EXPERIMENTAL-STUDY ON NEOCLASSICAL PROPERTIES OF THE IONS IN THE EDGEPLASMA OF THE TOKAMAK TEXTOR

The ions in the edge plasma in front of the limiter ALT II in Ohmic di scharges of TEXTOR are in the banana/plateau regime. The qualitative d ependencies of the ion speed parallel to the magnetic field are the sa me as those expected from neoclassical theory. Significance of charge exchange collisions for the loss of toroidal angular momentum is prese nted. With reasonable assumptions for the density of the deuterium ato ms also quantitative agreement between the experimental and theoretica l ion drift speeds can be achieved.