"Effect of Resonant Magnetic Perturbations on Particle transport"
F.L. Waelbroeck
Institute for Fusion Studies, University of Texas at Austin
Edge-localized modes (ELM) threaten to subject the ITER divertor to unacceptable heat loads. Resonant magnetic perturbations (RMP) have been shown to suppress ELMs in some machines. The cause of the suppression is believed to be a particle pump-out caused by the overlap of magnetic islands. Our calculations, however, show that magnetic islands are suppressed except at the surface where the electron poloidal rotation reverses. At the other resonant surfaces, the combination of convective transport and of the JxB force gives rise to a radial particle flux that provides enhanced particle transport even for suppressed islands.
Vorticity near the k||=0 resonance for (a) a screened RMP, (b) an RMP near the onset of a locked mode, and (c) an RMP in the band of frequency where it excites propagating drift waves.
Host: Michael Mauel
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