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.