| Project/Area Number |
25820443
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Nuclear fusion studies
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| Research Institution | Japan Atomic Energy Agency |
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Principal Investigator |
Bierwage Andreas 国立研究開発法人日本原子力研究開発機構, 核融合研究開発部門 六ヶ所核融合研究所, 研究副主幹 (10584691)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Keywords | 核融合学 / トカマク / 高エネルギーイオン / アルフベン波 / 波・粒子共鳴 / マルチ時間スケール動力学 / 非線形シミュレーション / 核融合 / Nuclear fusion / Tokamak / Energetic ions / Alfven waves / Wave-particle resonances / Multi-timescale dynamics / Nonlinear simulations |
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| Outline of Final Research Achievements |
A combination of integrated and self-consistent multi-time-scale simulations of beam-driven JT-60 tokamak plasmas were performed on the high-performance supercomputer Helios. These simulations reproduced, for the first time, experimentally observed relaxations known as Abrupt Large Events (ALE), which play an important role in the regulation of nuclear fusion performance and plasma confinement. An analysis of the results revealed key physics mechanisms that determine the intervals between ALEs and their sudden onset. In particular, the duration of the intervals is determined by collisional slow-down of energetic ions and wave-particle resonance conditions. The overlap of resonances associated with three distinct magnetohydrodynamic (MHD) modes is proposed as a key component of the ALE trigger mechanism. The numerical results were successfully validated against experimental data, which helps to build confidence in their relevance and reliability as needed for making predictions.
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