| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
In magnetically confined fusion reactors, energetic ions are periodically exhausted from confinement region and transported into divertor region. Detached divertor is sustained by plasma volumetric recombination. So there is a concern that reaction rate of volumetric recombination is decreased by periodic energetic ion inflow. But such study has not been conducted enthusiastically. We performed ion beam injection experiments using the DT-ALPHA device and an ion beam generator to simulate transient divertor plasma behavior. It was confirmed that energetic ions could change production and extinction rates of excited hydrogen atoms and molecules. In addition, we developed electron and ion diagnostic techniques. It was demonstrated that the Boltzmann plot method considerably underestimates both electron temperature and electron density when it is utilized for non-Maxwellian plasma diagnostics. This results in overestimation of volumetric recombination rate in divertor plasma.
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