2010 Fiscal Year Final Research Report
Generation mechanism and nonlinear dynamics of zonal modes in Alfvenic wave flucutations
| Project/Area Number |
19560828
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | Kyoto University |
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Principal Investigator |
LI Jiquan Kyoto University, エネルギー科学研究科, 准教授 (00437253)
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| Co-Investigator(Kenkyū-buntansha) |
KISHIMOTO Yasuaki 京都大学, エネルギー科学研究科, 教授 (10344441)
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| Project Period (FY) |
2007 – 2010
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| Keywords | プラズマ閉込め / 安定性と乱流 / 帯状流モード / 乱流輸送 / アルフェン波 / ジャイロ流体モデル / 簡約化MHDモデル / シミュレション |
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| Research Abstract |
Zonal mode physics including convective cells in electromagnetic (EM) plasmas in a framework of nonlinear Alfven wave theory has been investigated based on gyrofluid simulations of multi-scale EM turbulence. Main findings are summarized as (1) the spectral characteristics of micro-turbulence is significantly modified by the feedback reaction of zonal flows including the GAMs and the secondary low-frequency long wavelength structures through the spectral scattering via nonlinear mode coupling ; (2) Larger magnetic island including the zonal fields induces a new global-type short wavelength ion-scale instability due to the collapse of ion temperature island involving the zonal temperature dynamics ; (3) A concept of cross-scale dynamo action is proposed as an alternative of the anomalous resistivity theory for fast magnetic reconnection ; (4) The zonal pressure corrugation can lead a bursty turbulent transport via nonlocal mode coupling.
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