PSR-0075 AXMIX.

AXMIX, ANISN Cross-Sections Mixing, Transport Corrections, Data Library Management

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: AXMIX.

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2. COMPUTERS

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Program name	Package id	Status	Status date
AXMIX	PSR-0075/01	Tested	01-APR-1977

Machines used:

Package ID	Orig. computer	Test computer
PSR-0075/01	IBM 370 series	IBM 370 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

Mixing, changing table length, adjointing, making scattering order adjustments (PN delta function subtraction), and transport corrections of ANISN-type cross sections, and management of cross section data sets and libraries.

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4. METHOD OF SOLUTION

The number of energy groups which will fit into the core allocated is determined first. If all groups will fit, the solution is straightforward. If not, then the maximum number of groups which will fit is processed repeatedly using direct access I/O and storage disks.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Some flexibility in applying AXMIX is lost when cross sections to be processed contain upscatter. A special section on upscatter is therefore included in the report.

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6. TYPICAL RUNNING TIME

Problems of a practical nature require from 2 to 20 seconds of CPU time on the IBM 360/91 computer. Running time is inversely proportional to the number of groups of data which will fit into core memory. I/O time is 50 - 100 times CPU time.

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7. UNUSUAL FEATURES OF THE PROGRAM

Any number of data sets of all types (cards, nuclide libraries and group independent (GIP) libraries) may be referenced for input. GIP libraries may be referenced selectively by using the position number of the cross sections desired. In general, any or all forms of output (punched, tape, disk, printed) may be obtained at the same time by independent selection of cross sections for each form. In addition, output nuclide cross sections may be added to or merged with an existing nuclide library.

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8. RELATED AND AUXILIARY PROGRAMS

AMP (activity manipulation program) may be used in conjunction with AXMIX to handle group responses and conversion factors within the cross section tables and to perform some limited manipulation of cross sections by table position. Results of these codes are satisfactory for use by ANISN, DOT, MORSE and other codes of this family.
other codes of this family.

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9. STATUS

Package ID	Status date	Status
PSR-0075/01	01-APR-1977	Tested at NEADB

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10. REFERENCES

PSR-0075/01, included references:

- G.C. Haynes:
  The AXMIX Program for Cross Section Mixing and Library
  Arrangements
  (December 1974).
- W.W. Engle, Jr.:
  AMP (Activity Manipulation Program)
  (June 1975).
- W.A. Rhoades:
  The GIP Program for Preparation of Group-Organized Cross Section
  Libraries
  Informal Notes (November 1975).

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11. MACHINE REQUIREMENTS

In addition to the standard I/O equipment, the computer facility must have enough core memory to run all groups of a problem at once. See also item 13 below.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
PSR-0075/01	FORTRAN+ASSEMBLER

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED

If
core memory is insufficient (see itme 11 above), direct access I/O routines of the FBSAM type developed by W.A. Rhoades et al. at ORNL must be available.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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15. NAME AND ESTABLISHMENT OF AUTHORS

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, USA

Developed by:   Oak Ridge National Laboratory
                Oak Ridge, Tennessee, USA

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16. MATERIAL AVAILABLE

PSR-0075/01

File name	File description	Records
PSR0075_01.001	INFORMATION	11
PSR0075_01.002	ANISN LIBRARY DATA - BCD	1025
PSR0075_01.003	ANISN SOURCE PROGRAM - MIXED CODE	140
PSR0075_01.004	ANISN DD CARDS	6
PSR0075_01.005	ANISN INPUT DATA	1
PSR0075_01.006	ANISN OUTPUT	16
PSR0075_01.007	AXMIX ROUTINE 'LOC' - ASSEMBLER	7
PSR0075_01.008	AXMIX ROUTINE 'IDATEF' - ASSEMBLER	16
PSR0075_01.009	AXMIX ROUTINE 'BSAM' - ASSEMBLER	298
PSR0075_01.010	AXMIX SOURCE PROGRAM - FORTRAN IV MIXED	2564
PSR0075_01.011	DUMMY ROUTINES 'IDAY','ERROR' - F4 EBCDIC	10
PSR0075_01.012	AXMIX DD CARDS	9
PSR0075_01.013	AXMIX INPUT DATA	26
PSR0075_01.014	AXMIX OUTPUT	525
PSR0075_01.015	AMP SOURCE PROGRAM - F4 EBCDIC	1812
PSR0075_01.016	AMP INPUT DATA	31
PSR0075_01.017	AMP OUTPUT	322
PSR0075_01.018	GIP SOURCE PROGRAM - F4 EBCDIC	1633
PSR0075_01.019	GIP ROUTINES CRIT,ALOCAT ETC. - ASSEMBLER	208
PSR0075_01.020	GIP ROUTINES CRIT,ALOCAT ETC - F4 EBCDIC	45
PSR0075_01.021	GIP DUMMY ROUTINES (INTBCD,JOBNUM) ECBDIC	5
PSR0075_01.022	GIP DD CARDS	11
PSR0075_01.023	GIP INPUT DATA	225
PSR0075_01.024	GIP OUTPUT	612

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17. CATEGORIES

M. Data Management

Keywords: cross sections, data processing, transport theory.