| Integration of creation and transport of methane and its fragments has been carried out in the Monte Carlo simulation code DIVIMP. Hydrocarbon release and breakdown have been shown experimentally to occur in significant quantities in tokamak plasma utilizing carbon for first wall and/or divertor components. Understanding these processes via simulation of the full system allowing interpretation of related experimental results is key for use of carbon on next-step devices including ITER. Therefore, a fully modular set of Fortran 90 routines has been added to DIVIMP modeling release (chemical sputtering), neutral and ion transport, breakdown, first-wall and target impact, and possible re-emission for hydrocarbons up to CH4 with the ability to expand to higher hydrocarbons (CxHy, x ≥ 2). Reasoning for the structure of the code, its implementation as DIVIMP-HC, use of, and results from the code as applied to DIII-D will be presented and discussed. |
