Circular limiter DD and DT H-modes have been obtained through transitions in supershot and high-poloidal-beta plasmas in TFTR. High tritium concentrations have been realized, with tritium fuelling mostly through the heating beams, varying from all to all beams. Density fluctuations were reduced by a factor of two across the plasma and and profiles have features consistent with simultaneous transport barriers in the plasma core and edge. values from TRANSP decrease by a factor of 2 to 5 in these regions at the transition and remain low until the onset of ELMs.
Physics of high performance JET plasmas in DT