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Edge Localized Mode (ELM)

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Active Control of Magneto-hydrodynamic Instabilities in Hot Plasmas

Part of the book series: Springer Series on Atomic, Optical, and Plasma Physics ((SSAOPP,volume 83))

Abstract

The next generation of fusion machines like ITER and DEMO will need a reliable method for controlling the periodic transient expulsion of a considerable amount of energy onto the plasma-facing components caused by instabilities at the plasma edge. The good plasma confinement in these tokamak devices will result in a steepened pressure profile at the plasma edge. When the pressure gradient exceeds a critical value, so-called edge- localized modes (ELMs) are destabilized. These modes feature a periodic fast collapse of the edge pressure, a sudden loss of the confinement, and a subsequent release of heat and particles onto plasma-facing components. The associated transient heat loads might cause excess erosion and lead to a strong reduction of the plasma-facing component lifetime. In this chapter, an overview of recent development of several ELM control methods for next-generation tokamaks, e.g., ITER is given. Some key physics issues related to the mechanism of ELM control are discussed.

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  1. Forschungszentrum Jülich GmbH, Association EURATOM-FZ Jülich, Institut Für Energieforschung—Plasmaphysik, Trilateral Euregio Cluster, 52425, Jülich, Germany

    Yunfeng Liang

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  1. Max-Planck-Institut für Plasmaphysik, Garching, Germany

    Valentin Igochine

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Liang, Y. (2015). Edge Localized Mode (ELM). In: Igochine, V. (eds) Active Control of Magneto-hydrodynamic Instabilities in Hot Plasmas. Springer Series on Atomic, Optical, and Plasma Physics, vol 83. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-44222-7_5

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