Radial profiles of atomic deuterium measured in the boundary of TEXTOR 94 with laser-induced fluorescence

The density profiles of atomic deuterium have been recorded in the boundary plasma of TEXTOR 94 during Ohmic discharges for central, line-averaged electron densities between 1.5 X 10(19) and 3.5 X 10(19) m(-3). They have been measured in the outer equatorial plane, from the liner inwards to a few cm within the last closed flux surface, with laser-induced fluorescence at L alpha (121.5 nm). The drop in density around the separatrix indicates a shorter decay length than derived from H-alpha-measurements in front of a limiter. The corresponding spectral profiles show the substantial contribution of a very cold component around 0.5 eV and below.