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JAEA Reports

The Development of the boroncoating device for the JFT-2M

Yamamoto, Masahiro*; Okano, Fuminori; Tsuzuki, Kazuhiro; Ogawa, Hiroaki; Suzuki, Sadaaki; Shibata, Takatoshi

JAERI-Tech 2005-061, 11 Pages, 2005/09

JAERI-Tech-2005-061.pdf:0.94MB

Ferritic steel plates were installed in the JFT-2M vacuum vessel to conduct "the Advanced Material Tokamak Experiments (AMTEX)". A coating device with tri-methyl-bron(TMB)was developed to coat the ferritic steel surface with boron, since the ferritic steel is easy to rust and also has a property to absorb much impurity in the surface. The TMB gas used in the device was diluted with helium gas to 1% for ensuring workers themselves against the toxicity of the TMB. The uniformity and stability of the coated layer have been confirmed through sample tests with a microscope, whose samples had been set in the tokamak vacuum vessel. The coating thickness measured with X-ray photoelectron emission spectroscopy was roughly 130nm. In the plasma experiments after the boron coating, radiation loss in the plasma decreased to 1/3, and oxygen impurity also decreased to 1/10 compared to without the boron coating.

Journal Articles

Tempering treatment effect on mechanical properties of F82H steel doped with boron and nitrogen

Okubo, Nariaki; Wakai, Eiichi; Matsukawa, Shingo; Tanigawa, Hiroyasu; Sawai, Tomotsugu; Jitsukawa, Shiro; Onuki, Somei*

Materials Transactions, 46(8), p.1779 - 1782, 2005/08

 Times Cited Count:1 Percentile:82.49(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Effect of heat treatments on mechanical properties and microstructures of 8Cr-2W(F82H) steel doped with boron or boron and nitrogen

Wakai, Eiichi; Sato, Michitaka*; Okubo, Nariaki; Sawai, Tomotsugu; Shiba, Kiyoyuki; Jitsukawa, Shiro

Nippon Kinzoku Gakkai-Shi, 69(6), p.460 - 464, 2005/06

 Times Cited Count:1 Percentile:82.49(Metallurgy & Metallurgical Engineering)

no abstracts in English

Journal Articles

Evidence for a hard gap and Wigner lattice in heavily boron-doped synthetic diamond

Sudo, Tomoko*; Ohashi, Kazutoshi*; Sato, Toshimaro*; Ota, Eiji*; Okayasu, Satoru; Sugai, Hiroyuki

Physical Review B, 71(4), p.045211_1 - 045211_7, 2005/01

 Times Cited Count:1 Percentile:91.89(Materials Science, Multidisciplinary)

We have measured low frequency generation-recombination noise (g-r moise) spectra of a heavily boro-doped diamond crystal over the temperature range 20-300 K. The experimental results show that there are two peaks in the g-r noise spectrum at 120 K and 67 K, respectively. The 120 K peak corresponds to experimental evidence for the existence of hard gap having width of 10.4 meV. We interpret the 67 K peak as evidence for Wigner lattice formation whose gap width is 5.8 meV.

Journal Articles

In-out asymmetry of low-$$Z$$ impurity deposition on the JT-60 divertor tiles

Masaki, Kei; Yagyu, Junichi; Miyo, Yasuhiko; Goto, Yoshitaka*; Arai, Takashi; Hayashi, Takao; Kodama, Kozo; Sasajima, Tadayuki; Kaminaga, Atsushi; Tanabe, Tetsuo*; et al.

Journal of Nuclear Materials, 329-333(Part1), p.845 - 848, 2004/08

 Times Cited Count:0 Percentile:100(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Boronization effects using deuterated-decaborane (B$$_{10}$$D$$_{14}$$) in JT-60U

Nakano, Tomohide; Higashijima, Satoru; Kubo, Hirotaka; Yagyu, Junichi; Arai, Takashi; Asakura, Nobuyuki; Itami, Kiyoshi

Journal of Nuclear Materials, 313-316(1-3), p.149 - 152, 2003/03

 Times Cited Count:27 Percentile:13.14

In JT-60U, boronization using hydride-decaborane (B$$_{10}$$D$$_{14}$$) was performed to reduce oxygen impurity and particle recycling. A problem of the boronization was that hydrogen originating from hydride-decaborane diluted core deuterium plasmas. In order to minimize the number of conditioning tokamak discharges, boronization using deuterated-decaborane (B$$_{10}$$D$$_{14}$$) has been introduced recently. In order to investigate durability of the boronization effects, discharges with an identical condition were repeated. Boronization using 20 g of deuterated-decaborane could reduce a core oxygen content from $$sim$$ 1.9% to only $$sim$$ 1.3% in L-mode discharges with a neutral beam heating power of $$sim$$ 4 MW. Boronization using 70 g of deuterated-decaborane reduced the core oxygen content from $$sim$$ 2.2% to $$sim$$ 0.5%. After the boronization using 70 g of deuterated-decaborane ( thickness of the Boron layer $$sim$$ 135 nm ), the core oxygen content increased gradually from $$sim$$ 0.5% to $$sim$$ 1% in $$sim$$ 400 shots.

Journal Articles

Analysis technology of nuclear fusion materials by XPS

Yagyu, Junichi; Goto, Yoshitaka*; Arai, Takashi; Miya, Naoyuki; Morimoto, Yasutomi*; Okuno, Kenji*; Oya, Yasuhisa*; Hirohata, Yuko*; Tanabe, Tetsuo*

Heisei-15-Nendo Kiki, Bunseki Gijutsu Kenkyukai Hokoku, p.105 - 108, 2003/00

no abstracts in English

Journal Articles

Experiments and analyses on sodium void reactivity worth in uranium-free fast reactor at FCA

Oigawa, Hiroyuki; Iijima, Susumu; Ando, Masaki

Journal of Nuclear Science and Technology, 39(7), p.729 - 735, 2002/07

 Times Cited Count:0 Percentile:100(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Release of hydrogen isotopes from boron coated carbon tiles of JT-60U

Kizu, Kaname; Yagyu, Junichi; Goto, Yoshitaka*; Arai, Takashi; Miya, Naoyuki

Fusion Science and Technology, 41(3), p.907 - 911, 2002/05

no abstracts in English

Journal Articles

Testing for compatibility of reduced activation ferritic steel with plasma on JFT-2M; Partial coverage of the vacuum vessel with ferritic steel

Tsuzuki, Kazuhiro; Isei, Nobuaki; Kawashima, Hisato; Sato, Masayasu; Kimura, Haruyuki; Ogawa, Hiroaki; Miura, Yukitoshi; Ogawa, Toshihide; Shibata, Takatoshi; Akiyama, Takashi*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 78(5), p.455 - 461, 2002/05

no abstracts in English

Journal Articles

Progress of advanced material tokamak experiment (AMTEX) program on JFT-2M

Kimura, Haruyuki; Sato, Masayasu; Kawashima, Hisato; Isei, Nobuaki; Tsuzuki, Kazuhiro; Ogawa, Hiroaki; Ogawa, Toshihide; Miura, Yukitoshi; Yamamoto, Masahiro; Shibata, Takatoshi; et al.

Fusion Engineering and Design, 56-57, p.837 - 841, 2001/10

 Times Cited Count:13 Percentile:29.05

no abstracts in English

Journal Articles

The Boron concentration measurement by the prompt $$gamma$$-ray analysis device at JRR-4

Hori, Naohiko; Yamamoto, Tetsuya*; Matsumura, Akira*; Torii, Yoshiya; Yamamoto, Kazuyoshi; Kishi, Toshiaki; Takada, Juntaro*

Proceedings of 9th International Symposium on Neutron Capture Therapy for Cancer, p.263 - 264, 2000/10

no abstracts in English

JAEA Reports

Creep strength of Hastelloy XR welded joints

Tachibana, Katsumi; Nishi, Hiroshi; Eto, Motokuni;

JAERI-Tech 99-024, 65 Pages, 1999/03

JAERI-Tech-99-024.pdf:3.01MB

no abstracts in English

JAEA Reports

Analyses of temperature reactivity coefficient in plutonium nitrate solutions (Contract research)

Yamamoto, Toshihiro; Miyoshi, Yoshinori

JAERI-Research 99-026, 24 Pages, 1999/03

JAERI-Research-99-026.pdf:0.97MB

no abstracts in English

Journal Articles

Development of a synthetic diamond radiation detector with a boron doped CVD diamond contact

Kaneko, Junichi; Katagiri, Masaki; Ikeda, Yujiro; Nishitani, Takeo

Nuclear Instruments and Methods in Physics Research A, 422, p.211 - 215, 1999/00

 Times Cited Count:24 Percentile:14.06

no abstracts in English

Journal Articles

Development of radiation detectors using synthetic diamond crystals

Kaneko, Junichi; Katagiri, Masaki; Ikeda, Yujiro; Nishitani, Takeo

Advanced Materials'98;Advanced Materials Research Utilizing Extreme Conditions, p.257 - 260, 1998/00

no abstracts in English

Journal Articles

Analysis on signals from synthetic diamond radiation detectors and suppression of a polarization phenomenon

Kaneko, Junichi; Katagiri, Masaki; Ikeda, Yujiro; Nishitani, Takeo

Radiation Detectors and Their Uses, p.259 - 263, 1998/00

no abstracts in English

Journal Articles

Measurements of hydrogen contents in boron films produced during boronization in JT-60U

Saido, Masahiro; Yagyu, Junichi; Yamamoto, Shunya; Goppelt-Langer, P.*; Aoki, Yasushi; Takeshita, Hidefumi; Naramoto, Hiroshi

Dai-4-Kai TIARA Kenkyu Happyokai Yoshishu, 0, p.44 - 45, 1995/00

no abstracts in English

Journal Articles

Retention and thermal release of oxygen implanted in boron carbide

Ogiwara, Norio; *; Saido, Masahiro; *; Saito, Yoshio*; *; *; *; *

Journal of Nuclear Materials, 220-222, p.748 - 751, 1995/00

 Times Cited Count:3 Percentile:61.37

no abstracts in English

Journal Articles

Investigation of plasma facing components in JT-60U operation

*; Ando, Toshiro; ; Arai, Takashi; Neyatani, Yuzuru; Yoshino, Ryuji; Tsuji, Shunji; Yagyu, Junichi; Kaminaga, Atsushi; ; et al.

Journal of Nuclear Materials, 220-222, p.390 - 394, 1995/00

 Times Cited Count:16 Percentile:17.64

no abstracts in English

39 (Records 1-20 displayed on this page)