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Development of internal transport barrier scenarios at ITER-relevant high triangularity in JET
 
F.G. Rimini, M. Bécoulet, E. Giovannozzi, P.J. Lomas, O. Tudisco, B. Alper, F. Crisanti, M. de Baar, E. de La Luna, P. de Vries, A. Ekedahl1, N. Hawkes, G. Huysmans, X. Litaudon, V. Parail, G. Saibene, A.A. Tuccillo, K.D. Zastrow and EFDA-JET Workprogramme Contributorsa
 

2005

  DOI
 
Resumo
 
The development of scenarios characterized by H-mode confinement and internal transport barriers (ITBs) in high triangularity, discharges is of particular interest for ITER advanced tokamak operation. Previous JET experiments have shown that high triangularity favours H-modes which are ELM-free or develop type I edge localized mode (ELM) activity, which inhibits long lasting ITBs. The recent experiments reported here concentrate on integrated optimization of edge and core conditions. The stability of the edge pedestal was controlled using gas injection, deuterium or light impurities, and plasma current ramps. Both methods yield more ITB-friendly edge pedestal conditions, varying from small type I to type IIIELMsand, in extreme cases, resulting in L-mode....
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