OEDGE Code Interpretation of Carbon Co-deposition Experiments in DIII-D L- and H-Mode Plasmas

A carbon-13 tracer experiment in DIII-D involved injection of C$_{13}$-methane into ITER-like partially detached ELMy H-mode plasmas, as a follow-up to an earlier L-mode experiment. Experimental details are given by McLean et al, this meeting. For the L-mode experiments, the OEDGE interpretive code is able to successfully replicate the C$_{13}$-deposition pattern, edge spectroscopic emissions and the increment to the C-ion density in the main plasma. A fast ($M\sim 0.5$) edge flow toward the inner divertor and no erosion of the C$_{13}$-deposits was assumed in L-mode. OEDGE will be applied to the data set for the H-mode experiments; ELMs and $\sim$10X greater input power make redistribution of the C$_{13}$-deposits by plasma erosion more likely. OEDGE modeling will address the time-varying plasma conditions and carbon re-erosion.