Novel turbulence trigger for neoclassical tearings mode in tokamaks.
Novel turbulence trigger for neoclassical tearings mode in tokamaks.
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DOI：
10.1103/physrevlett.91.045003
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发表时间：
2003-07
影响因子：
8.6
通讯作者：
S. Itoh;K. Itoh;M. Yagi
中科院分区：
文献类型：
--
作者：
S. Itoh;K. Itoh;M. Yagi
研究了新经典撕裂模(NTM)的微湍流随机触发。NTM引起了磁结构的拓扑变化，具有亚临界性质。得到了NTM的概率密度函数的转移率和统计平均幅度。相图中的边界被确定为转变条件的统计长时间平均值。即使在没有其他全球不稳定的情况下，NTM也可以通过越过这一边界而兴奋。
A stochastic trigger by microturbulence for a neoclassical tearing mode (NTM) is studied. The NTM induces a topological change of magnetic structure and has a subcritical nature. The transition rate of the probability density function for and statistically averaged amplitude of the NTM are obtained. The boundary in the phase diagram is determined as the statistical long time average of the transition conditions. The NTM can be excited by crossing this boundary even in the absence of other global instabilities.