Nobuta Yuji(Faculty of Engineering　Applied Quantum Science and Engineering　Quantum Engineering for Materials)

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Nobuta Yuji

Faculty of Engineering　Applied Quantum Science and Engineering　Quantum Engineering for Materials Assistant Professor

Researcher basic information

■ Degree

博士（工学）, 北海道大学

■ URL
researchmap URL

https://researchmap.jp/plasma?lang=en

ホームページURL

https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201301040014353111

■ Various IDs
Researcher number

80446450

J-Global ID

201301040014353111

■ Research Keywords and Fields
Research Keyword

核融合炉工学

プラズマ材料相互作用

レーザー表面改質

Research Field

Nanotechnology/Materials, Composite materials and interfaces

Nanotechnology/Materials, Metallic material properties

Energy Engineering, Nuclear fusion

Energy Engineering, Fundamental plasma

■ Educational Organization

Bachelor's degree program, School of Engineering

Master's degree program, Graduate School of Engineering

Doctoral (PhD) degree program, Graduate School of Engineering

Career

■ Career
Career

Apr. 2006 - Sep. 2007
日本原子力研究開発機構, 那珂核融合研究所, 博士研究員

Educational Background

Mar. 2006, Hokkaido University, Graduate School of Engineering, Division of Quantum Energy Engineering

Committee Memberships

Jul. 2025 - Jul. 2027
プラズマ・核融合学会, 編集委員

Research activity information

■ Papers

Recent progress of JT-60SA project toward plasma operation
H. Shirai; K. Takahashi; E. Di Pietro; D. Abate; W. Abdel Maksoud; H. Abe; N. Aiba; T. Abe; M. Akimitsu; J. Ayllon-Guerola; T. Arai; J. -F. Artaud; N. Asakura; N. Ashikawa; L. Balbinot; P. Barabaschi; O. Baulaigue; E. Belonohy; A. Belpane; W. Bin; F. Bombarda; T. Bolzonella; F. Bonne; M. Bonotto; J. Botija; J. Buermans; S. Cabrera-Perez; A. Cardella; D. Carralero; L. Carraro; J. Cavalier; M. Cavinato; M. Chernyshova; S. Chiba; S. Clement-Lorenzo; V. Cocilovo; S. Coda; R. Coelho; I. Coffey; B. Collin; V. Corato; A. Cucchiaro; T. Czarski; M. Dairaku; S. Davis; C. Day; E. Dela Luna; G. De Tommasi; P. Decool; L. Di Pace; M. Dibon; G. Disset; F. D'Lsa; A. Ejiri; Y. Endo; N. Ezumi; G. Falchetto; A. Fassina; P. Fejoz; A. Ferro; W. Fietz; L. Figini; T. Fornal; G. Frello; T. Fujita; T. Fukuda; K. Fukui; M. Fukumoto; H. Funaba; M. Furukawa; S. Futatani; L. Gabellieri; E. Gaio; K. Galazka; J. Garcia; J. Garcia-Dominguez; J. Garcia-Lopez; M. Garcia-Munoz; L. Garzotti; F. Gasparini; S. Gharafi; L. Giacomelli; G. Ginoulhiac; G. Giruzzi; L. Giudicotti; J. Gonzalez-Martin; R. Guillen-Gonzalez; N. Hajnal; S. Hall; K. Hamada; K. Hanada; M. Hanada; K. Hasegawa; S. Hatakeyama; V. Hauer; N. Hayashi; T. Hayashi; R. Heller; J. Hidalgo-Salaverri; S. Higashijima; J. Hinata; S. Hiranai; J. Hiratsuka; R. Hiwatari; C. Hoa; H. Homma; A. Honda; M. Honda; K. Hoshino; H. Hurzlmeier; M. Iafrati; K. Ibano; H. Ichige; M. Ichikawa; M. Ichimura; K. Ida; S. Ide; H. Idei; M. Iguchi; T. Iijima; S. Iio; R. Ikeda; Y. Ikeda; T. Imai; R. Imazawa; S. Inagaki; M. Inomoto; S. Inoue; A. Isayama; S. Ishida; Y. Ishii; M. Isobe; F. Janky; E. Joffrin; A. Jokinen; S. Kado; S. Kajita; K. Kajiwara; Y. Kamada; I. Kamata; A. Kaminaga; K. Kamiya; D. Kanapienyte; Y. Kashiwa; M. Kashiwagi; K. Katayama; Y. Kawamata; G. Kawamura; K. Kawano; Y. Kazakov; K. Kimura; F. Kin; M. Kisaki; S. Kitajima; K. Kiyono; K. Kizu; Y. Ko; K. Kobayashi; M. Kobayashi; S. Kobayashi; Ta. Kobayashi; To. Kobayashi; G. Kocsis; A. Kojima; S. Kokusen; M. Komata; K. Komuro; S. Konishi; A. Kovacsik; I. Ksiazek; M. Kubkowska; G. Kuehner; M. Kuramochi; K. Kurihara; T. Kurki-Suonio; A. B. Kurniawan; T. Kuwata; B. Lacroix; V. Lamaison; A. Lampasi; P. Lang; P. Lauber; K. Lawson; Q. LeCoz; A. Louzguiti; R. Maekawa; T. Maekawa; S. Maeyama; G. Maffia; P. Maget; J. Mailloux; I. Maione; A. Maistrello; K. Malinowski; A. Mancini; G. Marchiori; J. -L. Marechal; V. Massaut; S. Masuzaki; R. Matoike; G. Matsunaga; S. Matsunaga; A. Matsuyama; Ch Mayri; M. Mattei; M. Medrano; A. Mele; I. Meyer; F. Michel; T. Minami; Y. Miyata; J. Miyazawa; Y. Miyo; T. Mizuuchi; K. Mogaki; J. Morales; P. Moreau; T. Morisaki; S. Morishima; S. Moriyama; A. Moro; H. Murakami; M. Murayama; S. Murakami; K. Nagasaki; O. Naito; N. Nakamura; S. Nakamura; T. Nakano; Y. Nakashima; V. Nardino; E. Narita; Y. Narushima; K. Natsume; S. Nemoto; R. Neu; S. Nicollet; M. Nishikawa; S. Nishimura; T. Nishitani; M. Nishiura; T. Nishiyama; M. Nocente; Y. Nobuta; L. Novello; F. Nunio; S. Ochoa; K. Ogawa; T. Ogawa; Y. Ogawa; S. Ohdachi; Y. Ohmori; N. Ohno; Y. Ohtani; K. Ohtsu; M. Ohzeki; T. Oishi; J. Okano; K. Okano; Y. Onishi; M. Osakabe; T. Oshima; V. Ostuni; A. Owada; M. Oya; Y. Oya; T. Ozeki; M. M. Parody Guzman; R. Pasqualotto; S. Pelli; E. Perelli; E. Peretti; G. Phillips; C. Piccinni; L. Pigatto; A. Pironti; A. Pizzuto; B. Ploeckl; G. Polli; J. -M. Poncet; P. Ponsot; G. Pucella; M. Puiatti; D. Radloff; V. Raimondi; F. Ramos; P. Rancsik; D. Ricci; S. Ricciarini; N. Richermoz; E. Rincon; A. Romano; P. Rossi; P. Roussel; G. Rubino; H. Saeki; A. Sagara; S. Sakakibara; H. Sakamoto; Miki Sakamoto; Mizu Sakamoto; Y. Sakamoto; A. Sakasai; S. Sakata; R. Sakurai; B. Salanon; A. Salmi; G. Sannazzaro; R. Sano; A. Sanpei; T. Sasajima; S. Sasaki; H. Sasao; F. Sato; M. Sato; T. Sato; M. Sawahata; A. Scherber; S. Scully; J. Segado-Fernandez; M. Seki; N. Seki; S. Seki; Y. Shibama; Y. Shibata; T. Shikama; K. Shimada; M. Shimono; J. Shinde; T. Shinya; K. Shinohara; J. Shiraishi; S. Soare; A. Soleto; Y. Someya; S. Sonoda; C. Sozzi; E. Streciwilk-Kowalska; H. Strobel; M. Sueoka; A. Sukegawa; S. Sumida; H. Suzuki; Ma Suzuki; Mi Suzuki; S. Suzuki; T. Suzuki; Y. Suzuki; J. Svoboda; T. Szabolics; T. Szepesi; Y. Takase; M. Takechi; K. Takeda; Y. Takeiri; H. Takenaga; C. Taliercio; N. Tamura; Hiro Tanaka; Hito Tanaka; K. Tanaka; Y. Tanaka; K. Tani; H. Tanigawa; M. Tardocchi; A. Terakado; M. Terakado; T. Terakado; B. Teuchner; B. Tilia; H. Tobari; H. Tobita; K. Tobita; K. Toi; N. Toida; H. Tojo; M. Tokitani; T. Tokuzawa; V. Tormarchio; M. Tomine; A. Torre; T. Totsuka; K. Tsuchiya; N. Tsujii; D. Tsuru; H. Tsutsui; M. Uchida; Y. Ueda; J. Uno; H. Urano; K. Usui; H. Utoh; M. Valisa; M. Vallar; R. Vallcorba-Carbonel; J. -C. Vallet; J. Varela; J. Vega; M. Verrecchia; L. Vieillard; F. Villone; P. Vincenzi; K. Wada; R. Wada; T. Wakatsuki; M. Wanner; F. Watanabe; K. Watanabe; S. Watanabe; T. Wauters; S. Wiesen; M. Wischmeier; M. Yagi; J. Yagyu; M. Yajima; S. Yamamoto; H. Yamanaka; K. Yamauchi; Y. Yamauchi; H. Yamazaki; K. Yamazaki; R. Yamazaki; S. Yamoto; S. Yanagi; K. Yanagihara; S. Yokooka; M. Yokoyama; T. Yokoyama; M. Yoshida; M. Yoshimura; N. Yoshizawa; K. Yuinawa; L. Zani; P. Zito
NUCLEAR FUSION, 64, 11, 01 Nov. 2024, [Peer-reviewed]
English, Scientific journal

Surface chemistry of neutron irradiated tungsten in a high-temperature multi-material environment☆
Chase N. Taylor; Masashi Shimada; Yuji Nobuta; Makoto I. Kobayashi; Yasuhisa Oya; Yuji Hatano; Takaaki Koyanagi
Nuclear Materials and Energy, 34, 101323, 101323, Elsevier {BV}, Mar. 2023, [Peer-reviewed]
English, Scientific journal

Effect of rhenium addition on deuterium retention in neutron-irradiated tungsten
Y. Nobuta; T. Toyama; A. Matsumoto; M. Shimada; Y. Oya; K. Inoue; Y. Nagai; Y. Hatano
Journal of Nuclear Materials, 566, 153774, Elsevier BV, 01 Aug. 2022, [Peer-reviewed]
Scientific journal

Numerical analysis of deuterium migration behaviors in tungsten damaged by fast neutron by means of gas absorption method
Makoto Kobayashi; Masashi Shimada; Chase N. Taylor; Yuji Nobuta; Yuji Hatano; Yasuhisa Oya
FUSION ENGINEERING AND DESIGN, 168, Jul. 2021, [Peer-reviewed]
English, Scientific journal

Deuterium retention in tungsten irradiated by high-dose neutrons at high temperature
M. Oya; M. Shimada; C. N. Taylor; M. Kobayashi; Y. Nobuta; Y. Yamauchi; Y. Oya; Y. Ueda; Y. Hatano
NUCLEAR MATERIALS AND ENERGY, 27, Jun. 2021, [Peer-reviewed]
English, Scientific journal

Effects of Helium Seeding on Deuterium Retention in Neutron-Irradiated Tungsten
Yuji Nobuta; Masashi Shimada; Chase N. Taylor; Yasuhisa Oya; Yuji Hatano; Yaqiao Wu; Megha Dubey
FUSION SCIENCE AND TECHNOLOGY, 77, 1, 76, 79, Jan. 2021, [Peer-reviewed]
English, Scientific journal

D retention and depth profile behavior for single crystal tungsten with high temperature neutron irradiation
Y. Oya; F. Sun; Y. Yamauchi; Y. Nobuta; M. Shimada; C. N. Taylor; W. R. Wampler; M. Nakata; L. M. Garrison; Y. Hatano
JOURNAL OF NUCLEAR MATERIALS, 539, Oct. 2020, [Peer-reviewed]
English, Scientific journal

Hydrogen isotope exchange in tungsten during heating in hydrogen isotope gas atmosphere
Yuji Nobuta; Yuji Hatano; Sun Eui Lee; Masato Nakayama
FUSION ENGINEERING AND DESIGN, 157, Aug. 2020, [Peer-reviewed], [Lead author]
English, Scientific journal

Investigation of remaining tritium in the LHD vacuum vessel after the first deuterium experimental campaign
S. Masuzaki; T. Otsuka; K. Ogawa; M. Yajima; M. Tokitani; Q. Zhou; M. Isobe; Y. Oya; N. Yoshida; Y. Nobuta
PHYSICA SCRIPTA, T171, 1, Jan. 2020, [Peer-reviewed]
English, Scientific journal

Influence of dynamic annealing of irradiation defects on the deuterium retention behaviors in tungsten irradiated with neutron
Makoto Kobayashi; Masashi Shimada; Chase N. Taylor; Dean Buchenauer; Robert Kolasinski; Takaaki Koyanagi; Yuji Nobuta; Yuji Hatano; Yasuhisa Oya
FUSION ENGINEERING AND DESIGN, 146, 1624, 1627, Sep. 2019, [Peer-reviewed]
English, Scientific journal

Effects of baking in deuterium atmosphere on tritium removal from tungsten
Yuji Nobuta; Yuji Hatano; Yuji Torikai; Masato Nakayama
FUSION ENGINEERING AND DESIGN, 136, 674, 677, Nov. 2018, [Peer-reviewed]
English, Scientific journal

Extension of the operational regime of the LHD towards a deuterium experiment
Y. Takeiri; T. Morisaki; M. Osakabe; M. Yokoyama; S. Sakakibara; H. Takahashi; Y. Nakamura; T. Oishi; G. Motojima; S. Murakami; K. Ito; A. Ejiri; S. Imagawa; S. Inagaki; M. Isobe; S. Kubo; S. Masamune; T. Mito; I. Murakami; K. Nagaoka; K. Nagasaki; K. Nishimura; M. Sakamoto; R. Sakamoto; T. Shimozuma; K. Shinohara; H. Sugama; K. Y. Watanabe; J. W. Ahn; N. Akata; T. Akiyama; N. Ashikawa; J. Baldzuhn; T. Bando; E. Bernard; F. Castejon; H. Chikaraishi; M. Emoto; T. Evans; N. Ezumi; K. Fujii; H. Funaba; M. Goto; T. Goto; D. Gradic; Y. Gunsu; S. Hamaguchi; H. Hasegawa; Y. Hayashi; C. Hidalgo; T. Higashiguchi; Y. Hirooka; Y. Hishinuma; R. Horiuchi; K. Ichiguchi; K. Ida; T. Ido; H. Igami; K. Ikeda; S. Ishiguro; R. Ishizaki; A. Ishizawa; A. Ito; Y. Ito; A. Iwamoto; S. Kamio; K. Kamiya; O. Kaneko; R. Kanno; H. Kasahara; D. Kato; T. Kato; K. Kawahata; G. Kawamura; M. Kisaki; S. Kitajima; W. H. Ko; M. Kobayashi; S. Kobayashi; T. Kobayashi; K. Koga; A. Kohyama; R. Kumazawa; J. H. Lee; D. Lopez-Bruna; R. Makino; S. Masuzaki; Y. Matsumoto; H. Matsuura; O. Mitarai; H. Miura; J. Miyazawa; N. Mizuguchi; C. Moon; S. Morita; T. Moritaka; K. Mukai; T. Muroga; S. Muto; T. Mutoh; T. Nagasaka; Y. Nagayama; N. Nakajima; Y. Nakamura; H. Nakanishi; H. Nakano; M. Nakata; Y. Narushima; D. Nishijima; A. Nishimura; S. Nishimura; T. Nishitani; M. Nishiura; Y. Nobuta; H. Noto; M. Nunami; T. Obana; K. Ogawa; S. Ohdachi; M. Ohno; N. Ohno; H. Ohtani; M. Okamoto; Y. Oya; T. Ozaki; B. J. Peterson; M. Preynas; S. Sagara; K. Saito; H. Sakaue; A. Sanpei; S. Satake; M. Sato; T. Saze; O. Schmitz; R. Seki; T. Seki; I. Sharov; A. Shimizu; M. Shiratani; M. Shoji; C. Skinner; R. Soga; T. Stange; C. Suzuki; Y. Suzuki; S. Takada; K. Takahata; A. Takayama; S. Takayama; Y. Takemura; Y. Takeuchi; H. Tamura; N. Tamura; H. Tanaka; K. Tanaka; M. Tanaka; T. Tanaka; Y. Tanaka; S. Toda; Y. Todo; K. Toi; M. Toida; M. Tokitani; T. Tokuzawa; H. Tsuchiya; T. Tsujimura; K. Tsumori; S. Usami; J. L. Velasco; H. Wang; T. -H. Watanabe; T. Watanabe; J. Yagi; M. Yajima; H. Yamada; I. Yamada; O. Yamagishi; N. Yamaguchi; Y. Yamamoto; N. Yanagi; R. Yasuhara; E. Yatsuka; N. Yoshida; M. Yoshinuma; S. Yoshimura; Y. Yoshimura
NUCLEAR FUSION, 57, 10, Oct. 2017, [Peer-reviewed]
English, Scientific journal

Effects of modified surfaces produced at plasma-facing surface on hydrogen release behavior in the LHD
Y. Nobuta; S. Masuzaki; M. Tokitani; N. Ashikawa; D. Nagata; N. Yoshida; Y. Oya; M. Yajima; G. Motojima; H. Kasahara; M. Miyamoto; N. Ohno; Y. Yamauchi
NUCLEAR MATERIALS AND ENERGY, 12, 483, 487, Aug. 2017, [Peer-reviewed]
English, Scientific journal

Tritium Behavior and Neutron Irradiation Effect
OYA Yasuhisa; HATANO Yuji; KATAYAMA Kazunari; YAMAUCHI Yuji; NOBUTA Yuji; OTSUKA Teppei; CHIKADA Takumi; HARA Masanori; OYA Makoto; UEDA Yoshio; TOYAMA Takeshi
J. Plasma Fusion Res., Mar. 2017
Japanese

Effects of Mild Baking on Hydrogen Removal from the Modified Surface of the First Wall in the LHD
Yuji Nobuta; Suguru Masuzaki; Masayuki Tokitani; Naoko Ashikawa
Plasma and Fusion Research, 12, 1, 4, 2017
Scientific journal

Effect of impurity deposition layer formation on D retention in LHD plasma exposed W
Y. Oya; H. Fujita; C. Hu; Y. Uemura; S. Sakurada; K. Yuyama; X. Li; Y. Hatano; N. Yoshida; H. Watanabe; Y. Nobuta; Y. Yamauchi; M. Tokitani; S. Masuzaki; T. Chikada
NUCLEAR MATERIALS AND ENERGY, 9, 84, 88, Dec. 2016, [Peer-reviewed]
English, Scientific journal

Tritium desorption and tritium removal from tungsten pre-irradiated with helium
Yuji Nobuta; Yuji Hatano; Yuji Torikai; Masao Matsuyama; Shinsuke Abe; Yuji Yamauchi
FUSION ENGINEERING AND DESIGN, 109, 1179, 1182, Nov. 2016, [Peer-reviewed], [Lead author]
English, Scientific journal

Helium irradiation effects on tritium retention and long-term tritium release properties in polycrystalline tungsten
Y. Nobuta; Y. Hatano; M. Matsuyama; S. Abe; Y. Yamauchi; T. Hino
JOURNAL OF NUCLEAR MATERIALS, 463, 993, 996, Aug. 2015, [Peer-reviewed], [Lead author]
English, Scientific journal

Deuterium retention on He-irradiated F82H with surface impurity layer
N. Shinoda; Y. Yamauchi; Y. Nobuta
JOURNAL OF NUCLEAR MATERIALS, 463, 1001, 1004, Aug. 2015, [Peer-reviewed]
English, Scientific journal

Deuterium retention properties of SiC/SiC composites as plasma facing materials for fusion reactors after deuterium irradiation at elevated temperatures
Yuji Nobuta; Tomoaki Hino; Yuji Yamauchi; Takashi Nozawa
Journal of the Vacuum Society of Japan, 58, 5, 173, 176, Vacuum Society of Japan, 2015, [Peer-reviewed]
English, Scientific journal

Tritium retention properties of tungsten, graphite and co-deposited carbon film
Y. Nobuta; Y. Hatano; M. Matsuyama; S. Abe; S. Akamaru; Y. Yamauchi; T. Hino; S. Suzuki; M. Akiba
FUSION ENGINEERING AND DESIGN, 89, 7-8, 1516, 1519, Oct. 2014, [Peer-reviewed], [Lead author]
English, Scientific journal

Effect of induced damage on hydrogen isotope retention of F82H with impurity layer
N. Shinoda; Y. Yamauchi; Y. Nobuta; T. Hino
FUSION ENGINEERING AND DESIGN, 89, 7-8, 921, 924, Oct. 2014, [Peer-reviewed]
English, Scientific journal

Influence of surface condition on deuterium release from Li2TiO3 pebble
Akihito Tsuchiya; Yuji Yamauchi; Yuji Nobuta; Tomoaki Hino; Masato Akiba; Mikio Enoeda
FUSION ENGINEERING AND DESIGN, 89, 7-8, 1280, 1283, Oct. 2014, [Peer-reviewed]
English, Scientific journal

Tritium retention on the surface of stainless steel samples fixed on the plasma-facingwall in LHD
Masao Matsuyama; Shinsuke Abe; Kiyohiko Nishimura; Naoko Ashikawa; Yasuhisa Oya; Kenji Okuno; Yuji Yamauchi; Yuji Nobuta; Akio Sagara
Plasma and Fusion Research, 9, 2, Japan Society of Plasma Science and Nuclear Fusion Research, 2014, [Peer-reviewed]
English, Scientific journal

Effects of hydrogen mixture into helium gas on deuterium removal from lithium titanate
Akihito Tsuchiya; Tomoaki Hino; Yuji Yamauchi; Yuji Nobuta; Masato Akiba; Mikio Enoeda
FUSION ENGINEERING AND DESIGN, 88, 9-10, 2298, 2301, Oct. 2013, [Peer-reviewed]
English, Scientific journal

Deterioration of lithium ion battery performance due to film formation on graphite surfaces
Shota Takamaru; Tomoaki Hino; Yuji Yamauchi; Yuji Nobuta
Journal of the Vacuum Society of Japan, 56, 7, 277, 279, 03 Sep. 2013, [Peer-reviewed]
Scientific journal

Hydrogen concentration of co-deposited carbon film produced in the vicinity of LHD divertor tiles
Y. Nobuta; K. Fukayama; N. Ashikawa; Y. Yamauchi; T. Hino; A. Sagara
JOURNAL OF NUCLEAR MATERIALS, 438, S1040, S1043, Jul. 2013, [Peer-reviewed]
English, Scientific journal

Effects of glow discharge cleanings on hydrogen isotope removal for plasma facing materials
Y. Yamauchi; A. Matsumoto; Y. Kosaka; Y. Kimura; K. Takeda; T. Hino; Y. Nobuta; K. Nishimura; Y. Ueda
JOURNAL OF NUCLEAR MATERIALS, 438, S1146, S1149, Jul. 2013, [Peer-reviewed]
English, Scientific journal

Deuterium Retention Properties of Co-Deposited Carbon Films Produced at Wall Gaps
NOBUTA Yuji; KANAZAWA Jun; YAMAUCHI Yuji; HINO Tomoaki; YOKOYAMA Kenji; SUZUKI Satoshi; EZATO Koichiro; ENOEDA Mikio; AKIBA Masato; AKAMARU Satoshi; HATANO Yuji
Plasma and Fusion Research, 8, 2405174, 2405174, The Japan Society of Plasma Science and Nuclear Fusion Research, 2013
English, Deuterium retention properties in co-deposited carbon film produced in gap and the relationship between this retention behavior and the crystal structure of carbon film were investigated. In the case of a wide gap, the atomic ratio of deuterium to carbon (D/C) in the film was almost constant at any depth in the gap, while in the case of a narrow gap the D/C ratio decreased with increasing distance from the gap entrance. The micro structure of carbon film tended to be more amorphous for the film produced at locations deeper in the gap. Thermal desorption spectra of D₂in the film produced near the gap entrance showed one broad main peak at around 1100 K, while that in the film produced near the bottom showed very sharp peaks at around 950 K. This difference in desorption behavior was related with the differences of micro structure.

Evaluation of Plasma-Wall Interactions Using Material Probes in the Large Helical Device
SHIGEMURA Takuya; SHINODA Naoyuki; YAMAUCHI Yuji; NOBUTA Yuji; HINO Tomoaki; ASHIKAWA Naoko; SAGARA Akio; NISHIMURA Kiyohiko; LHD Experimental Group
Plasma and Fusion Research, 8, 2405162, 2405162, The Japan Society of Plasma Science and Nuclear Fusion Research, 2013
English, Control of plasma-wall interactions (PWIs) and understanding their mechanism are essential issues for realization of fusion reactor. In this study, plasma-wall interactions during FY2010 and FY2011 experiments in the Large Helical Device (LHD) were analyzed by using material probes. We installed material probes at the positions expected to have different deposits of materials such as boron and titanium and investigated the correlation between this impurity deposition and gas retention. The desorption behavior of hydrogen and helium depended on the level of impurity deposition. We observed a new peak for hydrogen desorption at the probe with large boron deposits. The amount of retained hydrogen was large in that probe; however the amount of retained helium was small in the same probe, which is opposite what we observe in the probe with titanium deposits and the probe with a thin deposition layer.

Deuterium Retention in Tungsten-Coated Reduced Activation Ferritic/Martensitic Steel
ARMANDO Marco; YAMAUCHI Yuji; TSUCHIYA Akihito; NOBUTA Yuji; HINO Tomoaki
Plasma and Fusion Research, 8, 2405103, 2405103, The Japan Society of Plasma Science and Nuclear Fusion Research, 2013
English, In order to evaluate tungsten (W) coating performance, thin W film was deposited onto reduced activation ferritic/martensitic steel (F82H) by using rf magnetron sputtering device, then was irradiated at room temperature by 1.7keV D⁺ions. After the irradiation, the deuterium retention of the coated sample (W/F82H) was evaluated by thermal desorption spectroscopy (TDS) and compared with those of the F82H and pure W. During TDS measurements, D₂was desorbed in all materials but HD was only found in significant amount in W/F82H and related to the increase of effective surface area due to the porous film structure. D retention increased with increasing fluence and was accompanied by growth of circular blisters. The size of blisters was limited by the F82H substrate structure.

Toroidal distributions of amounts of retained gases and deposited impurities during 13th experimental campaign in the LHD
Naoyuki Shinoda; Naoko Ashikawa; Yuji Nobuta; Yuji Yamauchi; Tomoaki Hino; S. Suguru Masuzaki; Akio Sagara
Plasma and Fusion Research, 7, SPL.ISS.1, 01 Dec. 2012, [Peer-reviewed]
Scientific journal

Tritium absorption of co-deposited carbon films
Yuji Nobuta; Yuji Yamauchi; Tomoaki Hino; Satoshi Akamaru; Yuji Hatano; Masao Matsuyama; Satoshi Suzuki; Masato Akiba
FUSION ENGINEERING AND DESIGN, 87, 7-8, 1070, 1073, Aug. 2012, [Peer-reviewed], [Lead author]
English, Scientific journal

REMOVAL OF DEUTERIUM RETAINED IN B, Ti, AND TiO2 BY NEON GLOW DISCHARGE
Y. Yamauchi; Y. Kosaka; Y. Nobuta; T. Hino; K. Nishimura
FUSION SCIENCE AND TECHNOLOGY, 62, 1, 66, 70, Jul. 2012, [Peer-reviewed]
English, Scientific journal

Removal of deuterium in lithium titanate by sweep gas exposure
Akihito Tsuchiya; Tomoaki Hino; Yuji Yamauchi; Yuji Nobuta; Masato Akiba; Mikio Enoeda
Plasma and Fusion Research, 7, SPL.ISS.1, 2405097, 2012, [Peer-reviewed]
English, Scientific journal

Effects of helium ion irradiation on deuterium retention behavior of SiC/SiC composites as plasma facing materials for fusion reactors
Yuji Nobuta; Yuji Yamauchi; Tomoaki Hino; Han-Ki Yoon
Journal of the Vacuum Society of Japan, 55, 4, 164, 166, 2012, [Peer-reviewed]
English, International conference proceedings

Deuterium retention and desorption behavior of co-deposited carbon film produced in gap
Yuji Nobuta; Kenji Yokoyama; Jun Kanazawa; Yuji Yamauchi; Tomoaki Hino; Satoshi Suzuki; Koichiro Ezato; Mikio Enoeda; Masato Akiba
Plasma and Fusion Research, 7, 1, 2012, [Peer-reviewed]
English, Scientific journal

TRITIUM ABSORPTION OF CO-DEPOSITED CARBON FILMS, GRAPHITE AND POLYCRYSTALLINE TUNGSTEN
Y. Nobuta; Y. Yamauchi; T. Hino; S. Akamaru; Y. Hatano; M. Matsuyama; S. Suzuki; M. Akiba
FUSION SCIENCE AND TECHNOLOGY, 60, 4, 1535, 1538, Nov. 2011, [Peer-reviewed]
English, Scientific journal

HYDROGEN ISOTOPE RETENTION AND DESORPTION IN TUNGSTEN DURING GLOW DISCHARGES
Y. Yamauchi; Y. Kimura; Y. Kosaka; Y. Nobuta; T. Hino; K. Nishimura; Y. Ueda
FUSION SCIENCE AND TECHNOLOGY, 60, 4, 1475, 1478, Nov. 2011, [Peer-reviewed]
English, Scientific journal

Exchange and reduction of retained hydrogen isotope by glow discharges
Yukihiko Kimura; Tomoaki Hino; Kiyohiko Nishimura; Yuji Yamauchi; Yuji Nobuta
JOURNAL OF NUCLEAR MATERIALS, 417, 1-3, 896, 899, Oct. 2011, [Peer-reviewed]
English, Scientific journal

Deuterium concentration of co-deposited carbon layer produced at gap of wall tiles
Y. Nobuta; K. Yokoyama; J. Kanazawa; Y. Yamauchi; T. Hino; S. Suzuki; K. Ezato; M. Enoeda; M. Akiba
JOURNAL OF NUCLEAR MATERIALS, 417, 1-3, 607, 611, Oct. 2011, [Peer-reviewed], [Lead author]
English, Scientific journal

Helium retention and surface morphology of oxidized vanadium alloy
Y. Yamauchi; D. Oku; T. Hino; T. Shibayama; Y. Nobuta; T. Nagasaka; T. Muroga
JOURNAL OF NUCLEAR MATERIALS, 417, 1-3, 327, 329, Oct. 2011, [Peer-reviewed]
English, Scientific journal

Deuterium ion irradiation for tritium breeding material and evaluation for tritium inventories in test blanket module and blanket of a demonstration reactor
T. Hino; H. Shibata; Y. Yamauchi; Y. Nobuta; S. Suzuki; M. Akiba
JOURNAL OF NUCLEAR MATERIALS, 417, 1-3, 713, 717, Oct. 2011, [Peer-reviewed]
English, Scientific journal

Deuterium retention in F82H after low energy hydrogen ion irradiation
T. Ito; Y. Yamauchi; T. Hino; T. Shibayama; Y. Nobuta; K. Ezato; S. Suzuki; M. Akiba
JOURNAL OF NUCLEAR MATERIALS, 417, 1-3, 1147, 1149, Oct. 2011, [Peer-reviewed]
English, Scientific journal

Reduction of Gas Desorption in Graphite Anode Used in Lithium Ion Battery by Hydrogen Plasma Irradiation
MINAMI Tatsuya; NOBUTA Yuji; YAMAUCHI Yuji; HINO Tomoaki
Journal of the Vacuum Society of Japan, 54, 3, 231, 234, 日本真空協会, Mar. 2011, [Peer-reviewed]
English, Scientific journal

Reduction of Deuterium Retention by Inert Gas Glow Discharges
Y. Kimura; T. Hino; K. Nishimura; Y. Yamauchi; Y. Nobuta
Journal of Nuclear Materials, 417, 896, 899, 2011, [Peer-reviewed]
English, Scientific journal

Hydrogen concentration of co-deposited carbon films produced in the vicinity of local island divertor
T. Hino; T. Hirata; N. Ashikawa; S. Masuzaki; Y. Yamauchi; Y. Nobuta
Journal of Energy and Power Engineering, 5, 428, 433, 2011, [Peer-reviewed]
English, Scientific journal

Hydrogen retention properties of SiC/SiC composites as plasma facing material of fusion reactor
Yuji Nobuta; Yuji Yamauchi; Tomoaki Hino; Ho-Jun Cho; Han-Ki Yoon
Journal of the Vacuum Society of Japan, 54, 3, 149, 151, 2011, [Peer-reviewed]
English, International conference proceedings

Oblique Ion Etching for Copper at Elevated Temperature
T. Hino; T. Kobayashi; Y. Yamauchi; Y. Nobuta; M. Nishikawa
APPLIED ELECTROMAGNETIC ENGINEERING FOR MAGNETIC, SUPERCONDUCTING AND NANOMATERIALS, 670, 131, +, 2011, [Peer-reviewed]
English, International conference proceedings

Performances of inert gas glow discharges for reductions of fuel hydrogen retention and helium retention
T. Hino; M. Kimura; Y. Yamauchi; K. Nishimura; N. Ashikawa; Y. Nobuta
FUSION ENGINEERING AND DESIGN, 85, 7-9, 974, 978, Dec. 2010, [Peer-reviewed]
English, Scientific journal

Deuterium retention and desorption behavior of reduced activated ferritic steel with surface damage due to high energy helium ion irradiation
Y. Yamauchi; K. Gotoh; Y. Nobuta; T. Hino; S. Suzuki; M. Akiba
FUSION ENGINEERING AND DESIGN, 85, 10-12, 1838, 1840, Dec. 2010, [Peer-reviewed]
English, Scientific journal

Gas Desorption Behavior of Graphite Anodes in Lithium Ion Secondary Batteries After Adsorption of Electrolytes
WATANABE Toshinori; NOBUTA Yuji; YAMAUCHI Yuji; HINO Tomoaki; KUBOTA Yoshihiro; OHZEKI Katsutomo
Journal of the Vacuum Society of Japan, 53, 8, 497, 500, 日本真空協会, Aug. 2010, [Peer-reviewed]
English, Scientific journal

WALL CONDITIONING IN LHD
S. Masuzaki; N. Ashikawa; K. Nishimura; M. Tokitani; T. Hino; Y. Yamauchi; Y. Nobuta; N. Yoshida; M. Miyamoto; A. Sagara; N. Noda; H. Yamada; A. Komori
FUSION SCIENCE AND TECHNOLOGY, 58, 1, 297, 304, Jul. 2010, [Peer-reviewed]
English, Scientific journal

CHARACTERIZATION OF SURFACE MODIFICATIONS OF PLASMA-FACING COMPONENTS IN LHD
M. Tokitani; N. Yoshida; M. Miyamoto; T. Hino; Y. Nobuta; S. Masuzaki; N. Ashikawa; A. Sagara; N. Noda; H. Yamada; A. Komori
FUSION SCIENCE AND TECHNOLOGY, 58, 1, 305, 320, Jul. 2010, [Peer-reviewed]
English, Scientific journal

FUEL RETENTION IN LHD
S. Masuzaki; M. Kobayashi; M. Tokitani; N. Ashikawa; T. Hino; Y. Yamauchi; Y. Nobuta; N. Yoshida; M. Miyamoto; R. Sakamoto; J. Miyazawa; T. Morisaki; N. Ohyabu; H. Yamada; A. Komori
FUSION SCIENCE AND TECHNOLOGY, 58, 1, 321, 330, Jul. 2010, [Peer-reviewed]
English, Scientific journal

4.核融合炉用プラズマ対向機器構造材料の燃料水素の吸蔵に関する研究
日野友明; 鈴木哲; 信太祐二; 山内有二; 金澤潤
日本原子力研究開発機構JAEA-Review, 12-14,63-66, Nov. 2009
Japanese

Retention and depth profile of hydrogen isotopes in gaps of the first wall in JT-60U
Y. Nobuta; T. Arai; J. Yagyu; K. Masaki; M. Satoh; T. Tanabe; Y. Yamauchi; T. Hino
JOURNAL OF NUCLEAR MATERIALS, 390-91, 643, 646, Jun. 2009, [Peer-reviewed], [Lead author]
English, Scientific journal

Localized tungsten deposition in divertor region in JT-60U
Y. Ueda; M. Fukumoto; J. Watanabe; Y. Ohtsuka; T. Arai; N. Asakura; Y. Nobuta; M. Sato; T. Nakano; J. Yagyu; K. Ochiai; K. Takakura; T. Tanabe
NUCLEAR FUSION, 49, 6, Jun. 2009, [Peer-reviewed]
English, Scientific journal

Hydrogen isotopes retention in the outboard first wall tiles of JT-60U
M. Yoshida; T. Tanabe; Y. Nobuta; T. Hayashi; K. Masaki; M. Sato
JOURNAL OF NUCLEAR MATERIALS, 390-91, 635, 638, Jun. 2009, [Peer-reviewed]
English, Scientific journal

Hydrogen and helium removal retained in stainless steel by neon glow discharge
Y. Yamauchi; K. Takeda; Y. Nobuta; T. Hino
JOURNAL OF NUCLEAR MATERIALS, 390-91, 1048, 1050, Jun. 2009, [Peer-reviewed]
English, Scientific journal

Helium Retention and Desorption Behaviour of Reduced Activation Ferritic/Martenstic Steel
Wang Pinghuai; Nobuta Yuji; Hino Tomoaki; Yamauchi Yuji; Chen Jiming; Xu Zengyu; Li Xiongwei; Liu Shi
PLASMA SCIENCE & TECHNOLOGY, 11, 2, 225, 230, Apr. 2009, [Peer-reviewed]
English, Scientific journal

Hydrogen behavior in damaged tungsten by high-energy ion irradiation
M. Fukumoto; H. Kashiwagi; Y. Ohtsuka; Y. Ueda; Y. Nobuta; J. Yagyu; T. Arai; M. Taniguchi; T. Inoue; K. Sakamoto
JOURNAL OF NUCLEAR MATERIALS, 386-88, 768, 771, Apr. 2009, [Peer-reviewed]
English, Scientific journal

Oblique Argon Ion Etching for Copper at Elevated Temperature
T. Kobayashi; Y. Nobuta; Y. Yamauchi; T. Hino
Journal of Plasma and Fusion Research SERIES, 8, 1358, 1360, 2009, [Peer-reviewed]
English, Scientific journal

Hydrophilization of Polycarbonate by Ar Glow Discharge
K. Nagai; Y. Nobuta; Y. Yamauchi; T. Hino
Journal of Plasma and Fusion Research SERIES, 8, 1392, 1394, 2009, [Peer-reviewed]
English, Scientific journal

Deuterium Retention and Desorption Behavior of Li2TiO3 after Deuterium Ion Irradiations with Different Temperatures
H. Shibata; Y. Nobuta; Y. Yamauchi; T. Hino; M. Akiba; S. Suzuki
Journal of Plasma and Fusion Research SERIES, 8, 1191, 1194, 2009, [Peer-reviewed]
English, Scientific journal

Analysis for Surface Probes Prepared 10th Experimental Campaign of LHD
H. Yagihashi; T. Hirata; N. Ashikawa; T. Hino; Y. Yamauchi; Y. Nobuta; S. Masuzaki; K. Nishimura; A. Sagara; N. Oyabu; A. Komori; O. Motojima
Journal of Plasma and Fusion Research SERIES, 8, 425, 428, 2009, [Peer-reviewed]
English, Scientific journal

Deposition and transport of ¹³C from methane injection into outer divertor plasma in JT-60U
Yuji Nobuta; Kei Masaki; Takashi Arai; Akira Sakasai; Naoyuki Miya; Tetsuo Tanabe
34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts, 31, 271, 274, 01 Dec. 2007

Plasma wall interaction study in the large helical device
I. Hino; Y. Nobuta; N. Ashikawa; K. Nishimura; S. Masuzaki; A. Sagara; Y. Hirohata; Y. Yamauchi; N. Noda; N. Ohyabu; A. Komori; O. Motojima
FUSION ENGINEERING AND DESIGN, 82, 15-24, 1621, 1626, Oct. 2007, [Peer-reviewed]
English, Scientific journal

Comparison of boronized wall in LHD and JT-60U
N. Ashikawa; K. Kizu; J. Yagyu; T. Nakahata; Y. Nobuta; K. Nishimura; A. Yoshikawa; Y. Ishimoto; Y. Oya; K. Okuno; N. Miya; T. Hino; S. Masuzaki; A. Sagara; N. Ohyabu
JOURNAL OF NUCLEAR MATERIALS, 363, 1352, 1357, Jun. 2007, [Peer-reviewed]
English, Scientific journal

Investigation of Carbon Films on Material Probes in the Vicinity of Local Island Divertor in the Large Helical Device
HINO Tomoaki; HIRATA Tomoya; NOBUTA Yuji; MASUZAKI Suguru; ASHIKAWA Naoko; SAGARA Akio; NODA Nobuaki; OHYABU Nobuyoshi; KOMORI Akio; MOTOJIMA Osamu; LHD Experimental Group
Plasma and Fusion Research, 2, 11, 11, The Japan Society of Plasma Science and Nuclear Fusion Research, 2007
English, Two sets of material probes were installed in LHD in the vicinity of the Local Island Divertor (LID) head made of carbon fiber composite. One set of the material probes faced the LID head, while the other set was placed in a shallow line of sight to the head. Carbon films on the former and the later sets of probes are expected to be formed by the deposition of physically sputtered carbon atoms and chemically sputtered hydrocarbon, respectively, during the LID discharges. Surface morphology and thickness of the films, and the amount of retained hydrogen in the films were investigated, and hydrogen concentration in the probes was estimated. The hydrogen concentration in the carbon films on the probes placed in a shallow line of sight of the head was significantly large with the atomic ratio of H/C = 0.6-1.1.

Material probe analysis of boronized wall in LHD
Y Nobuta; N Ashikawa; T Hino; Y Yamauchi; Y Hirohata; K Nishimura; A Sagara; S Masuzaki; N Noda; N Ohyabu; A Komori; O Motojima
FUSION ENGINEERING AND DESIGN, 81, 1-7, 187, 192, Feb. 2006, [Peer-reviewed], [Lead author]
English, Scientific journal

Progress of plasma surface interaction study on low activation materials
T Hino; E Hayashishita; T Yamada; Liu, X; A Kohyama; Y Yamauchi; Y Hirohata; Y Nobuta
FUSION ENGINEERING AND DESIGN, 81, 1-7, 181, 186, Feb. 2006, [Peer-reviewed]
English, Scientific journal

Energy and fluence dependences of helium retention in stainless steel
Y Nobuta; Y Yamauchi; Y Hirohata; T Hino; N Ashikawa; K Nishimura; A Sagara; S Masuzaki; T Ozaki; N Noda; A Komori; O Motojima
JOURNAL OF NUCLEAR MATERIALS, 337, 1-3, 932, 936, Mar. 2005, [Peer-reviewed], [Lead author]
English, Scientific journal

Material probe study for plasma facing wall of LHD
Y Nobuta; Y Yamauchi; Y Hirohata; T Hino; A Sagara; S Masuzaki; N Ashikawa; N Noda; O Motojima
JOURNAL OF NUCLEAR MATERIALS, 329, 21, 800, 803, Aug. 2004, [Peer-reviewed], [Lead author]
English, Scientific journal

Material probe analysis for plasma facing surface in the large helical device
T Hino; A Sagara; Y Nobuta; N Inoue; Y Hirohata; Y Yamauchi; S Masuzaki; N Noda; H Suzuki; A Komori; N Ohyabu; O Motojima
NUCLEAR FUSION, 44, 4, 496, 502, Apr. 2004, [Peer-reviewed]
English, Scientific journal

Helium retention of 316L stainless steel used for the first wall of the Large Helical Device (LHD)
Yuji Nobuta; Yuji Yamauchi; Yuko Hirohata; Tomoaki Hino; Akio Sagara; Suguru Masuzaki; Naoko Ashikawa; Tetsu Ozaki; Nobuaki Noda
Shinku/Journal of the Vacuum Society of Japan, 47, 6, 484, 487, Vacuum Society of Japan, 2004, [Peer-reviewed]
English

Analysis for surface probes of third experimental campaign in the large helical device
T Hino; Y Nobuta; Y Yamauchi; Y Hirohata; A Sagara; S Masuzaki; N Inoue; N Noda; O Motojima
JOURNAL OF NUCLEAR MATERIALS, 313, 167, 171, Mar. 2003, [Peer-reviewed]
English, Scientific journal

Impurity deposition and retention of discharge gas on plasma facing wall in LHD
Yuji Nobuta; Yuji Yamauchi; Yuko Hirohata; Tomoaki Hino; Akio Sagara; Suguru Masuzaki; Naoko Asikawa; Nobuaki Noda; Osamu Motojima
Shinku/Journal of the Vacuum Society of Japan, 46, 8, 628, 631, Vacuum Society of Japan, 2003, [Peer-reviewed]
Japanese, Scientific journal

Analysis of Impurities Deposited on a Material Probe Placed in Large Helical Device (LHD)-Effect of a Carbon Divertor on Impurity Deposition
HIROHATA Yuko; NOBUTA Yuji; YAMAUCHI Yuji; HASHIBA Masao; HINO Tomoaki; INOUE Noriyuki; MASUZAKI Suguru; SAGARA Akio; NODA Nobuaki; MOTOJIMA Osamu
SHINKU, 45, 3, 161, 164, 日本真空協会, Mar. 2002, [Peer-reviewed]
Japanese, Scientific journal

■ Other Activities and Achievements

中性子照射によるタングステンの材料特性と水素同位体挙動の変化(3)中性子照射タングステンやタングステン合金における水素蓄積・透過挙動—Hydrogen Isotope Retention and Permeation Behavior in Neutron-Irradiated Tungsten and Tungsten Alloys
信太祐二; 大矢恭久, プラズマ・核融合学会誌 = Journal of plasma and fusion research / プラズマ・核融合学会編集委員会編, 101, 3, 83, 90, Mar. 2025
名古屋 : プラズマ・核融合学会編集委員会, Japanese

高温中性子照射したタングステン中における水素同位体挙動
大矢恭久; 小林真; 大塚哲平; 片山一成; 信太祐二; 山内有二; 原正憲; 波多野雄治; 島田雅; BUCHENAUER Dean; 加藤雄大, 核融合エネルギー連合講演会(CD-ROM), 12th, ROMBUNNO.28P‐52, 2018
Japanese

日米科学技術協力事業PHENIX計画―前半の成果と後半の研究計画―5.タスク3 トリチウム挙動および中性子照射効果
大矢恭久; 波多野雄治; 片山一成; 山内有二; 信太祐二; 大塚哲平; 近田拓未; 原正憲; 大宅諒; 上田良夫; 外山健, プラズマ・核融合学会誌, 93, 3, 139‐143, 25 Mar. 2017
Japanese

Li₂TiO₃の組成変化及び欠陥生成が重水素脱離挙動に与える影響
鈴木祐太; 信太祐二; 山内有二; 星野毅, 日本原子力学会北海道支部研究発表会講演要旨集, 34th, 12‐13, 2017
Japanese

高温で水素に曝されたリチウムタイタネート(Li₂TiO₃)の原子組成及び重水素脱離挙動の評価
鈴木祐太; 信太祐二; 山内有二; 星野毅, 日本原子力学会春の年会予稿集(CD-ROM), 2016, ROMBUNNO.3L05, 16 Mar. 2016
Japanese

アルゴンガスパフ下におけるタングステンの重水素保持挙動
笠間俊行; 山内有二; 信太祐二; 西村清彦, 日本原子力学会春の年会予稿集(CD-ROM), 2016, ROMBUNNO.1J04, 16 Mar. 2016
Japanese

プラズマ装置からの排ガスにおける水素同位体化学種の定量的評価とその精製挙動
湯山健太; 植村有希; 桜田翔大; 藤田啓恵; HU Cui; 近田拓未; 大矢恭久; 松山政夫; 原正憲; 日野友明; 山内有二; 信太祐二; 田中将裕; 相良明男, 日本原子力学会秋の大会予稿集(CD-ROM), 2015, ROMBUNNO.N40, 21 Aug. 2015
Japanese

高温下で重水素イオン照射した核融合炉用SiC繊維強化SiC複合材料の重水素保持挙動と損耗評価
信太祐二; 日野友明; 山内有二; 野澤貴史, 真空に関する連合講演会講演予稿集, 55th, 104, 18 Nov. 2014
Japanese

Investigation of Tritium Inventory and Removal on Deposition Layer in LHD
Ashikawa N.; Nishimura K.; Torikai Y.; Matsuyama M.; Hong S-H.; Hamaji Y.; Ueda Y.; Yamauchi Y.; Nobuta Y., Nov. 2014

プラズマ装置におけるトリチウム輸送ダイナミクスの解明
湯山健太; 小林真; 内村大道; 戸田健介; 松山政夫; 原正憲; 日野友明; 山内有二; 信太祐二; 相良明男; 田中将裕; 芦川直子; 大矢恭久; 奥野健二, 日本原子力学会春の年会予稿集(CD-ROM), 2014, ROMBUNNO.E12, 10 Mar. 2014
Japanese

Measurements of Carbon Deposition Layers using Glow-Discharge Optical Emission Spectroscopy (GDOES)
波多野雄治; 信太祐二, 富山大学水素同位体科学研究センター研究報告, 34, 21, 30, 2014
In fusion devices with plasma-facing components manufactured from carbon-based materials, co-deposition of hydrogen isotopes and carbon takes place in regions where sputtering rate is relatively small. Fuel retention and recycling depend on properties of those deposits. Glow-discharge optical emission spectroscopy (GDOES) is one of attractive techniques to analyze chemical composition and thickness of these deposition layers. However, influence of hydrogen content on sputtering of these layers by glow-discharge plasma is not fully understood. In this study, two different types of carbon layer with quite different hydrogen content were deposited on stainless steel substrate, and sputtering rate during the GDOES measurement was examined for better interpretation of results obtained., 富山大学水素同位体科学研究センター, English

Effects of Helium Bombardment on Hydrogen Retention in F82H Steel
Ashikawa N.; Hirooka Y.; Zhou H.; Muroga T.; Konishi A.; Yamauchi Y.; Nobuta Y.; Yoshida N., Nov. 2013

プラズマ排ガス中の不純物量と重水素回収効率に関する研究
田口僚久; 戸田健介; 松山政夫; 原正憲; 日野友明; 山内有二; 信太祐二; 相良明男; 田中将裕; 芦川直子; 大矢恭久; 奥野健二, 日本原子力学会春の年会予稿集(CD-ROM), 2013, ROMBUNNO.K12, 11 Mar. 2013
Japanese

Study on the impurities effects for the recovery of deuterium evacuated from the plasma device
Taguchi Tomohisa; Ashikawa Naoko; Oya Yasuhisa; Okuno Kenji; Toda Kensuke; Matsuyama Masao; Hara Masanori; Hino Tomoaki; Yamauchi Yuji; Nobuta Yuji; Sagara Akio; Tanaka Masahiro, Proceedings of Annual / Fall Meetings of Atomic Energy Society of Japan, 2013, 0, 604, 604, 2013
核融合炉に燃料として導入された水素同位体のほとんどは、プラズマ中で燃焼せずそのまま排気される。そのため水素同位体の燃料リサイクリングの観点から核融合炉の確立にむけ、水素同位体の回収・精製効率に関して詳細に議論する必要がある。当研究室では、実験室規模の知見から実機における水素同位体の移行挙動を明らかにするために、水素同位体ダイナミックス解明装置（EXPRESS）を設計・作成している。本研究では、プラズマ曝露部より排気された重水素ガスを回収、加熱した水素吸蔵合金（ST2002）を用いた重水素ガスの一次純化、Pd膜水素高純度精製装置による一次純化重水素ガスのさらなる高純化、水素吸蔵合金（ZrCo）による貯蔵、という一連の処置を行う装置を作成し、その装置の重水素純化の効率を測定し、重水素回収に及ぼす不純物影響に関して議論を行う。, 一般社団法人日本原子力学会, Japanese

水素・ヘリウム同時照射後の低放射化フェライト鋼の水素リテンション
小西徹; 芦川直子; 山内有二; 信太祐二; 日野友明, 核融合エネルギー連合講演会予稿集, 9th (CD-ROM), ROMBUNNO.29A-61P, 2012
Japanese

タングステン材料の重水素保持脱離挙動
二瓶直人; 日野友明; 山内有二; 信太祐二; 大矢恭久; 奥野健二; 上田良夫, 核融合エネルギー連合講演会予稿集, 9th (CD-ROM), ROMBUNNO.28A-84P, 2012
Japanese

マテリアルプローブによるLHDのプラズマ壁相互作用の評価
重村卓哉; 山内有二; 信太祐二; 日野友明; 芦川直子; 相良明男; 西村清彦, 核融合エネルギー連合講演会予稿集, 9th (CD-ROM), ROMBUNNO.28A-15P, 2012
Japanese

スイープガス曝露によるリチウムタイタネート(Li₂TiO₃)からの重水素除去
信太祐二; 土谷晃史; 山内有二; 日野友明; 榎枝幹男; 秋場真人, 核融合エネルギー連合講演会予稿集, 9th (CD-ROM), ROMBUNNO.29A-95P, 2012
Japanese

各種タングステンの重水素保持脱離挙動
二瓶直人; ARMANDO Marco; 日野友明; 山内有二; 信太祐二; 大矢恭久; 奥野健二; 上田良夫, 日本原子力学会北海道支部研究発表会講演要旨集, 30th, 1, 2, 2012
Japanese

LHDにおける炭素堆積層評価および水素同位体保持特性に関する研究
芦川直子; 深山健介; 浜地志憲; 鳥養祐二; 山内有二; 信太祐二; 日野友明; 上田良夫; 松山政夫, 核融合エネルギー連合講演会予稿集, 9th (CD-ROM), ROMBUNNO.29A-48P, 2012
Japanese

ヘリウム照射後の核融合炉ブランケット用SiC/SiC複合材料の水素保持・脱離特性
信太祐二; 山内有二; 日野友明; YOON Han‐Ki, 真空に関する連合講演会講演予稿集, 52nd, 17, 16 Nov. 2011
Japanese, Summary national conference

大型ヘリカル装置第13サイクル実験におけるガス保持及び不純物堆積のトロイダル分布
篠田直幸; 芦川直子; 信太祐二; 山内有二; 日野友明; 増崎貴; 相良明男, 日本原子力学会北海道支部研究発表会講演要旨集, 29th, 3, 4, 2011
Japanese

重水素アーク放電によるスリット間で生成した同時堆積炭素膜の重水素濃度
金澤潤; 信太祐二; 山内有二; 日野友明; 横山堅二; 鈴木哲; 江里幸一郎; 榎枝幹男; 秋場真人, 日本原子力学会北海道支部研究発表会講演要旨集, 29th, 9, 10, 2011
Japanese

スイープガス曝露によるリチウムタイタネートの重水素除去
土谷晃史; 日野友明; 山内有二; 信太祐二; 秋場真人; 榎枝幹男, 日本原子力学会北海道支部研究発表会講演要旨集, 29th, 7, 8, 2011
Japanese

大型ヘリカル装置における炭素‐水素共堆積膜中の水素濃度
深山健介; 芦川直子; 信太祐二; 山内有二; 日野友明; 増崎貴; 西村清彦; 相良明男, 日本原子力学会北海道支部研究発表会講演要旨集, 29th, 11, 12, 2011
Japanese

核融合炉ブランケット用SiC/SiC複合材料の燃料水素保持特性
信太祐二; 山内有二; 日野友明; CHO Ho‐Jun; YOON Han‐Ki, 表面科学学術講演会講演要旨集, 30th, 33, 04 Nov. 2010
Japanese, Summary national conference

炭素同時堆積膜及びタングステンのトリチウム吸蔵
信太祐二; 金澤潤; 山内有二; 日野友明; 赤丸悟士; 波多野雄治; 松山政夫; 横山堅二; 鈴木哲; 江里幸一郎; 榎枝幹男; 秋場真人, 電気化学会大会講演要旨集, 77th, 376, 26 Mar. 2010
Japanese, Summary national conference

重水素アーク放電によりギャップ側面に堆積した炭素膜の重水素濃度
信太祐二; 金澤潤; 山内有二; 日野友明; 横山堅二; 鈴木哲; 江里幸一郎; 榎枝幹男; 秋場真人, 核融合エネルギー連合講演会予稿集, 8th (CD-ROM), ROMBUNNO.11A-80P, 2010
Japanese, Summary national conference

LHDの主放電及びグロー放電プラズマに曝露されたボロン膜及びチタン膜の不純物堆積とガス保持量
篠田直幸; 芦川直子; 信太祐二; 山内有二; 日野友明; 増崎貴; 相良明男, 日本原子力学会北海道支部研究発表会講演要旨集, 28th, 3, 4, 2010
Japanese

ヘリウムガス曝露によるリチウムタイタネートの重水素除去
土谷晃史; 山内有二; 信太祐二; 日野友明, 日本原子力学会北海道支部研究発表会講演要旨集, 28th, 9, 10, 2010
Japanese

LHD第12サイクルプラズマに曝されたマテリアルプローブ解析
松永陽子; 芦川直子; 信太祐二; 山内有二; 日野友明; 増崎貴; 相良明男, 日本原子力学会北海道支部研究発表会講演要旨集, 28th, 1, 2, 2010
Japanese

低エネルギー水素イオン照射後の低放射化フェライト鋼の重水素保持脱離挙動
山内有二; 伊藤達哉; 日野友明; 信太祐二; 柴山環樹; 江里幸一郎; 鈴木哲; 秋場真人, 核融合エネルギー連合講演会予稿集, 8th (CD-ROM), ROMBUNNO.10A63P, 2010
Japanese, Summary national conference

小型グロー放電装置を用いたアクリル樹脂等MEMS材料の親水化
中山伸弘; 信太祐二; 山内有二; 日野友明, 真空に関する連合講演会講演予稿集, 50th, 130, 04 Nov. 2009
Japanese, Summary national conference

電解液溶媒を吸着させたLiイオン二次電池用黒鉛負極材料のガス放出特性
渡邉俊智; 信太祐二; 山内有二; 日野友明; 久保田良博; 大関克知, 真空に関する連合講演会講演予稿集, 50th, 138, 04 Nov. 2009
Japanese, Summary national conference

核融合炉第一壁候補材料に対する水素同位体の保持脱離挙動
木村友基彦; 日野友明; 山内有二; 信太祐二, 日本原子力学会北海道支部研究発表会講演要旨集, 27th, 28, 29, 2009
Japanese

低エネルギー水素イオンを照射したF82H鋼の重水素保持脱離挙動
伊藤達哉; 信太祐二; 山内有二; 日野友明; 柴山環樹; 江里幸一朗; 鈴木哲; 秋場真人, 日本原子力学会北海道支部研究発表会講演要旨集, 27th, 26, 27, 2009
Japanese

LHD中に堆積した同時堆積炭素膜の水素濃度
濱竜太; 信太祐二; 山内有二; 日野友明; 芦川直子; 増崎貴; 相良明男; 西村清彦; 大藪修義; 小森彰夫; 本島修, 日本原子力学会北海道支部研究発表会講演要旨集, 27th, 30, 31, 2009
Japanese

酸素グロー放電によるステンレス鋼表面及び黒鉛からの炭素除去
野村拓也; 信太祐二; 山内有二; 日野友明, 日本原子力学会北海道支部研究発表会講演要旨集, 25th, 6, 7, 10 Dec. 2007
Japanese

23aB01 Material Probe Analysis for Plasma Facing Surface of LHD
HINO Tomoaki; ASHIKAWA Naoko; NOBUTA Yuji; SAGARA Akio; MASUZAKI Suguru, プラズマ・核融合学会年会予稿集, 0, 21, 89, 89, Nov. 2004
社団法人プラズマ・核融合学会, Japanese, Summary national conference

23aB29P Material probe analysis for boronized wall in LHD
Nobuta Yuji; Yamauchi Yuji; Hirohata Yuko; Hino Tomoaki; Ashikawa Naoko; Nishimura Kiyohiko; Sagara Akio; Masuzaki Suguru; Noda Nobuaki; Ohyabu Nobuyoshi; Komori Akio; Motojima Osamu; LHD Experimental Group, プラズマ・核融合学会年会予稿集, 0, 21, 108, 108, Nov. 2004
社団法人プラズマ・核融合学会, Japanese, Summary national conference

LHD内壁ステンレス鋼のヘリウム保持特性
信太祐二; 山内有二; 広畑優子; 日野友明; 芦川直子; 相良明男; 増崎貴; 野田信明; 小森彰夫, 真空に関する連合講演会講演予稿集, 44th, 141, 12 Nov. 2003
Japanese

26aB01P Surface probe analysis for plasma wall interactions in the Large Helical Device
Hino T; Nobuta Y; Yamauchi Y; Hirohata Y; Sagara A; Masuzaki S; Ashikawa N; Noda N; Motojima O, プラズマ・核融合学会年会予稿集, 0, 19, 67, 67, Nov. 2002
社団法人プラズマ・核融合学会, Japanese, Summary national conference

大型ヘリカル装置(LHD)第一壁の不純物堆積とガス保持特性
信太祐二; 広畑優子; 橋場正男; 山内有二; 日野友明; 増崎貴; 相良明男; 芦川直子; 本島修, 真空に関する連合講演会講演予稿集, 43rd, 15, 16, 16 Oct. 2002
Japanese

29pA07P Analysis of material probes exposed to LHD plasma during 3rd cycle campaign
NOBUTA Yuji; HIROHATA Yuko; HASHIBA Masao; YAMAUCHI Yuji; HINO Tomoaki; INOUE Noriyuki; MASUZAKI Suguru; SAGARA Akio; NODA Nobuaki; MOTOZIMA Osamu, プラズマ・核融合学会年会予稿集, 0, 18, 130, 130, Nov. 2001
社団法人プラズマ・核融合学会, Japanese, Summary national conference

■ Syllabus

機械加工学実習, 2024年, 学士課程, 工学部

一般教育演習(ﾌﾚｯｼｭﾏﾝｾﾐﾅｰ), 2024年, 学士課程, 全学教育

■ Affiliated academic society

THE VACUUM SOCIETY OF JAPAN

THE JAPAN SOCIETY OF PLASMA SCIENCE AND NUCLEAR FUSION RESEARCH

■ Research Themes

Interaction of boron film with advanced plasma facing tungsten and its hydrogen isotope dynamics
Grants-in-Aid for Scientific Research
01 Apr. 2026 - 31 Mar. 2030
大矢恭久; 増崎貴; 信太祐二
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Shizuoka University, 26K00682

パルスレーザー照射によるレニウム添加を利用したタングステンの再結晶の抑制
科学研究費助成事業
01 Apr. 2025 - 31 Mar. 2028
信太祐二
日本学術振興会, 基盤研究(C), 北海道大学, 25K07257

レーザードーピングで形成される不純物ドープ層を利用した水素ガスバリア機能の開発
科学研究費助成事業基盤研究(C)
01 Apr. 2021 - 31 Mar. 2024
信太祐二
水素の利用が広まる中で，水素容器からの水素の漏れ（透過）を防ぐ水素ガスバリア機能の重要性が高まっている。既存技術として水素透過の小さな薄膜を容器にコーティングする方法が主流になっているが，これにはクラックや剥離などの潜在的な弱点が存在する。本研究では，炭素や窒素などの不純物を表層に添加（ドープ）することにより水素の透過を抑制する新しい水素ガスバリア機能強化法の確立を目標としている。具体的な内容として，ガスバリア機能が最も向上するドープ条件と透過が抑制されるメカニズムの解明を目指す。本手法はコーティングとは違い金属表面そのもののガスバリア機能を向上させるためクラックや剥離などの問題を克服でき，コーティングができないような金属にも応用できると考えられる。
初年度はまず，レーザードーピングしたステンレス鋼表面の水素吸収特性を調べた。エタノール中にステンレス鋼試料を浸した状態でレーザー照射することにより炭素や酸素をドープした後，三重水素ガスに高温で曝露し，ドープ層の三重水素吸収量をイメージングプレート法で評価した。三重水素の検出深さは表面近傍に限られるため，ドープ層の水素吸収特性を調べるのに適している。レーザーフルエンスを0.2-1.4J/cm2で変化させた場合，0.5J/cm2の場合にもっとも三重水素吸収量が少なくなった。また，1.4J/cm2の場合はドープしていない場合とほとんど変わらず，またレーザー照射面がかなり損耗されていることがわかった。0.5J/cm2のフルエンスで照射時間を変化させたところ，照射時間が長くなるにつれてドープ効果が小さくなる傾向がみられた。これらから，ドープ層の水素吸収を低減させるレーザー照射条件をほぼ明らかにすることができた。
日本学術振興会, 基盤研究(C), 北海道大学, 21K04662

Control of vacancy concentration and hydrogen isotope retention in neutron-irradiated tungsten alloys for fusion applications
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
01 Apr. 2018 - 31 Mar. 2022
Hatano Yuji
Future fusion reactors will use deuterium (D) and tritium (T) as fuel and tungsten (W) as a wall material of reactor core. Due to their small sizes, D and T atoms are dissolved into W crystal easily. During reactor operation, W will be irradiated with high energy neutrons produced by fusion reactions, and fine cavities (vacancy and vacancy clusters) are generated in W crystal. These cavities strongly trap D and T atoms and raise T retention in W markedly. Such retention of a large amount of T increases a risk of uncontrolled T release to the environment under accidental conditions. In this study, we systematically investigated irradiation responses of W-Re, -Cr, -Ta and -Mo binary alloys. We found that Re and Cr strongly enhance the annihilation of cavities under irradiation and reduce hydrogen isotope retention in orders of magnitude. The mechanisms underlying such enhanced cavity annihilation was clarified with help of first principle calculation results in literatures.
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), University of Toyama, 18H03688