Recent measurements of the neutral densities both inside and outside the separatrix near the X-point of the DIII-D tokamak, in both L- and H-mode plasmas, are analysed with the two-dimensional transmission/escape probability neutral transport code GTNEUT and with the two-dimensional Monte Carlo code DEGAS. The predictions of the two codes are in good agreement with each other and agree with the experiment to within the experimental error bars in most cases.
Impact of ionization peak location on measured opaqueness in DIII-D H-mode plasmas