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Joint European Torus discharges which demonstrate the critical role the safety factor profile, q, can play in the formation of internal transport barriers (ITB) are examined. In these discharges, the target parameters, including the E×B flows, were kept virtually the same, except for the q profile. In a discharge with a non-monotonic q, an ITB was triggered whereas a discharge with monotone q made no such transition. Thus, there is strong evidence that the q profile was the critical factor for the triggering of an ITB. Possible interpretations of this finding are discussed.

Additional information

Authors: ERIKSSON L-G ET AL, Association Euratom-CEA pour la fusion, CEA Cadarache, St.-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Physical Review Letters, Vol 88, No 14, pp.145001/1-4 (2002)
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