Spatial Characterization Of A Divertor In The Presence Of An X-Point Marfe By Collisional-Radiative Modeling And Line Profile Calculations

High-resolution C IV n = 6-7 (lambda = 722.6 nm) line spectra measured in the divertor of JT-60U in presence of an X-point MARFE are analyzed using line profiles accounting for Stark and Doppler broadenings but excluding Zeeman effect which was suppressed experimentally. Spectra are fitted assuming either a single or two plasma layers depending on the crossed part of the MARFE. The ion temperature is taken equal to that of the electrons, the latter being deduced from C IV line intensity ratios. A density of 10(20) m (3) has been determined after fitting peripheral spectra with respect to the MARFE. For spectra related to central parts of the MARFE, two homogeneous plasma layers were assumed: a low-density layer (N-e((l)) = 10(20) m(-3)) and a high-density one with T-e((h)) = 1 - 3 eV. For few values of T-e((h)), a fitting procedure was used in which T-e((l)) (low-density layer temperature) and N-e((h)) (high-density layer density) were searched for in the domains 1-25 eV and 10(20)-10(21) m (3). (C) 2013 Elsevier B.V. All rights reserved.