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*DECK MCGFFAT
SUBROUTINE MCGFFAT(SUBSCH,K,KPN,M,N,H,NOM,NZON,XST,SP,SM,NREG,NMU,
1 NANI,NFUNL,TRHAR,KEYFLX,KEYCUR,IMU,F,B)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Solution of transport equation on a track
* ray-tracing (anisotropic scattering,'MOCC/MCI' integration strategy).
*
*Copyright:
* Copyright (C) 2002 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): I. Suslov and R. Le Tellier
*
*Parameters: input
* SUBSCH track coefficients calculation subroutine.
* K total number of volumes for which specific values
* of the neutron flux and reactions rates are required.
* KPN total number of unknowns in vectors F.
* M number of material mixtures.
* N number of elements in the current track.
* H vector containing the lenght of the different segments of this
* track.
* NOM vector containing the region number of the different segments
* of this track.
* NZON index-number of the mixture type assigned to each volume.
* XST macroscopic total cross section.
* SP total source vector for + direction.
* SM total source vector for - direction.
* NREG number of volumes.
* NMU order of the polar quadrature set.
* NANI scattering anisotropy (=1 for isotropic scattering).
* NFUNL number of moments of the flux (in 2D : NFUNL=NANI*(NANI+1)/2).
* TRHAR spherical harmonics components for this angle in the plane.
* KEYFLX position of flux elements in PHI vector.
* KEYCUR position of current elements in PHI vector.
* IMU azimuthal angle corresponding to this track.
*
*Parameters: input/output
* F vector containing the zonal scalar flux.
*
*Parameters: scratch
* B undefined.
*
*-----------------------------------------------------------------------
*
IMPLICIT NONE
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER K,KPN,M,N,NOM(N),NZON(K),NMU,NFUNL,NREG,
1 KEYFLX(NREG,NFUNL),KEYCUR(K-NREG),IMU,NANI
REAL XST(0:M),TRHAR(NMU,NFUNL,2)
DOUBLE PRECISION H(N),SP(N),SM(N),F(KPN),B(N)
EXTERNAL SUBSCH
*----
* LOCAL VARIABLES
*---
DOUBLE PRECISION F0,RP,RM
INTEGER I,NOMI,IND,IND1,INDN,JF,J,NOMJ
*----
* Calculation of the coefficients for this track.
*----
* MCGSCAT: Step-Characteristics Scheme with Tabulated Exponentials
* MCGDDFT: Diamond-Differencing Scheme
* MCGSCET: Step-Characteristics Scheme with Exact Exponentials
IF(NANI.LE.0) CALL XABORT('MCGFFAT: INVALID VALUE OF NANI.')
CALL SUBSCH(N,K,M,NOM,NZON,H,XST,B)
*----
* Summation along the track in both directions
*----
* incoming flux in + direction
IND1=KEYCUR(-NOM(1))
RP=SP(1)
* incoming flux in - direction
INDN=KEYCUR(-NOM(N))
RM=SM(N)
DO I=2,N-1
* + direction
NOMI=NOM(I)
F0=B(I)*(RP-SP(I))
RP=RP-F0
DO JF=1,NFUNL
IND=KEYFLX(NOMI,JF)
F(IND)=F(IND)+F0*TRHAR(IMU,JF,1)
ENDDO
* - direction
J=N+1-I
NOMJ=NOM(J)
F0=B(J)*(RM-SM(J))
RM=RM-F0
DO JF=1,NFUNL
IND=KEYFLX(NOMJ,JF)
F(IND)=F(IND)+F0*TRHAR(IMU,JF,2)
ENDDO
ENDDO
* outgoing flux in + direction
F(INDN)=F(INDN)+RP
* outgoing flux in - direction
F(IND1)=F(IND1)+RM
*
RETURN
END
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