| Budget Amount *help |
¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
In the H-mode plasmas where the confinement is improved by the edge transport barrier in tokamak devices, the influence of hydrogen isotope mass on the plasma confinement has been investigated. The large-scale correlation between the edge and core plasmas has also been quantified. The increase of hydrogen isotope mass leads to the confinement improvement because the increase of the Shafranov shift due to the larger core pressure at heavier isotope stabilizes the edge plasmas. Then, the effects of Shafranov shift and plasma shape on the edge plasma structure have been assessed using JET and JT-60U. In particular, the increase of core pressure at high triangualrity and low elongation resulted in the reduction of edge pressure gradient due to the destabilization of the pressure-driven mode whereas the wider pedestal was formed so that the edge pressure was kept high enough.
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