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Excitation of geodesic acoustic modes by ion temperature gradient modes

机译:离子温度梯度模激发测地声模

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Geodesic acoustic modes (GAMs) can be excited by mode coupling to primary modes such as the drift waves and ion temperature gradient modes in tokamak plasmas. Recent global numerical simulations of ion temperature gradient modes show excitation of GAMs and indicate that the radial wave-number of the excited GAMs scales inversely as the ion Larmor radius. Also the modes are excited dominantly in the edge region of the device. Furthermore there is a nonlinear downshift of the GAM frequency compared with the predicted linear mode frequency. The mode-coupling analysis presented in this paper provides an explanation of the scaling of the radial wave-number, the preferential excitation of GAMs in the outer half of the plasma and the nonlinear downshift of the frequency of GAMs.
机译:测地线声模(GAM)可以通过耦合至主要模式(例如托卡马克等离子体中的漂移波和离子温度梯度模式)的模式来激发。离子温度梯度模式的最新全局数值模拟显示了GAM的激发,并表明激发的GAM的径向波数与离子拉莫尔半径成反比。而且,模式主要在器件的边缘区域被激发。此外,与预测的线性模式频率相比,GAM频率存在非线性降档。本文提出的模式耦合分析提供了对径向波数缩放,等离子外半部中GAM的优先激发以及GAM频率的非线性下移的解释。

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