2013 Fiscal Year Final Research Report
Investigation of mechanisms of hydrogen retention in tungsten coating layers simultaneously irradiated by hydrogen and carbon ions
| Project/Area Number |
24760710
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Nuclear fusion studies
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| Research Institution | Japan Atomic Energy Agency |
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Principal Investigator |
FUKUMOTO Masakatsu 独立行政法人日本原子力研究開発機構, 核融合研究開発部門 那珂核融合研究所, 研究員 (60549202)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | プラズマ・核融合 / 被覆タングステン / トリチウムリテンション / 炭素 |
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| Research Abstract |
Mechanisms of hydrogen retention in tungsten coating layers have been investigated with a mixed deuterium and carbon ion beam irradiation including a carbon ion fraction of up to 3.2%. For the irradiation temperature of 500 K, injected deuterium atoms are retained at intrinsic defects and carbon atoms accumulated in the tungsten coating layer. For the irradiation temperature of 700 K, injected deuterium atoms are retained at carbon atoms accumulated in the tungsten coating layer, and the deuterium atoms are chemically bonded with the carbon atoms, forming C-D bonds. Most of the accumulated deuterium atoms desorb in the form of hydrocarbon molecules by heating of the tungsten coating layer. This leads to removal of the accumulated carbon atoms from the tungsten coating layer in addition to the retained deuterium atoms.
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