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Discharges in the JET tokamak where the safety factor profile is identified as the critical factor for triggering
L-G Eriksson1, C Fourment, V Fuchs
1Association EURATOM-CEA sur la Fusion Contrôlée, CEA Cadarache, F-13108 St. Paul lez Durance, France.
Abstract:
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 x B flows, were kept virtually the same, except for the q profile. In a discharge with a nonmonotonic 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.
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