Edge-localized-mode-induced transport of impurity density, energy, and momentum

M. R. Wade, K. H. Burrell, A. W. Leonard, T. H. Osborne, P. B. Snyder

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Abstract

High temporal and spatial resolution measurements of impurity dynamics associated with an edge-localized mode (ELM) indicate that the ELM perturbation consists of two distinct parts: a rapid (<300μs) expulsion of impurity density at the time of the instability followed by a slower time scale (<1ms) decrease in the ion temperature. While the density perturbation remains nearly constant over a wide range of plasma collisionality, the temperature perturbation decreases as the collisionality increases. Analysis of the radial electric field Er evolution indicates that the Er well normally present in H-mode plasmas is modified strongly by the ELM and that the size of the temperature perturbation is correlated with the associated change in the E×B shear.

Original languageEnglish
Article number225001
JournalPhysical Review Letters
Volume94
Issue number22
DOIs
StatePublished - Jun 10 2005

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