2013 Fiscal Year Final Research Report
Study of the directionality on the redeposition layer in fusion devices
| Project/Area Number |
23656579
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Nuclear fusion studies
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| Research Institution | National Institute for Fusion Science |
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Principal Investigator |
MASUZAKI Suguru 核融合科学研究所, ヘリカル研究部, 准教授 (80280593)
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| Co-Investigator(Renkei-kenkyūsha) |
TOKITANI Masayuki 核融合科学研究所, ヘリカル研究部, 助教 (30455208)
KOBAYASHI Masahiro 核融合科学研究所, ヘリカル研究部, 准教授 (30399307)
OHNO Noriyasu 名古屋大学, 大学院・工学研究科, 教授 (60203890)
WATANABE Hideo 九州大学, 応用力学研究所, 准教授 (90212323)
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| Project Period (FY) |
2011 – 2013
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| Keywords | プラズマ・壁相互作用 / LHD / 材料輸送 / 堆積層 / 方向性 / QUEST / EDX / グロー放電発光分析法 |
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| Research Abstract |
Material migration in the vacuum vessel of fusion devices is a crucial issue because it strongly affect the lifetime of plasma facing components and hydrogen isotope retention. In this study, I focused on the "directionality" to understand the mechanism of the redeosition layer formation. I designed the "directional material probe" which consists of the disk on which deposition layer is formed and the pin which makes shadow on the deposition layer if the deposits come to the probe with directionality. The probes were installed in LHD in NIFS and QUEST in Kyushu university. In LHD, it was revealed that the effects of plasma flow on the redeposition layer formation is weak. Carbon and iron are the main components of the in-vessel components of LHD. It was observed by the analysis of the probes that the deposition mechanism of them is same at some places and is different at the other places.
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