1. NAME AND TITLE

MUXS: Generator of Multigroup Cross Sections for Charged Particle Transport Problems.

AUXILIARY PROGRAM

ANISN-ORNL: Multigroup One-Dimensional Discrete Ordinates Transport Code System with Anisotropic Scattering.

2. CONTRIBUTOR

Computer Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

Fortran IV, Assembler Language; IBM 3033.

4. NATURE OF PROBLEM SOLVED

MUXS generates multigroup cross sections for charged particle transport problems. The cross sections generated by MUXS can be used in many multigroup transport codes, with minor modifications to these codes, to calculate sputtering yields, reflection coefficients, penetration distances, etc.

5. METHOD OF SOLUTION

Since treatment of the many small deflections of the ion using a Legendre expansion of the differential scattering cross section is simply not feasible, MUXS accounts for the energy lost by the ion when deflected through small angles with a continuous slowing down term. This approach ignores the directional change due to these interactions. All electronic interactions with the ion are included in this term. Interactions with the nuclei that result in a scattering angle that is less than a prescribed angle @Thetan are also treated as continuous interactions. Scatterings through angles larger than Thetan are termed "discrete interactions" and are included in the evaluation of the multigroup total and scattering cross sections.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

On an IBM 3033 computer operating under MVS, MUXS required 25 sec and 834 I/O and the ANISN-ORNL sputtering sample problem required 5 min. and 700 I/O.

8. COMPUTER HARDWARE REQUIREMENTS

MUXS is operable on the IBM 3033 computers and requires 540 K of memory. The ANISN-ORNL sputtering calculation requires 900 K.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCE

T. J. Hoffman, M. T. Robinson, and H. L. Dodds, Jr., "MUXS: A Code to Generate Multigroup Cross Sections for Sputtering Calculations," ORNL/CSD/TM-185 (October 1982).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

April 1984.