Computer Programs

PSR-0196 FLYSPEC.

PSR-0196 FLYSPEC.

FLYSPEC, Neutron Spectra Unfolding from Ne213 and Stilbene Scintillation Detectors

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, 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 UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: FLYSPEC.

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2. COMPUTERS

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Program name	Package id	Status	Status date
FLYSPEC	PSR-0196/01	Tested	29-OCT-1984

Machines used:

Package ID	Orig. computer	Test computer
PSR-0196/01	CDC 7600	CDC CYBER 740

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3. DESCRIPTION OF PROGRAM OR FUNCTION

FLYSPEC unfolds proton recoil pulse-height spectra obtained with NE213 and stilbene neutron detectors. Parallel processing allows to reduce data from many spectrometers simultaneously. The program is therefore particularly adapted for plasma diagnostics applications.

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4. METHOD OF SOLUTION

A derivative unfolding method is used. A digital filter estimates the derivative of the pulse-height spectrum at selected recoil proton energies. It is derived from the least-square fit of a parabola to the region of data centered on the selected proton energy. Cubic B-spline functions have been introduced to represent the scintillation light output as a function of proton energy.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:

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6. TYPICAL RUNNING TIME

About 6 seconds are required on the LSI-11 microcomputer to obtain an output spectrum.

PSR-0196/01

NEA-DB executed the test case on CDC CYBER 170/740 in less than 1 second of CPU time.

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7. UNUSUAL FEATURES OF THE PROGRAM: Fast data reduction on small computers.

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8. RELATED AND AUXILIARY PROGRAMS:

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9. STATUS

Package ID	Status date	Status
PSR-0196/01	29-OCT-1984	Tested at NEADB

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10. REFERENCES:

PSR-0196/01, included references:

- D. Slaughter and R. Strout, II:
  FLYSPEC: A Simple Method  of Unfolding Neutron Energy Spectra
  Measured with Ne213 and Stilbene Spectrometers.
  Reprint of "Nuclear Instruments and Methods" 198 (1982) 349 - 355

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11. MACHINE REQUIREMENTS:

PSR-0196/01

32,400 octal words of main storage on CDC CYBER 170/740.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
PSR-0196/01	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
NOS 1.4 (CDC CYBER 170/740).

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

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15. NAME AND ESTABLISHMENT OF AUTHORS

     Dennis Slaughter
     Lawrence Livermore National Laboratory
     Livermore, CA 94550, U. S. A.

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16. MATERIAL AVAILABLE

PSR-0196/01

File name	File description	Records
PSR0196_01.003	FLYSPEC INFORMATION FILE	58
PSR0196_01.004	FLYSPEC EXECUTION INSTRUCTIONS	115
PSR0196_01.005	FLYSPEC SOURCE PROGRAM (FORTRAN)	434
PSR0196_01.006	FLYSPEC TERMINAL INPUT (TAPE5)	4
PSR0196_01.007	PULSE HEIGHT DATA (TAPE2)	34
PSR0196_01.008	FLYSPEC OUTPUT ON TERMINAL (TAPE6)	88
PSR0196_01.009	FLYSPEC RESULT OUTPUT (TAPE3)	79
PSR0196_01.010	SHORTSPEC EXECUTION INSTRUCTIONS	223
PSR0196_01.011	SHORTSPEC SOURCE PROGRAM (FORTRAN)	2060
PSR0196_01.012	SHORTSPEC TEST CASE INPUT DATA	34
PSR0196_01.013	SHORTSPEC TEST CASE PRINTED OUTPUT	244

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17. CATEGORIES

O. Experimental Data Processing

Keywords: neutron detectors, neutron spectra, scintillation detectors, spectra unfolding.