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NEA-0636 BASKER/FLAKER.VIWI

VIWI, Neutron Speeds and Weights for Scattering Kernel Calculation
BASKER, Isotropic Scattering Kernel Calculation Using VIWI
FLAKER, Legendre Moments from Scattering Law Tables

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1. NAME OR DESIGNATION OF PROGRAM:  BASKER, FLAKER and VIWI.
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2. COMPUTERS
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Program name Package id Status Status date
BASKER/FLAKER NEA-0636/01 Arrived 24-AUG-2001
VIWI NEA-0636/02 Arrived 24-AUG-2001

Machines used:

Package ID Orig. computer Test computer
NEA-0636/01 IBM 360 series
NEA-0636/02 IBM 360 series
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3. DESCRIPTION OF PROBLEM OR FUNCTION

These three programs are concerned with scattering kernel calculations using energy points. The calculations are made using the speed rather than the energy variable as the functions considered vary generally more smoothly in the former variable. VIWI calculates the speed points and associated weights for all energy intervals. BASKER calculates the isotropic scattering kernel using the points and weights calculated by VIWI. FLAKER calculates the desired Legendre moments of the scattering kernel.
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4. METHOD OF SOLUTION

The variation of flux between energy points is  accounted for using a Lagrange interpolation method. The speed points have been chosen with the suitability of Pu systems as a major goal. The calculated points and weights are written on file by VIWI, as well as the ordinary Gaussian points and weights.
BASKER uses the free gas or Brown-St. John model to calculate the isotropic scattering kernel. FLAKER calculates the Legendre moments  using any tabulated scattering law (given as input).
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:
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6. TYPICAL RUNNING TIME:
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS

BASKER and FLAKER are modifications of BASK and FLANGE which are scattering kernel programs that use energy intervals.
NEA-0636/01
FACEL

NEA-0636/02
FACEL
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9. STATUS
Package ID Status date Status
NEA-0636/01 24-AUG-2001 Masterfiled Arrived
NEA-0636/02 24-AUG-2001 Masterfiled Arrived
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10. REFERENCES

- A. Rastas:
  (BASK)
  RKR 1970, Memo 13.
- A. Rastas:
  (FLANGE)
  RKR 1971, Memo 12.
NEA-0636/01, included references:
- Jorma Karppinen:
  "Scattering Kernel Calculations in the Energy Point Method,
  Description of Programs VIWI, BASKER and FLAKER"
  RAR 1973, Memo 6.
NEA-0636/02, included references:
- Jorma Karppinen:
  "Scattering Kernel Calculations in the Energy Point Method,
  Description of Programs VIWI, BASKER and FLAKER"
  RAR 1973, Memo 6.
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11. MACHINE REQUIREMENTS

VIWI requires a single input/output unit to output points and weights.  BASKER requires 3 units:

Unit

17 speed points and weights calculated by VIWI
7 temporary storage for main and auxiliary kernels
25 calculated energy point kernels output.
FLAKER requires 7 units:
3 temporary storage
9 scattering law input
13 temporary storage for auxiliary kernels
8 temporary storage for main kernels
17 speed points and weights input
19 temporary storage for energy points and weights
25 output
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0636/01 FORTRAN-IV
NEA-0636/02 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHOR

          Jorma Karppinen
          Nuclear Engineering Laboratory
          Technical Research Centre of Finland
          Finland.
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16. MATERIAL AVAILABLE
NEA-0636/01
source program   mag tapesource program   mag tape                  SRCTP
source program   mag tapesource program   mag tape                  SRCTP
report                   RAR 1973, Memo 6                           REPPT

NEA-0636/02
source program   mag tapesource program   mag tape                  SRCTP
report                   RAR 1973, Memo 6                           REPPT
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17. CATEGORIES
  • B. Spectrum Calculations, Generation of Group Constants and Cell Problems

Keywords: Lagrange equations, kernels, legendre polynomials, scattering, scattering law.