Particle accumulation at the edge observed in ne and Te profiles of H-mode JFT-2M plasma

The H-mode transition is accompanied by the development of an electron temperature pedestal of about 0.3 keV and a dramatic steepening of the density gradient inside the separatrix. A change of density profile from peaked to flat is obtained for both H- mode and ohmically heated plasmas, after an internal disruption. Hollow ne profiels are found in low Bt discharges (low q). These phenomena indicate a reduction of the electron energy transport at the edge of the plateau region.