The FRANTIC model performs a very fast 1d neutral gas transport calculation for tokamak core plasmas, taking into account charge exchange and impact ionization atomic reactions in a simplified nested cylindrical flux surface geometry. This model is a generalization of the original code by Steve Tamor,
S. Tamor, J. Comput. Phys. 40 (1981) 104.
with extensions to permit multiple ion and neutral species including
Helium as well as Hydrogen isotopes. The calculation takes as input
a neutral source, which can be an "edge" influx neutrals representing
recycling or gas flow, or, a "volume source" due to recombination and/or
the charge exchange halo around injected neutral beams. The main
calculation is called once for each neutral source. All sources
are assumed to be distributed evenly around the circularly shaped flux
surfaces. The model also accepts as input data profiles of the rates
of depletion of neutrals by collisions with fast ion species-- a dominant
process in low density intensely heated tokamak experiments with
signifant fast ion density fractions. FRANTIC then calculates
neutral density and "temperature" and toroidal velocity profiles for
each of the neutral species associated with the given neutral source.
Particle, momentum and energy sources/sinks are calculated, as well
as complete particle, momentum and energy balance information for
each neutral specie. Atomic physics data comes from the PREACT module,
which includes ADAS and is an available component of the NTCC library.