Abstract
Experiments on Alcator C-Mod have demonstrated edge plasma conditions with optically thick hydrogenic Lyman lines [1, 2]. In these high opacity plasma regions, the total neutral particle density and excited-state populations depend on the radiation field. Current edge plasma-neutral fluid codes ignore this dependence in their atomic physics models. For instance, collisional-radiative models are commonly used to define effective ionization, recombination and energy loss rates exclusively as functions of the local electron density and electron temperature [3]. To include radiation effects in plasma-neutral codes, we are working towards two goals: (1) extending the local atomic physics model to account for a spatially varying radiation field; and (2) driving the extended model with results from a non-local thermodynamic equilibrium atomic kinetics and radiation transfer code.
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