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Manuscript Title: TRIP 1: a time-dependent recombination ionisation package.
Authors: J. Magill
Program title: TRIP 1
Catalogue identifier: ABUV_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 16(1978)129
Programming language: Fortran.
Computer: IBM 370/168.
Operating system: MVS, JES3.
Word size: 32
Keywords: Atomic process, Ionisation, Recombination, Time-dependent, Steady state, Plasma physics, Optically thin.
Classification: 19.1.

Subprograms used:
Cat Id Title Reference
ABUF_v1_0 OLYMPUS CPC 7(1974)245
ABUF_v2_0 OLYMPUS CPC 9(1975)51
ABUF_v3_0 OLYMPUS FOR CDC 6500 CPC 10(1975)167

Nature of problem:
TRIP 1 has been constructed to follow the time-depentent ionisation and recombination processes in a plasma of any density. The program can be used by itself or together with hydrodynamic codes in any dimension.

Solution method:
To estimate the degree of ionisation in the plasma, we solve for the mean and mean square ionisation levels <z> and <z**2>. In general these are functions of electron density, temperature and time. Subsidiary variables are the radiation rates, internal energy, etc.

In the present version of TRIP 1 we allow only for a single element plasma. The radiation transfer problem is avoided by assuming the plasma to be optically thin. Only the ground state population densities are considered and analytic expressions are used for the rate coefficients.

Running time:
On the IBM 360/145 at Karlsruhe 100 timesteps with no iterations per timestep take 0.25 s.