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*DECK FLUALB
SUBROUTINE FLUALB(IPSYS,NREGIO,NUNKNO,IR,MATCOD,VOLUME,KEYFLX,
> FUNKNO,SUNKNO,SIGS0,SIGT0,F1,F2)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Computes information related to an albedo search.
*
*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): A. Hebert
*
*Parameters: input
* IPSYS pointer to the pij object (L_PIJ signature).
* NREGIO total number of volumes in the domain.
* NUNKNO number of unknown in the system.
* IR number of mixtures.
* MATCOD mixture index in each volume.
* VOLUME volumes.
* KEYFLX index pointing to the average fluxes in vector FUNKNO.
* FUNKNO unknowns.
* SUNKNO sources.
* SIGS0 within-group scattering macroscopic cross sections of each
* mixture.
* SIGT0 total macroscopic cross sections of each mixture.
*
*Parameters: output
* F1 first part of the neutron flux.
* F2 second part of the neutron flux.
*
*-----------------------------------------------------------------------
*
USE GANLIB
*----
* SUBROUTINE ARGUMENTS
*----
TYPE(C_PTR) IPSYS
INTEGER NREGIO,NUNKNO,IR,MATCOD(NREGIO),KEYFLX(NREGIO)
REAL VOLUME(NREGIO),FUNKNO(NUNKNO),SUNKNO(NUNKNO),
> SIGS0(0:IR),SIGT0(0:IR),F1(NREGIO),F2(NREGIO)
*----
* ALLOCATABLE ARRAYS
*----
REAL, ALLOCATABLE, DIMENSION(:) :: WORK
*----
* SCRATCH STORAGE ALLOCATION
*----
ALLOCATE(WORK(NREGIO**2))
*----
* READ PIS MATRIX
*----
CALL LCMLEN(IPSYS,'DRAGON-WIS',ILCMLN,ITYLCM)
IF(ILCMLN.EQ.NREGIO) THEN
CALL LCMGET(IPSYS,'DRAGON-WIS',F2)
ELSE
CALL LCMLIB(IPSYS)
CALL XABORT('FLUALB: THE ALBS OPTION OF THE ASM: MODULE HAVE N'
> //'OT BEEN ACTIVATED.')
ENDIF
*
ZNUM=0.0
ZDEN=0.0
DO 10 I=1,NREGIO
ZNUM=ZNUM+VOLUME(I)*FUNKNO(KEYFLX(I))
ZDEN=ZDEN+VOLUME(I)*(SIGT0(MATCOD(I))-SIGS0(MATCOD(I)))*F2(I)
10 CONTINUE
ZNUM=-ZNUM/ZDEN
*----
* READ SCATTERING MODIFIED CP MATRIX.
*----
CALL LCMLEN(IPSYS,'DRAGON-PCSCT',ILCMLN,ITYLCM)
IF(ILCMLN.EQ.NREGIO**2) THEN
CALL LCMGET(IPSYS,'DRAGON-PCSCT',WORK)
ELSE
CALL LCMLIB(IPSYS)
CALL XABORT('FLUALB: THE SCATTERING MODIFIED PIJ ARE ABSENT FR'
> //'OM LCM.')
ENDIF
*
DO 20 I=1,NREGIO
F2(I)=F2(I)*ZNUM
F1(I)=0.0
20 CONTINUE
DO 40 J=1,NREGIO
SSS=SUNKNO(KEYFLX(J))
IOF=(J-1)*NREGIO
DO 30 I=1,NREGIO
F1(I)=F1(I)+WORK(IOF+I)*SSS
30 CONTINUE
40 CONTINUE
*----
* SCRATCH STORAGE DEALLOCATION
*----
DEALLOCATE(WORK)
RETURN
END
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