1. NAME AND TITLE
TRAX: A Program For Optics of Curved Crystal Neutron Spectrometers.
Institute for Nuclear Power Reactors, Pitesti, Romania, through the NEA Data Bank, Gif-sur-Yvette Cedex, France.
3. CODING LANGUAGE AND COMPUTER
Fortran IV; CDC Cyber.
4. NATURE OF PROBLEM SOLVED
TRAX computes the resolution matrix and characteristic line widths and intensities for three-axis
slow-neutron spectrometers with flat or curved, mosaic or perfect crystals, with or without Soller
collimators or limiting diaphragms.
5. METHOD OF SOLUTION
The matrix computational technique is used. A library of data on crystal monochromators is built
into the program. The analytical optimization is computed through formulae valid for perfect curved
thin crystals. The numerical optimization is performed by searching iteratively for the minimum of
an optimization parameter with the aid of numerical subroutines.
6. RESTRICTIONS OR LIMITATIONS
7. TYPICAL RUNNING TIME
On the CDC Cyber 170, the CPU time is less than 1 second per case. For numerical optimization, the run time increases rapidly with the number of variables. For 3 variables, it is less than 1 minute; for 6 variables, it is less than 6 minutes.
The test case in the package has been run at NEA-DB on a CDC Cyber 830 in 1.4 seconds of CPU
8. COMPUTER HARDWARE REQUIREMENTS
The code runs on the CDC Cyber computers, model 170 and 830.
9. COMPUTER SOFTWARE REQUIREMENTS
The code was written in Fortran IV and runs on the Cyber computers under the NOS operating
system. The IMSL library of mathematical subroutines is required.
M. Popovici, A. D. Stoica, an I. Ionita, "Optics of Curved-Crystal Neutron Spectrometers,"
informal notes (1987).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette.
12. DATE OF ABSTRACT
KEYWORDS: NEUTRON; OPTIMIZATION