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    • Multi-scale Nonlinear Turbulence Dynamics Studies

    G. R. Tynan,P. H. Diamond,O. Gurcan,C. Holland,S. H. Muller,M. Xu,Z. Yan,J. Yu,P. Manz,M. Ramisch,U. Stroth,Y. Nagashima,S. I. Itoh,M. Yagi,S. Inagaki,A. Fujisawa,N. Kasuya,K. Itoh,T. Windisch,O. Grulke,T. Klinger

    semanticscholar（2008）

    Cited 0|Views8
    Abstract
    Critical gradient transport dynamics, breaking of gyro-Bohm transport scaling, transport bifurcation, and transport barrier formation all have a profound effect on confinement in magnetic fusion devices, and are thought to be both generated and regulated by the nonlinear interaction between gradient-driven small scaled ( k!"s <1) drift turbulence and larger meso-scaled structures such as zonal flows and streamers with k!"s << 1 [1, 2] that are generated from the turbulence. Zonal flow formation from turbulence, regulation of the turbulence by the zonal flow, effects of flow damping rate on turbulence saturation, and introduction of device-scaled transport events due to the breakdown of zonal flows and formation of propagating structures are the key nonlinear physics processes that lead to these macroscopic confinement properties. Direct study of the underlying physics requires simultaneous spatiotemporal turbulence measurements that cannot be made in existing large confinement devices. Suitably designed and diagnosed smaller laboratory experiments such as the TJ-K toroidal device and the CSDX, VINETA, and LMD linear devices have recently provided direct experimental study of these issues, and thus provide a detailed stress test of theory and simulation.
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    【要点】：本文研究了梯度驱动的小尺度漂移湍流与较大尺度结构（如带状流和喷流）之间的非线性相互作用对磁约束聚变装置中约束性能的影响，提出了关键的非线性物理过程及其对宏观约束特性的作用。
    

    【方法】：通过分析梯度驱动小尺度漂移湍流和较大尺度结构的非线性相互作用，研究了临界梯度输运动力学、输运分岔和输运屏障形成等关键现象。
    

    【实验】：在TJ-K环状装置以及CSDX、VINETA和LMD线性装置等小型实验设备上进行了直接的实验研究，验证理论和模拟的准确性。
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