1. NAME AND TITLE

PLASMX: A Multigroup Ionization and Charge Exchange Cross-Section Code System for Neutral Hydrogen Transport in Plasmas.

2. CONTRIBUTOR

Los Alamos National Laboratory, Los Alamos, New Mexico.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; CDC-6600/7600.

4. NATURE OF PROBLEM SOLVED

PLASMX provides multigroup cross sections for neutral hydrogen atom transport calculations in Tokamak-type CTR plasmas. These cross sections are written to tape in a format specifically tailored to the LANL neutron transport codes, but they can be written in any specified format.

5. METHOD OF SOLUTION

PLASMX generates multigroup cross sections on one of the output files in a standard DTF-IV format suitable for one- and two-dimensional cylindrical discrete-ordinates transport codes such as CCC-266/ONETRAN or CCC-195/TWOTRAN.

6. RESTRICTIONS OR LIMITATIONS

Variable dimensioning presently restricts the number of energy groups to 22, the number of spatial regions to 10, and the number of Legendre polynomial moments to 7 (P₆). Changes for user applications are easily effected.

7. TYPICAL RUNNING TIME

A two-group, two-region, P₃ calculation requires approximately 30 s on a CDC-7600 computer. An 11-group, 10-region, P₃ calculation requires approximately 30 min.

8. COMPUTER HARDWARE REQUIREMENTS

PLASMX is operable on the CDC 6600/7600 computers. It requires two system input/output units and two output disks or tapes.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCE

J. E. Morel and B. R. Wienke, "PLASMX: Multigroup Ionization and Charge Exchange Cross-Section Code for Neutral Hydrogen Transport in Plasmas," LA-6661-MS (January 1977).

B. R. Wienke, "Mean, Mean - Square and Most - Probable Momentum for a Relative Maxwellian Ensemble," American Journal of Physics Vol. 43, No. 4, April 1975.

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

March 1984, updated December 1991.