Generation mechanism and nonlinear dynamics of zonal modes in Alfvenic wave flucutations

阿尔芬尼波脉动中纬向模态的产生机制及非线性动力学

• 批准号: 19560828
• 负责人: LI Jiquan
• 金额: $ 2.83万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19560828/
• 关键词: 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

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.

基于多尺度电磁湍流的回旋流体模拟，在非线性Alfven波理论框架下研究了电磁等离子体中包含对流单元的带状模物理。主要研究结果如下：（1）纬向流场（包括大气湍流和次级低频长波结构）通过非线性模式耦合的光谱散射反馈作用，显著改变了微湍流的光谱特性;（2）较大的磁岛（包括纬向场）诱导了一种新的全球型短波长离子-（3）提出了跨尺度发电机作用的概念，作为快速磁场重联反常电阻率理论的替代;（4）纬向气压场通过非局域模耦合导致湍流的突发性输运。

项目成果

Remote collaboration system based on large scale simulation

基于大规模仿真的远程协作系统

• 发表时间: 2008
• 期刊: Fusion Engineering and Design Vol.83
• 作者: Y.Kishimoto;A.Sugahara;J.Q.Li
• 通讯作者: J.Q.Li

Multi-scale turbulence interaction through cross-scale dynamo generation by micro-scale turbulent flow in plasmas

通过等离子体中微尺度湍流产生跨尺度发电机的多尺度湍流相互作用

• 发表时间: 2010
• 作者: T. Matsumoto;J. Q. Li;Y. Kishimoto;Jiquan Li
• 通讯作者: Jiquan Li

Cross-scale dynamo action in multi-scale plasma turbulence

多尺度等离子体湍流中的跨尺度发电机作用

• 发表时间: 2010
• 期刊: Plasma and Fusion Research Vol.5
• 作者: Jiquan Li;Y.Kishimoto
• 通讯作者: Y.Kishimoto

Multi-scale turbulence simulation in magnetic fusion plasma

磁聚变等离子体中的多尺度湍流模拟

• 发表时间: 2010
• 作者: T. Matsumoto;J. Q. Li;Y. Kishimoto;Jiquan Li;Y.Kishimoto;Jiquan Li;Yasuaki Kishimoto;Jiquan Li
• 通讯作者: Jiquan Li

Nonlinear Interaction Mechanisms of Multi-scale Multi- mode MHD and Micro-turbulence in Magnetic Fusion Plasmas

磁聚变等离子体多尺度多模MHD与微湍流的非线性相互作用机制

• 发表时间: 2010
• 作者: T. Matsumoto;J. Q. Li;Y. Kishimoto;Jiquan Li;Y.Kishimoto;Jiquan Li;Yasuaki Kishimoto;Jiquan Li;Jiquan Li
• 通讯作者: Jiquan Li