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The spatial structure of type-I ELMs at the mid-plane in ASDEX Upgrade and a comparison with data from MAST

机译:ASDEX升级中型I型ELM的空间结构以及与MAST数据的比较

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The radial extent and spatial structure of type-l edge localized modes (ELMs) in ASDEX Upgrade are investigated using data from a mid-plane manipulator equipped with Langmuir probes and a fast visible imaging camera and are compared to data from MAST. Plasmas with a range of toroidal magnetic fields have been studied. The radial extent of the ELM efflux is found to be largest at the smaller toroidal magnetic field. A study of a series of shots on ASDEX Upgrade with different plasma edge to wall separation suggests that the closeness of the wall does not have a stabilizing effect on the radial extent of the ELM. The data from the mid-plane manipulator and from visible imaging are consistent with non-linear ballooning mode theory, which predicts that the ELM has a filament like structure. On both devices these structures have a poloidal extent of 5-10 cm and a typical toroidal mode number of similar to 15 and are found to accelerate away from the plasma edge. The acceleration is similar to 3 times larger on MAST than on ASDEX Upgrade.
机译:使用装备有Langmuir探头和快速可见成像相机的中平面操纵器的数据,研究了ASDEX升级版中I型边缘定位模式(ELM)的径向范围和空间结构,并将其与MAST的数据进行了比较。已经研究了具有一系列环形磁场的等离子体。发现在较小的环形磁场下,ELM外排的径向范围最大。对ASDEX升级系列的一系列镜头的研究表明,等离子边缘与壁的分离程度不同,表明壁的紧密度对ELM的径向范围没有稳定作用。来自中平面操纵器和可见光成像的数据与非线性气球模式理论一致,该理论预测ELM具有细丝状结构。在这两种设备上,这些结构的倍数范围为5-10厘米,典型的环形模数接近15,并且发现其加速远离等离子体边缘。与ASDEX升级相比,MAST的加速度大约大3倍。

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