ENHANCED ROTATION VELOCITIES AND ELECTRIC-FIELDS, SUB-NEOCLASSICAL ENERGY-TRANSPORT AND DENSITY PINCH FROM REVISITED NEOCLASSICAL THEORY

We show that the large negative radial electric fields which are measu red in front of the separatrix in H-mode discharges are easily explain able on the basis of the rigorous 'revisited' neoclassical theory. inc luding finite Larmor radii and inertia effects that was published earl ier (Rogister A 1994 Phys. Plasmas 1 619); the same theory naturally l eads to sub-neoclassical energy transport and novel particle pinch ter ms. The calculation has so far been developed only in the high collisi onality regime: step sizes comparable to gradient-scale sizes are ther efore not required to explain observed properties! Based on the analys is, we conclude that the radial electric field profile develops a well in front of the separatrix when the plasma is unable to sustain ambip olar Bows otherwise.