  To characterize the conditions required to reach advanced divertor regimes, a
one-dimensional computational model has been developed based on a coordinate
transformation to incorporate two-dimensional effects. This model includes
transport of ions, two species each of atoms and molecules, momentum, and ion
and electron energy both within and across the flux surfaces. Impurity
radiation is calculated using a coronal equilibrium model which includes the
effects of charge-exchange recombination. Numerical results indicate that
impurity radiation acts to facilitate plasma detachment and enhances the power
lost from the divertor channel in escaping neutral atoms by cooling the
electrons and suppressing ionization. As divertor particle densities increase,
cold and thermal molecules become increasingly important in cooling the plasma,
with molecular densities dominating electron and atomic densities under some
conditions.
