Bicoherence in electrostatic turbulence driven by high magnetohydrodynamic activity in Tokamak Chauffage Alfvén Brésilien
Bicoherence in electrostatic turbulence driven by high magnetohydrodynamic activity in Tokamak Chauffage Alfvén Brésilien
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DOI：
10.1063/1.3099701
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发表时间：
2009-04
影响因子：
2.2
通讯作者：
G. Z. D. S. Lima;Z. Guimarães-Filho;A. Batista;I. Caldas;S. R. Lopes;R. Viana;I. C. Nascimento;Y. Kuznetsov
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文献类型：
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作者：
G. Z. D. S. Lima;Z. Guimarães-Filho;A. Batista;I. Caldas;S. R. Lopes;R. Viana;I. C. Nascimento;Y. Kuznetsov
在托卡马克的某些放电过程中，M. O. Galvao等人，Plasma Phys.Controlled Fusion 43，1181（2001）]高磁流体动力学活性可以出现在峰值频谱中。每当这个峰值出现时，周围的宽带静电湍流被显着修改，同步到主导的磁波动频率，并呈现高的双相干在整个等离子体边缘与最大的双相干内的等离子体。引入一个唯象模型来研究这种驱动的湍流双相干，由非线性耦合的相位随机漂移模式与时间周期性的外部驱动在主导的磁场波动频率。该模型的双相干谱能很好地模拟实验结果的特征。
During some discharges in Tokamak Chauffage Alfven Bresilien [R. M. O. Galvao et al., Plasma Phys. Controlled Fusion 43, 1181 (2001)] high magnetohydrodynamic activity may appear with a peaked frequency spectrum. Whenever this peak occurs, the ambient broadband electrostatic turbulence is remarkably modified, synchronizing into the dominant magnetic fluctuation frequency and presenting high bicoherence in the whole plasma edge with a maximum bicoherence inside the plasma. A phenomenological model is introduced to investigate this driven turbulence bicoherence, consisting of nonlinearly coupled phase-randomized drift modes with time-periodic external driving at the dominant magnetic fluctuation frequency. The bicoherence spectrum of this model can mimic features of the experimental results.