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Manuscript Title: A fast algorithm for investigations on the three-dimensional Ising model. See erratum Comp. Phys. Commun. 55(1989)251.
Authors: M. Creutz, P. Mitra, K.J.M. Moriarty
Program title: ISING
Catalogue identifier: ACCP_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 33(1984)361
Programming language: Fortran, Compass.
Computer: CDC CYBER 170-730.
Operating system: CDC NOS 2.1.
RAM: 25K words
Word size: 60
Keywords: Statistical physics, Thermodynamics, Ising model, Phase transitions, Critical exponents, Correlation functions, Magnetization, Microcanonical methods.
Classification: 23.

Nature of problem:
We wish to study the critical temperature and critical exponents of the three-dimensional Ising model.

Solution method:
A microcanonical method with demons is used for the simulation of the three-dimensional Ising model. The updating procedure is essentially deterministic and uses only integer arithmetic. Correlations can be measured.

The only restriction on the use of the program is the time needed to acquire reasonable statistics.

Running time:
The execution time increases with the number of spin updates required. The program will carry out 860,000 spin updates per second on the CDC CYBER 170-730 or 24,000,000 spin updates per second, including measuring the demon energy and lattice magnetization, on the CDC 7600. The test run output with a reduced lattice size took 4.8 secs on the CDC CYBER 170-730.