NEUTRAL GAS-TRANSPORT MODELING WITH DEGAS-2

We are currently rewriting the neutral gas transport code, DEGAS [1,2], with a view to not only making it faster, but also easing the process of including new physics. The goal is to make adding new species and reactions relatively simple so that the code can be rapidly adapted to new divertor physics regimes. DEGAS 2 will also be optimized for coupling to fluid plasma codes, incorporating many of the techniques utilized in B2-EIRENE[3-5]. Finally, it is our intention that DEGAS 2, like DEGAS, be well-documented and easy to use. We will present model calculations including ionization and charge exchange which will illustrate the way reactions are included into DEGAS 2 and will demonstrate operation of the code.