TRANSPORT MODELING OF CORE FUELING AND GLOBAL PARTICLE CONFINEMENT INELM-FREE H-MODE PLASMA IN DIII-D

Evaluations of core fueling rates and global particle confinement time s are presented for a single-null ELM-free H-mode discharge in the DII I-D tokamak. The edge plasma transport is modeled with the B2.5 code, and the neutral transport with both the DEGAS code and the internal ne utrals model in the B2.5 code. Radial transport coefficients and corre sponding plasma particle and heat fluxes into the scrape-off layer (SO L) are determined from power balance and by fitting the electron densi ty and temperature profiles measured by Thomson scattering and the ion temperature profiles from charge-exchange/recombination spectroscopy. Divertor plasma parameters are deduced by fitting infrared television camera (IRTV) data, divertor Langmuir probe measurements, and D-alpha data. Core fueling rates are calculated with DEGAS and compared to th ose required by particle balance, with the core efflux determined by B 2.5. Global particle confinement times, deduced at four time slices du ring the 1.8 s ELM-free period, are typically 3-4 times the correspond ing measured energy confinement times.