting with matter have such superior properties as highly localized ionization and excitation, production of secondary particles, implantation of different atoms, and nuclear transmutation of constituent atoms. Skillful utilization of the ion beam properties makes remarkable progress in creation of new materials and precise investigation of matters. The ion beam irradiation research facility, TIARA, was established in 1993 at JAERI for extensive applications of ion beams. An accelerator complex provides light to heavy ion beams with a broad energy range from keV to GeV. Various ion beam technologies pioneering the ion beam applications have been developed at TIARA. In this paper, new applications of accelerated ion beams to material, space, and biological science and engineering carried out mainly at TIARA are reviewed.

Journal Articles

Wall conditioning and experience of the carbon-based first wall in JT-60U

Masaki, Kei; Yagyu, Junichi; Arai, Takashi; Kaminaga, Atsushi; Kodama, Kozo; Miya, Naoyuki; Ando, Toshiro; Hiratsuka, Hajime; Saido, Masahiro

Fusion Science and Technology (JT-60 Special Issue), 42(2-3), p.386 - 395, 2002/09

 Times Cited Count:8 Percentile:49.76(Nuclear Science & Technology)

The wall conditioning of JT-60U consists of the 300$$^{circ}$$C baking, He-TDC, He-GDC, tokamak discharge cleaning and boronization. Using these methods, total pressure of the vacuum vessel reached finally 10$$^{-6}$$ $$sim$$ 10$$^{-5}$$ Pa. The oxygen impurity was decreased to $$sim$$0.5%. The experience with the carbon-based first wall showed that taper shaping is effective to reduce the local heat concentration to the tile edges. The observed poloidal asymmetric deposition of carbon on the divertor region implies that the carbon impurity produced in the outer divertor contributes to the deposition on the inner divertor. In 1992 and 1993, the B$$_{4}$$C converted CFC tiles were installed in the outer divertor to reduce chemical sputtering of CFC tiles and oxygen impurity. The reduction was successfully demonstrated with the B$$_{4}$$C converted CFC tiles. In order to understand the tritium behavior in JT-60U, tritium in the first wall and the exhaust gas were measured. The estimated tritium inventory in the first wall was $$sim$$50% of the generated tritium.

Journal Articles

The Kinetics of Fe and Ca for the development of radiation-induced apoptosis by micro-PIXE imaging

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:12.95(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 $$^{60}$$Co $$gamma$$ 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.

Journal Articles

Report on the nuclear technology mission for the seminar on the technology and application of accelerators

Saido, Masahiro

Hoshasen To Sangyo, (81), p.55 - 57, 1999/03

no abstracts in English

Journal Articles

Deuterium retention of DIII-D DiMES sample

Yamaguchi, Y.*; *; Hino, Tomoaki*; Masaki, Kei; Saido, Masahiro; Ando, Toshiro; D.G.Whyte*; C.Wong*

Journal of Nuclear Materials, 266-269, p.1257 - 1260, 1999/00

 Times Cited Count:20 Percentile:81.17(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

The Irradiation facilities for the radiation tolerance testing of semiconductor devices for space use in Japan

Saido, Masahiro; Fukuda, Mitsuhiro; Arakawa, Kazuo; Tajima, Satoshi; Sunaga, Hiromi; Yotsumoto, Keiichi; Kamiya, Tomihiro; Tanaka, Ryuichi; Hirao, Toshio; Nashiyama, Isamu; et al.

Proceedings of 1999 IEEE Nuclear and Space Radiation Effects Conference, p.117 - 122, 1999/00

no abstracts in English

Journal Articles

Gas desorption properties of tungsten coated graphite materials

*; *; *; Hino, Tomoaki*; Ogiwara, Norio; Yagyu, Junichi; Saido, Masahiro

Vacuum, 53(1-2), p.309 - 312, 1999/00

 Times Cited Count:2 Percentile:13.68(Materials Science, Multidisciplinary)

no abstracts in English

JAEA Reports

Design and installation of W-shaped divertor in JT-60U

; Masaki, Kei; ; Morimoto, Masaaki*; *; Sakurai, Shinji; *; Saido, Masahiro; *; *; et al.

JAERI-Tech 98-049, 151 Pages, 1998/11

JAERI-Tech-98-049.pdf:6.45MB

no abstracts in English

Journal Articles

Inspection of JT-60 W-shaped divertor after the initial operation

Masaki, Kei; ; ; Morimoto, Masaaki*; *; Hosogane, Nobuyuki; Sakurai, Shinji; Saido, Masahiro

Purazuma, Kaku Yugo Gakkai-Shi, 74(9), p.1048 - 1053, 1998/09

no abstracts in English

Journal Articles

Stress analysis for the crack observation in cooling channels of the toroidal field coils in JT-60U

Tamai, Hiroshi; Kikuchi, Mitsuru; Arai, Takashi; ; *; Saido, Masahiro; Kimura, Toyoaki; Nagami, Masayuki; Shimizu, Masatsugu; *; et al.

Fusion Engineering and Design, 38(4), p.429 - 439, 1998/00

 Times Cited Count:3 Percentile:32.94(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Development of a compact W-shaped pumped divertor in JT-60U

Sakurai, Shinji; Hosogane, Nobuyuki; Masaki, Kei; ; ; *; *; Shimizu, Katsuhiro; Akino, Noboru; Miyo, Yasuhiko; et al.

Fusion Engineering and Design, 39-40, p.371 - 376, 1998/00

 Times Cited Count:5 Percentile:45.37(Nuclear Science & Technology)

no abstracts in English

Journal Articles

The First inspection of JT-60U W-shaped divertor after high power operation

Masaki, Kei; ; Morimoto, Masaaki*; ; *; Hosogane, Nobuyuki; Saido, Masahiro

Fusion Technology 1998, p.67 - 70, 1998/00

no abstracts in English

Journal Articles

Installation of the W-shaped divertor in JT-60U

; ; Masaki, Kei; Hosogane, Nobuyuki; Sakurai, Shinji; Morimoto, Masaaki*; Miyo, Yasuhiko; Hiratsuka, Hajime; Akino, Noboru; *; et al.

Proc. of 17th IEEE/NPSS Symposium Fusion Engineering (SOFE'97), 2, p.365 - 368, 1998/00

no abstracts in English

Journal Articles

The Present status of irradiation facilities at JAERI-Takasaki

Saido, Masahiro; Fukuda, Mitsuhiro; Arakawa, Kazuo; Tajima, Satoshi; Sunaga, Hiromi; Yotsumoto, Keiichi; Tanaka, Ryuichi

Proceedings of 3rd International Workshop on Radiation Effects on Semiconductor Devices for Space Application, p.183 - 188, 1998/00

no abstracts in English

Journal Articles

Vacuum leak test technique of JT-60

Kaminaga, Atsushi; Arai, Takashi; ; *; Saido, Masahiro

Shinku, 41(10), p.846 - 850, 1998/00

no abstracts in English

Journal Articles

Development of B$$_{4}$$C-carbon fiber composite ceramics as plasma facing materials in nuclear fusion reactor, part 3; Heat resistance evaluation by electron beam irradiation and by in situ plasma discharge in JT-60

*; Saido, Masahiro; Nakamura, Kazuyuki; Akiba, Masato; ; Dairaku, Masayuki; *; *; *; Goto, Yoshitaka*

Nihon Seramikkusu Kyokai Gakujutsu Rombunshi, 105(1228), p.1091 - 1098, 1997/12

 Times Cited Count:1 Percentile:19.15(Materials Science, Ceramics)

no abstracts in English

Journal Articles

Properties of thin boron coatings formed during deuterated-boronization in JT-60

Yagyu, Junichi; Ogiwara, Norio; Saido, Masahiro; Okabe, Tomokazu; Hiratsuka, Hajime; Miyo, Yasuhiko; Naramoto, Hiroshi; Yamamoto, Shunya; Takeshita, Hidefumi; Aoki, Yasushi; et al.

Journal of Nuclear Materials, 241-243, p.579 - 584, 1997/00

 Times Cited Count:15 Percentile:75.44(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Development of B$$_{4}$$C-carbon fiber composite ceramics as plasma facing materials in nuclear fusion reactor, 3; Heat resistance evaluation by electron beam irradiation and by in situ plasma discharge in JT-60

Jimbo, Ryutaro*; Saido, Masahiro; Nakamura, Kazuyuki; Akiba, Masato; ; Dairaku, Masayuki; *; *; *; *

Journal of the Ceramic Society of Japan, International Edition, 105, p.1179 - 1187, 1997/00

no abstracts in English

Journal Articles

Tritium retention in graphite inner wall of JT-60U

Masaki, Kei; ; Ando, Toshiro; Saido, Masahiro; Shimizu, Masatsugu; Hayashi, Takumi; Okuno, Kenji

Fusion Engineering and Design, 31, p.181 - 187, 1996/00

 Times Cited Count:19 Percentile:82.71(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Effects of plasma behavior on in-vessel components in JT-60 operation

Hiratsuka, Hajime; ; ; Arai, Takashi; Masaki, Kei; Neyatani, Yuzuru; Yagyu, Junichi; Kaminaga, Atsushi; Saido, Masahiro

Fusion Technology 1996, 0, 4 Pages, 1996/00

no abstracts in English

52 (Records 1-20 displayed on this page)