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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 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. 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. The physical explanation of the Type I ELMs suppression on DIII-D still remains an open question. Presently the most developed interpretation of these experiments is the increased edge transport mechanism 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 (~0.1m2/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: 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);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)
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
Record Number: 200518287 / Last updated on: 2005-07-26
Category: PUBLICATION
Original language: en
Available languages: en