1. NAME AND TITLE

ACAT: Monte Carlo Simulation of Atomic Collisions in Amorphous Targets in the Binary Collision Approximation.

2. CONTRIBUTOR

Okayama University of Science, Okayama, Japan.

3. CODING LANGUAGE AND COMPUTER

Fortran 77; Facom 380S and IBM 3033.

4. NATURE OF PROBLEM SOLVED

ACAT calculates various phenomena such as sputtering, reflection, range distribution and damage distribution associated with atomic collisions in amorphous targets.

5. METHOD OF SOLUTION

ACAT is based on the binary collision approximation in the Monte Carlo simulation of atomic collisions in solids. An amorphous target is simulated employing the cell model in which a target atom is randomly distributed in each unit cubic cell of which the lattice constant is the inverse cube root of the atomic density.

6. RESTRICTIONS OR LIMITATIONS

In the ACAT program one can treat a three layer medium composed of five elements.

7. TYPICAL RUNNING TIME

On the IBM 3033 sample problem 1 ran in less than 16 minutes, sample problem 2 ran in less than 5 minutes, and sample problem 3 ran in less than 25 minutes.

8. COMPUTER HARDWARE REQUIREMENTS

ACAT was developed on the Facom 380S and also runs on the IBM 3033. ACAT is transportable and can be run on most computers with at least 2200 K of memory.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran 77 compiler is required. The code was run at RSIC on the IBM 3033 under the MVS operating system using the VS compiler.

10. REFERENCE

Y. Yamamura, "ACAT: Computer Simulation of Atomic Collisions in Amorphous Target," Okayama University of Science, Okayama, Japan.

11. CONTENTS OF CODE PACKAGE

Included is the referenced document and one (1.2MB) DOS diskette which contains the source code, sample JCL, input and output.

12. DATE OF ABSTRACT

March 1988.