| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
In order to realize high performance burning plasmas in magnetic-confinement fusion device, both bulk plasma transport and that of energetic fusion alpha-particles have to be reduced simultaneously. We investigate nonlinear multi-scale interactions between toroidal Alfven eigenmode (TAE), which is unstable at low wavenumber, and drift-wave (DW) turbulence, which is driven by micro-instabilities at high wavenumber, by means of the global gyrokinetic simulation code GKNET. We have revealed that TAE suppresses the most unstable DW mode, and the TAE transfers the energy from the most unstable DW mode to lower wavenumber modes to modulate turbulence, because the TAE has a finite wavenumber in contrast to zonal flows. This modulation of DW turbulence by TAE leads to an enhancement of energy flux of bulk ions and particle flux of energetic ions. Hence, TAE and DW turbulence synergistically enhance the transport of both bulk plasma and energetic particles
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