Characterization of Unipolar Arcing Initiated on Materials Exposed to Helium Plasmas
Project/Area Number |
23686133
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Research Category |
Grant-in-Aid for Young Scientists (A)
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Allocation Type | Single-year Grants |
Research Field |
Nuclear fusion studies
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Research Institution | Nagoya University |
Principal Investigator |
KAJITA Shin 名古屋大学, エコトピア科学研究所, 准教授 (00455297)
|
Project Period (FY) |
2011-04-01 – 2015-03-31
|
Project Status |
Completed (Fiscal Year 2014)
|
Budget Amount *help |
¥27,820,000 (Direct Cost: ¥21,400,000、Indirect Cost: ¥6,420,000)
Fiscal Year 2013: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2012: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2011: ¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
|
Keywords | ナノ構造 / タングステン / アーキング / 核融合 / ヘリウムプラズマ / プラズマ / ヘリウム照射 |
Outline of Final Research Achievements |
To investigate the influence of arcing in the nuclear fusion reactor, experiments were conducted to reveal the effect and conditions of arcing. Material properties of nanostructured tungsten (W) was evaluated, and the influence of arcing in a large experimental reactor JT-60U was investigated. To discuss the initial process of arcing, the effects of helium irradiation on the field electron emission characteristics were experimentally investigated. The motion and the temperature of the generated plasma around the cathode spot were revealed from analysis of arc trail and spectroscopic measurement. The temperature was ~0.8 eV, and the fractal feature of arc spot motion was revealed. In addition, it was shown that the erosion rate of W was about 0.1 mg/C on the nanostructured W.
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Report
(4 results)
Research Products
(39 results)
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[Presentation] Revival of Arcing Issue in Fusion Reactors2011
Author(s)
S.Kajita, N.Ohno, S.Takamura, M.Tokitani, S.Masuzaki, N.Yoshida, T.Hatae, M.Fukumoto, K.Itami, T.Nakano, Y.Ueda
Organizer
PLASMA2011
Place of Presentation
石川県立音楽堂(招待講演)
Related Report
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[Presentation] Recent Progress of Tungsten R&D for Fusion Application in Japan2011
Author(s)
Y.Ueda, H.T.Lee, N.Ohno, S.Kajita, A.Kimura, R.Kasada, T.Nagasaka, Y.Hatano, A.Hasegawa, H.Kurishita
Organizer
13th International Workshop on Plasma-Facing Materials and Components for Fusion Applications and 1st International Conference on Fusion Energy Materials Science
Place of Presentation
ローゼンハイム(ドイツ)
Related Report
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