NEA-1126 COLLI-PTB.

COLLI-PTB, Neutron Fluence Spectra for 3-D Collimator System by Monte-Carlo

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: COLLI-PTB.

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2. COMPUTERS

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Program name	Package id	Status	Status date
COLLI-PTB	NEA-1126/01	Tested	13-JUN-1995

Machines used:

Package ID	Orig. computer	Test computer
NEA-1126/01	TELEF. TR440	DEC VAX 6000

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3. DESCRIPTION OF PROGRAM OR FUNCTION

For optimizing collimator systems (shieldings) for fast neutrons with energies between 10 KeV and 20 MeV. Only elastic and inelastic neutron scattering processes are involved. Isotropic angular distribution for inelastic scattering in the center of mass system is assumed.

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4. METHOD OF SOLUTION

The Monte Carlo method with importance sampling technique, splitting and Russian Roulette is used. The neutron attenuation and scattering kinematics is taken into account.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Energy range from 10 KeV to 20 MeV. For the output spectra any bin width is possible. The output spectra are confined to 40 equidistant channels.

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6. TYPICAL RUNNING TIME

The running time depends essentially on the complexity of geometry. As a rough orientation a running time of about 1 hour per 10000 starting source neutrons is needed on a TR440 computer. For modern computers this time is much lower.

NEA-1126/01

NEA-DB ran the test case included in this package on a VAX 6000 using two different random generators. With the VAX system random generator, CPU time was 47min11sec; with the random generator from the SLATEC package, CPU time was 44min12sec.

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7. UNUSUAL FEATURES OF THE PROGRAM:

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8. RELATED AND AUXILIARY PROGRAMS

A random number generator must be provided. In the program the TR440 subroutine FAND1 creates the random numbers.

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9. STATUS

Package ID	Status date	Status
NEA-1126/01	13-JUN-1995	Tested at NEADB

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10. REFERENCES

- Everett, C.J., Cashwell, E.D.
  A Monte Carlo Sampler,
  USAEC Rep. LA-5061-MS, LAL 1972.
- Carter, L.L., Cashwell, E.D.
  Particle-Transport Simulation with the Monte Carlo Method,
  Los Alamos Scient. Lab., 1975.
- Leimdoerfer, M.
  On the Transformation of the Transport Equation for Solving Deep
  Penetration Problems by the Monte Carlo Method,
  Chalmers Tekniska Hoegskolas Handlingar Nr. 286, Scandinavian
  University Books, Goeteborg, Sweden (1964).

NEA-1126/01, included references:

- D. Schlegel-Bickmann:
  COLLI - A Monte Carlo Program for Calculating Neutron Spectral
  Fluences in the Energy Range 10 KeV to 20 MeV
  Description and Application.
  PTB-ND-26  (August 1985) (In German)
- D. Schlegel-Bickmann:
  COLLI - A Monte Carlo Program for Calculating Neutron Spectral
  Fluences in the Energy Range 10 KeV to 20 MeV
  Description and Application.
  PTB-ND-26  (August 1985) (In English)

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11. MACHINE REQUIREMENTS

172 K core storage, 380 K hard disc storage for data output and 70 K for program storage.

NEA-1126/01

NEA-DB tested the program on a DEC VAX 6000 computer.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-1126/01	FORTRAN-IV

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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
TR440 (Telefunken/Siemens, FRG).

NEA-1126/01

The test was performed by NEA-DB under VAX/VMS 5.5-2. The source program was compiled using the VAX Fortran-77 compiler.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

There
are some computer-specific commands (marked at the right edge of the program printout) in the program. They can be replaced by equivalent commands or taken out of the program without major problems.

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15. NAME AND ESTABLISHMENT OF AUTHORS

        Dietrich Schlegel-Bickmann
        Physikalisch-Technische Bundesanstalt (PTB)
        Section Neutron Dosimetry
        Bundesallee 100
        D-3300 Braunschweig, FRG

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16. MATERIAL AVAILABLE

NEA-1126/01

File name	File description	Records
NEA1126_01.001	Information file	128
NEA1126_01.002	COLLI Fortran source	3944
NEA1126_01.003	CONVERT Fortran source	15
NEA1126_01.004	Data file 10	69
NEA1126_01.005	Data file 11	49
NEA1126_01.006	Data file 20	119
NEA1126_01.007	Data file 30	8986
NEA1126_01.008	Command file to assign input files for COLLI	7
NEA1126_01.009	Output sample pb (SLATEC random generator)	3120
NEA1126_01.010	COLLI Manual pages 1-19	0
NEA1126_01.011	COLLI Manual pages 20-25	0
NEA1126_01.012	COLLI Manual pages 26	0
NEA1126_01.013	COLLI Manual pages 27-29	0
NEA1126_01.014	COLLI Manual pages 30-42	0
NEA1126_01.015	COLLI Manual pages 43-45	0

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17. CATEGORIES

J. Gamma Heating and Shield Design

Keywords: Monte Carlo method, fast neutrons, neutron flux, neutron spectra, scattering, shielding, transport theory.