| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2019: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| 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.
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