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Abstract

Edge localized mode (ELM) control has been investigated on MAST with a set of in-vessel coils producing n = 3 perturbations. In spite of a broad enough region where the Chirikov parameter is above 1, according to the criterion employed for the design of the ITER ELM control coils, no effect was seen on type I ELMs. The behaviour on MAST is different from that in DIII-D in this respect. The coils do have an effect, however, on Ohmic L-mode plasmas and plasmas just above the L-H transition. In the former, they induce a density pump-out, modify the turbulence characteristics and edge radial electric field and produce a strike point splitting, while in the latter they can trigger ELMs in ELM-free plasmas.

Additional information

Authors: NARDON E, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);KIRK A, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);AKERS R, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);BÉCOULET M, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);CAHYNA P, Institute of Plasma Physics AS CR v.v.i., Association EURATOM/IPP.CR, Prague (CZ);DE TEMMERMAN G, University of York,, York (UK);DUDSON B, University of York,, York (UK);HNAT B, Centre for Fusion, Space and Astrophysics, Warwick University, Coventry (UK);LIU Y Q, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon (UK);MARTIN R, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon (UK);MEYER H, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon (UK);TAMAIN P, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon (UK);TAYLOR D, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon (UK);TEMPLE D, EURATOM/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon (UK)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion, Issue 51, December 2009
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1088/0741-3335/51/12/124010
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