Modeling is necessary to understand the data gathered from
and 
spectroscopic
diagnostics on a tokamak. The
emission and transport of this radiation in Alcator C-Mod is
calculated using the DEGAS 2
Monte Carlo neutral transport code
. The
plasma background needed by DEGAS 2
is obtained from a transport analysis code which takes
as input measured plasma
profiles. A simple model of the reflection of radiation on the walls of
the device is included. By comparing the predicted spatial profiles of the
emission spectra with those of the diagnostics, it is possible to infer
information about the ion and neutral flows and temperatures.