| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
Vacuum ultraviolet (VUV) spectra of line emissions from tungsten ions at lower ionization stages have been measured in the Large Helical Device (LHD) using a 3m normal incidence spectrometer. It was found that W VI lines at the wavelengths of 605.926 (5d-6p), 639.683 (5d-6p), 677.722 (5d-6p), 1168.151 (6s-6p) and 1467.959 (6s-6p) Angstrom are emitted with extremely high intensity and entirely isolated from other intrinsic impurity line. The result strongly suggests that those lines may be useful for the spectroscopic study in ITER and other magnetic fusion devices with tungsten materials as the plasma facing component.
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