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Manuscript Title: McTrap, a program for the computation of radiation trapping in 3- level atoms including bleaching effects.
Authors: A.F. Molisch, B.P. Oehry, W. Schupita, G. Magerl
Program title: McTrap
Catalogue identifier: ADCC_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 93(1996)127
Programming language: Pascal.
Computer: VAX 4000 Alpha.
Operating system: VMS (OpenVMS), UNIX (OSF/1), MS-DOS 6.0.
RAM: 500K words
Word size: 32
Keywords: Radiation Trapping, Radiative transfer, Monte Carlo simulations, Particle diffusion, Bleaching.
Classification: 21.2.

Nature of problem:
Computation of the bleaching of ground state atoms in 3-level atoms in a two-dimensional cylindrical cell, with inclusion of particle diffusion, and of nonlinear trapping in such a geometry. The program can be easily specialized to treat the simpler, more usual radiation trapping problems.

Solution method:
Monte Carlo treatment of trapping and analytical solution of the diffusion equation for the particle diffusion.

Restrictions:
Restrictions of the achievable accuracy by memory and run-time limitations.

Unusual features:
None (An external random number generator might be convient.)

Running time:
Strongly dependent on the required accuracy; will be between 100 and 10000 CPU seconds in most practical cases.