Pedestal fueling simulations with a coupled kinetic plasma-kinetic neutral transport code

The simplified neutral transport routine in the guiding center ion-electron-neutral neoclassical PIC code XGC0 has been replaced by one that calls the Monte Carlo neutral transport code DEGAS2. This provides a more realistic treatment of neutral atoms in the tokamak edge plasma and allows detailed atomic physics and plasma-material interaction processes to be incorporated into the simulations. The spatial profile of the neutral particle source used in DEGAS2 is determined from the fluxes of XGC0 ions to the material surfaces, and DEGAS2 is run in a time dependent manner synchronized with XGC0. The kinetic plasma-kinetic neutral transport capability is demonstrated with example pedestal fueling simulations.