| Budget Amount *help |
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Fiscal Year 2016: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
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| Outline of Final Research Achievements |
The excessive heat load in the divertor area, where the high temperature plasma attaches to the vacuum wall, is a major concern which prevents realization of nuclear fusion power plants. For solving this issue, the reduction of the heat load was investigated using intrinsic dust particles which are composed of small carbon and metal grains in the vacuum vessel. Experiments for realizing the heat load reduction were performed using an impurity powder dropper (IPD) which were installed at an upper port of the Large Helical Device (LHD). Though it resulted in the successful reduction of the heat load in some divertor areas, the experiments revealed that the stable sustainment of plasma discharges is difficult. The experimental results indicate that the local supply of dust particles to the divertor areas can be effective for the stable sustainment of the plasma discharges.
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