Quantitative comparisons between experimentally measured 2D carbon radiation and Monte Carlo impurity (MCI) code simulations

Experimentally measured carbon line emissions and total radiated power dist ributions from the DIII-D divertor and scrape-off layer (SOL) are compared to those calculated with the Monte Carlo impurity (MCI) model. A UEDGE [T.D . Rognlien et al., J. Nucl. Mater. 196-198 (1992) 347] background plasma is used in MCI with the Roth and Garcia-Rosales (RG-R) chemical sputtering mo del [J. Roth, C. Garcia-Rosales, Nucl. Fusion 36 (1992) 196] and/or one of six physical sputtering models. While results from these simulations do not reproduce all of the features seen in the experimentally measured radiatio n patterns, the total radiated power calculated in MCI is in relatively goo d agreement with that measured by the DIII-D bolometric system when the Smi th78 [D.L. Smith, J. Nucl. Mater. 75 (1978) 20] physical sputtering model i s coupled to RG-R chemical sputtering in an unaltered UEDGE plasma. Alterna tively, MCI simulations done with UEDGE background ion temperatures along t he divertor target plates adjusted to better match those measured in the ex periment resulted in three physical sputtering models which when coupled to the RG-R model gave a total radiated power that was within 10% of measured value. (C) 1999 Elsevier Science B.V. All rights reserved.