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Progress in the peeling-ballooning model of edge localized modes: Numerical studies of nonlinear dynamics

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JournalPhysics of Plasmas
DatePublished - May 2005
Issue number5
Number of pages7
Pages (from-to)-
Original languageEnglish


Nonlinear three-dimensional electromagnetic simulations are employed to study the dynamics of edge localized modes (ELMs) driven by intermediate wavelength peeling-ballooning modes. It is found that the early behavior of the modes is similar to expectations from linear, ideal peeling-ballooning mode theory, with the modes growing linearly at a fraction of the Alfven frequency. In the nonlinear phase, the modes grow explosively, forming a number of extended filaments which propagate rapidly from the outer closed flux region into the open flux region toward the outboard wall. Similarities to nonlinear ballooning theory as well as additional complexities are observed. Comparison to observations reveals a number of similarities. Implications of the simulations and proposals for the dynamics of the full ELM crash are discussed. (c) 2005 American Institute of Physics.

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