Edge localized modes (ELMs) remain a critical issue for the lifetime of in-vessel components of fusion reactors such as ITER. We study ELMs triggered when the pedestal parameters are below the peeling-ballooning limit. These ELMs occur while the pedestal recovers after an ELM crash. We identify a mechanism by which a non-linear perturbation involving many active triads—a network of non-linear interactions – leads to the triggering of these ELMs. Each active triad leads to the non-linear transfer of energy between three waves, such that the network of non-linear interactions lead to a transfer of energy between many waves. The triggering of this non-linear perturbation systematically coincides with a pedestal perturbation induced by the neutral beam injection beams and localized near the magnetic surface of safety factor q = 5. Among the non-linear interactions detected during the ELM by a bi-coherence analysis, the most active triad involves a slow frequency...

中文翻译：

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将非线性相互作用的网络识别为触发边缘局部化模式发生的机制

边缘局部模式（ELM）仍然是核聚变反应堆（如ITER）容器内组件寿命的关键问题。我们研究了当基座参数低于剥离气球极限时触发的ELM。这些ELM发生在ELM崩溃后基座恢复的同时。我们确定了一种机制，通过该机制，涉及许多活动三合会的非线性扰动（非线性相互作用的网络）会导致这些ELM的触发。每个活动三重轴导致三波之间的能量非线性传递，从而非线性相互作用的网络导致许多波之间的能量传递。该非线性扰动的触发与由中性束注入束引起并位于安全系数q = 5的磁性表面附近的基架扰动系统地吻合。