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2020 Fiscal Year Final Research Report

Study on hydrogen isotope behavior in fusion test device using tracer tritium by D-D reaction

Research Project

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Project/Area Number 17K06998
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Nuclear fusion studies
Research InstitutionNational Institute for Fusion Science

Principal Investigator

Tanaka Masahiro  核融合科学研究所, ヘリカル研究部, 准教授 (00435520)

Project Period (FY) 2017-04-01 – 2021-03-31
Keywordsトリチウム挙動 / 物質収支 / 化学形態 / プラズマ対向壁材 / 赤外吸収分光計測
Outline of Final Research Achievements

The hydrogen isotope behavior in a large fusion test facility was evaluated for four years using tritium produced by D-D reaction as a tracer. As the results, it was found that: 1. 56% of the produced tritium remained in the vacuum vessel at the end of the fourth year of the deuterium plasma experiment; 2. the tritium release from the vacuum vessel was rate-limiting due to the isotope exchange reaction and tritium diffusion in the material; 3. the chemical form of the released tritium was molecular (Q2) >> hydrocarbon (CxQy) > water vapor (Q2O); 4. The exhaust gas composition was analyzed by infrared absorption spectroscopy, and deuterated hydrocarbons (CxHyDz), carbon monoxide, and ammonia were observed. The present study clarified the tritium balance in the fusion system and the complex behavior of the exhaust gas.

Free Research Field

核融合科学

Academic Significance and Societal Importance of the Research Achievements

大型核融合試験装置の重水素実験で生成される極僅かのトリチウムをトレーサー(追跡子)として利用することで、核融合装置内外の水素同位体挙動を明らかにすることができました。さらに、核融合装置内から排出されるトリチウムは、さまざまな化学形態として存在すること、水素同位体交換反応と材料内での拡散速度に律速されていることを明らかにしました。この研究成果は、将来の核融合炉で燃料として使用されるトリチウムの安全取り扱いや、燃料を処理し再利用する循環システムに関する重要な知見となります。

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Published: 2022-01-27  

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