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Abstract

The recent successful experiments on Type I ELM control in DIII-D using a stochastic boundary created by external I-coils [1-2] represents a great interest for the next-step tokamak ITER. The island chains on the edge rational surfaces can be created with the application of a small radial magnetic field perturbation generated by external coils [3-4]. When the islands overlap an ergodised edge layer is created and the heat and particle transport can be effectively increased by the magnetic field line diffusion [3-4]. The physical explanation of the Type I ELMs suppression on DIII-D still remains an open question [1-2]. Presently the most developed interpretation of these experiments is the increased edge transport mechanism [5] leading to a marginal decrease of the pedestal pressure gradient below the critical value for ELMs. Since the transport in the External Transport Barrier is small (~0.1m{2}/s) even a small increase of the edge transport due to the external radial magnetic perturbation can be rather effective. The Type I ELM suppression can be done at high confinement controlling the value of the edge magnetic field perturbation.

Additional information

Authors: BECOULET M, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);NARDON E, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);THOMAS P R, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);HUYSMANS G, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);DUBOIS F, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);ARTAUD J F, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);IMBEAUX F, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);LIPA M, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);GHENDRIH P, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);GROSMAN A, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);MOYER R A, University of California, San Diego, La Jolla (US);EVANS T E, General Atomics, San Diego (US);SCHAFFER M, General Atomics, San Diego (US);CHUYANOV V, ITER JWS Garching Co-center, Garching (DE);FEDERICI G, ITER JWS Garching Co-center, Garching (DE)
Bibliographic Reference: An oral paper given at: 32nd EPS Conference on Controlled Fusion and Plasma Physics Organised by: Asociación EURATOM-CIEMAT para Fusión Held at: Congress Palace of Tarragona, Tarragona (ES)
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, FranceL%Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: dirdrfc@drfc.cad.cea.fr
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