The interplay between toroidal drift-wave turbulence and tokamak profiles is investigated using a wave-kinetic description. The coupled system is used to investigate the interplay between marginally stable toroidal drift-wave turbulence and geodesic acoustic modes (GAMs). The coupled system is found to be unstable. Notably, the most unstable mode corresponds to the resonance between the turbulent wave radial group velocity and the GAM phase velocity. For a low-field-side ballooned drift-wave growth, a background flow shear breaks the symmetry between inwards- and outwards-travelling instabilities. Although this turbulence–GAM coupling may not be the primary driver for avalanches in standard core ion temperature gradient simulations, this mechanism is generic and displays many of the expected features, and should be of interest in several other regimes, which include towards the edge or in the presence of energetic particles.

中文翻译：

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使用环形几何中的波动力学公式研究托卡马克湍流雪崩

使用波动力学描述研究了环形漂移波湍流和托卡马克剖面之间的相互作用。耦合系统用于研究边缘稳定的环形漂移波湍流与测地线声学模式 (GAM) 之间的相互作用。耦合系统被发现是不稳定的。值得注意的是，最不稳定的模式对应于湍流径向群速度和 GAM 相速度之间的共振。对于低场侧膨胀的漂移波增长，背景流剪切破坏了向内和向外传播的不稳定性之间的对称性。虽然这种湍流-GAM 耦合可能不是标准核心离子温度梯度模拟中雪崩的主要驱动因素，但这种机制是通用的，并显示出许多预期的特征，