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 language | English |
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Article number | 225001 |
Journal | Physical Review Letters |
Volume | 94 |
Issue number | 22 |
DOIs | |
State | Published - Jun 10 2005 |