| Budget Amount *help |
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2013: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2012: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2011: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
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| Outline of Final Research Achievements |
In fusion plasmas, radial ion heat transport driven by ion temperature gradient (ITG) instability is considered to be dominant. Here we have observed ITG-like fluctuations and developed analysis method for evaluating a fluctuation-driven heat transport in the linear plasma device. The main results are the following: (1) We calculated the linear growth rate of ITG modes by a three-field fluid model and found unstable domain. Then we have succeeded to observe a fluctuation propagating in the ion diamagnetic drift direction, which co-exists with drift waves propagating in the electron diamagnetic drift direction. (2) We developed a conditional sampling method and succeeded to extract the ion temperature fluctuation amplitude synchronized with the floating potential fluctuation. In addition, we improved the method and observed the phase difference between temperature and potential fluctuations, which allows us to evaluate the fluctuation-driven heat flux.
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