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*DECK MCGDDFL
SUBROUTINE MCGDDFL(N,K,M,NOM,NZON,H,XST,B)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Calculate coefficients of a track for the characteristics
* integration.
* DD1 Diamond-Differencing scheme without fix-up with
* 'source term isolation' option turned off.
*
*Copyright:
* Copyright (C) 2015 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version
*
*Author(s): A. Hebert
*
*Parameters: input
* N number of elements in the current track.
* K total number of volumes for which specific values
* of the neutron flux and reactions rates are required.
* M number of material mixtures.
* NOM vector containing the region number of the different segments
* of this track.
* NZON index-number of the mixture type assigned to each volume.
* H vector containing the lenght of the different segments of this
* track.
* XST macroscopic total cross section.
*
*Parameters: output
* B DD1 coefficients.
*
*-----------------------------------------------------------------------
*
IMPLICIT NONE
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER N,K,M,NOM(N),NZON(K)
REAL XST(0:M)
DOUBLE PRECISION H(N),B(0:5,N)
*---
* LOCAL VARIABLES
*---
INTEGER I,NOMI,NZI
DOUBLE PRECISION SQ3,TAUD,HID,H2,H3,DEN
*
SQ3=SQRT(3.0D0)
DO I=2,N-1
NOMI=NOM(I)
NZI=NZON(NOMI)
HID=H(I)
TAUD=HID*XST(NZI)
H2=HID*HID
H3=H2*HID
DEN=(TAUD+6.0D0)*TAUD+12.0D0
B(0,I)=((TAUD-6.0D0)*TAUD+12.0D0)/DEN
B(1,I)=12.0D0*HID/DEN
B(2,I)=H2*(TAUD+6.0D0)/DEN
B(3,I)=-2.0D0*SQ3*H3/DEN
B(4,I)=-2.0D0*SQ3*TAUD/DEN
B(5,I)=H3/DEN
ENDDO
*
RETURN
END
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