2D model calculations of carbon density and radiation profiles within the minor cross section of TEXTOR

In recent years a number of experimental investigations have been performed concerning the space distribution of carbon ions in the TEXTOR plasma. These measurements were either local (radial distribution of C$^{z+}$-ions at he outboard midplane as measured by Li$^{0}$-beam activated cx-spectroscopy [1]) or integral (spectral measurements of C$^{z+}$-line emission integrated along off-centered lines within an angular range as seen from a spectrometer at an upper position of the TEXTOR-vessel [2]). In discharges with carbon as the main impurity species also bolometric measurements [3] give some indications of the space distribution of carbon within the minor plasma cross-section. The comparison of the corresponding experimental observations with theory requires 2D-model calculations including the Shafranov-shifted magnetic field configuration and the poloidal ALT-II limiter position of TEXTOR (as schematically depicted in fig. 1). Results of such calculations are discussed in the present paper