| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
In order to determine the electron density and temperature in fusion-relevant divertors and in divertor-simulating plasma facilities, the so-called "intensity ratio technique" of atomic helium line (He I) based on a collisional-radiative (CR) model has widely been used. Researchers have now recognized that the CR model will not give a correct answer unless the radiation trapping process between resonant singlet-P states and the ground state 1S is taken into consideration properly in low-temperature plasmas. I this research, we proposed a noble approach to measure the population of the single 2P states, by using a near infrared (NIR) radiative transition of singlet 2S-2P at 2058.130 nm. We developed a NIR spectrometer and success in measuring the line of interest in the MAP-II divertor simulator. The spatial distribution of the line exhibited a significant broadening in the spatial distribution, which indicates the effect of radiation trapping for the resonant state.
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