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One key scientific program conducted at several major tokamak experiments is dedicated to further consolidation of the ITER reference scenario, the type-I ELMy H-mode. A main goal is to establish an operational scenario combining both high confinement and acceptable ELM imposed power loads on the divertor plates. ELM pace making enhancing the ELM frequency fELM beyond the intrinsic value f0 and hence accordingly ameliorating ELMs is one option being considered for this task. Techniques currently under investigation aim to manipulate the ELM frequency by altering the pressure gradient and/or current profile in the steep gradient zone of the transport barrier at the plasma edge. Strong local perturbations are expected to trigger ELMs almost instantly on a sub-ms time scale. A gradual change of the ELM behaviour should take place in cases of control tools altering profiles over the entire toroidal circumference. Different techniques are under investigation currently at ASDEX Upgrade, recent results will be reported here.

Additional information

Authors: LANG P T et al, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Teilinstitut Greifswald, Greifswald (DE)
Bibliographic Reference: An oral paper given at: 31st EPS Conference on Controlled Fusion and Plasma Physics Organised by: CCLRC Rutherford Appleton Laboratory (GB) Held at: Imperial College London (GB)
Availability: Available from Association EURATOM-CEA, Département de Recherches sur la Fusion Contrôlée, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail:
Record Number: 200517970 / Last updated on: 2005-03-08
Original language: en
Available languages: en
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