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High frequency MHD activity related to type I ELMs in ASDEX upgrade

机译：与ASDEX升级中的I型ELM相关的高频MHD活动

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High frequency coherent magnetic fluctuations related to the type I edge localized mode (ELM) cycle have been found in ASDEX Upgrade. Typical frequencies are in the range 300-500 kHz, and the poloidal mode number, m, measured at the outboard midplane, is estimated to be 10-15. These MHD modes are present in many low density (low collisionality) discharges, while they have not been found in high density ones yet. New findings on already known low frequency type I ELM precursors confirm that in ASDEX Upgrade type I ELM mode precursors are normally phase locked to the wall in discharges with NBI heating parallel to and in the direction of the plasma current (co-injection) and can be seen with a non-zero rotation frequency only in shots with anti-parallel NBI (counter-injection). Additional information is given by ECE data. The existence of low and high frequency MHD events suggests an interpretation in the framework of the peeling-ballooning model. The high frequency magnetic activity seems to be related strictly to the increase in (and eventual saturation of) edge electron temperature, while low frequency modes are-related directly to the ELM crash itself.
机译：在ASDEX升级中发现了与I型边缘局部模式（ELM）周期有关的高频相干磁涨落。典型频率在300-500 kHz范围内，在外侧中平面测得的极坐标模式数m估计为10-15。这些MHD模式存在于许多低密度（低碰撞性）放电中，而尚未在高密度放电中发现。对已知的低频I型ELM前体的新发现证实，在ASDEX升级版中，I型ELM模式前体通常在与NBI平行且沿等离子流方向（共注入）的NBI加热的放电中被锁相到壁上。仅在具有反平行NBI（反注射）的镜头中可以看到非零旋转频率。其他信息由ECE数据提供。低频和高频MHD事件的存在提示了在剥离-气球模型的框架中的解释。高频磁活动似乎严格与边缘电子温度的升高（以及最终饱和）相关，而低频模式与ELM碰撞本身直接相关。

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