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Abstract

Large 70Hz Type-I edge localized modes (ELMs) are converted into small 130Hz oscillations using edge resonant magnetic perturbations (RMPs) from a coil with currents less or as much as 0.4% I(p) in double null DIII-D plasmas. When the RMP is properly phased with respect to the background field errors, all but a few isolated ELM-like events are suppressed. The impulsive pedestal energy loss Delta E(ELM)/Delta t{1/2} to the scrape-of layer is reduced a factor of less or as much as 20 relative to the Type-I ELMs and the core confinement is unaffected by the perturbation field. Significant changes in the properties of the ELMs are also observed when edge RMPs are applied to lower single null plasmas but the nature of these changes are much more complex. Both lower single null and double null plasmas are being studied to determine how ELM control techniques based on the application of edge RMPs can be expected to scale to future devices such as ITER.

Additional information

Authors: EVANS T E, General Atomics, San Diego (US);OSBORNE T H, General Atomics, San Diego (US);GROEBNER R J, General Atomics, San Diego (US);JACKSON G L, General Atomics, San Diego (US);LA HAYE R J, General Atomics, San Diego (US);SCHAFFER M J, General Atomics, San Diego (US);MOYER R A, University of California at San Diego, La Jolla(US);BOEDO J A, University of California at San Diego, La Jolla(US);WATKINS J G, Sandia National Laboratories, Albuquerque(US);FENSTERMACHER M E, Lawrence Livermore National Laboratory, Livermore (US);GROTH M, Lawrence Livermore National Laboratory, Livermore (US);LASNIER C J, Lawrence Livermore National Laboratory, Livermore (US);HARRIS J, Australian National University, Canberra (AU);WANG G, University of California, Los Angeles (US);ZENG L, University of California, Los Angeles (US);THOMAS P R, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);FINKEN K H, Institut für Plasmaphysik, Forschungszentrum Jülich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Jülich (DE)
Bibliographic Reference: An article published in: Journal of Nuclear Materials 337-339 (2005) 691-696
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://probe.usp.br/cgi-bin/sciserv.pl?collection=journals&journal=00223115
Record Number: 200518092 / Last updated on: 2005-04-19
Category: PUBLICATION
Original language: en
Available languages: en