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 proces s of including new physics. The goal is to make adding new species and reactions relatively simple so that the code can be rapidly adapted t o new divertor physics regimes. DEGAS 2 will also be optimized for cou pling to fluid plasma codes, incorporating many of the techniques util ized in B2-EIRENE[3-5]. Finally, it is our intention that DEGAS 2, lik e DEGAS, be well-documented and easy to use. We will present model cal culations including ionization and charge exchange which will illustra te the way reactions are included into DEGAS 2 and will demonstrate op eration of the code.