| Budget Amount *help |
¥25,350,000 (Direct Cost: ¥19,500,000、Indirect Cost: ¥5,850,000)
Fiscal Year 2009: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2008: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
Fiscal Year 2007: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
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| Research Abstract |
In the fusion reactor, tungsten materials are considered to use as the plasma facing materials and it is thought that tungsten carbide will be formed. Therefore, it is important issue for fusion safety to reveal the tritium behavior changes. In this study, carbon ion (C^+), helium ion (He^+) and deuterium ion (D_2^+) were implanted into tungsten on various conditions, and the retention behavior of deuterium was clarified. As a result, it was shown that irradiation defects ware formed by carbon ion implantation and the deuterium retention behavior was changed by carbon retained in tungsten. In addition, it was suggested that the irradiation defects also formed by helium ion irradiation and deuterium retention increased. For the triple ions (C^+, He^+ and D_2^+) implantation into tungsten, it was shown that the deuterium was mainly trapped on irradiation defects formed by helium ion implantation. Moreover, the carbon-carbon bond on tungsten surface was decreased compared to that in the dual ion (C^+ and D_2^+) case. It was suggested that carbon was sputtered by helium ion implantation and the helium retention would have an influence on diffusion of hydrogen isotopes to bulk..
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