High Temperature Pedestals in JET and Confined Current Filaments

High temperature pedestals can be obtained in JET, transiently, by reducing recycling and operating at initially low density in the hot ion H-mode regime. The L-H transition occurs at low density, and after the transition the pedestal density, rotation and temperatures rise up until the occurrence of the first natural ELM. Recent examples at JET reach Te,ped = 2.8keV before the 1st ELM. Often the obstacle to reaching higher pedestal temperatures is MHD. Here we report on MHD observations in hot ion H-modes in high triangularity plasmas with 2.5MA, 2.7T and 15MW of Neutral Beam Injection heating.
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EFDC090633 1.07 Mb