| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2010: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2009: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Research Abstract |
Helium plasma irradiation has been conducted in the divertor simulator NAGDIS. Typical plasmas used for the irradiation are the electron density of 10^<18>m^-3> and the temperature of 5 eV. For the nanostructure on W, parametric dependence of the formation of the nanostructure has been extensively investigated and found that the fuzz structure is formed when the surface temperature was in the range of 1000-2000 K and the incident ion energy s higher than ~20-30 eV.
Furthermore, it is shown that the roughed metals by helium irradiation significantly increase the optical absorptivity, and can be a good medium for an optical absorber medium. The optical reflectivity decreased two orders of magnitude, making it the darkest man-made tungsten, which could be used in high temperature circumstances. The results indicate that the helium irradiated metals can be a good medium for light absorber.
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