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Experimental observations in the boundary layer of TEXTOR with the toroidal belt limiter ALT-II at -45 show marked poloidal asymmetries of the plasma profiles. This paper aims to develop a physical picture to explain two major discrepancies with experimental evidence in ohmically heated discharges: (i) radial density profiles at the top (90 ) position are increased relative to those at the outboard midplane; (ii) radial profiles of the poloidal velocity at 0 exhibit a shear layer with flow reversal near the separatrix and high velocities in the electron diamagnetic direction just inside the separatrix, associated with large inward directed electric fields.

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Authors: GERHAUSER H, Forschungszentrum Jülich GmbH (KFA) (DE);CLAAßEN H A, Forschungszentrum Jülich GmbH (KFA) (DE);CLAA?EN H A, Forschungszentrum Julich GmbH (KFA) (DE)
Bibliographic Reference: Article: Proceedings of the 20th European Conference on Controlled Fusion and Plasma Physics, Vol. II (1993) pp. 835-838
Record Number: 199311153 / Last updated on: 1994-11-29
Original language: en
Available languages: en