Radial and spectral profiles of atomic deuterium in front of a limiter in TEXTOR 94:: Results of laser-induced fluorescence at Lyman-α

Density profiles of atomic deuterium have been recorded in the plasma edge of TEXTOR 94, in front of a limiter, during ohmic discharges for central, line-averaged densities between 1.0 x 10(19) and 3.0 x 10(19) m(-3). The corresponding spectral profiles could be measured simultaneously for each radial position. They show, like previous measurements in the vicinity of the wail, the predominance of very slow atoms, below 1 eV (within the covered range of 0-10 eV kinetic energy in the radial direction). The profiles give indications about the presumed molecular origin of these slow atoms. (C) 1999 Elsevier Science B.V. All rights reserved.