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SUBROUTINE DOORS_SN(IPTRK,NANIS,NREG,NMAT,NUN,MATCOD,SIGG,SUNKNO,FUNKNO)
!
!-----------------------------------------------------------------------
!
!Purpose:
! Compute the source for the solution of SN equations.
!
!Copyright:
! Copyright (C) 2025 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 and C. Bienvenue
!
!Parameters: input
! IPTRK pointer to the tracking LCM object.
! NANIS maximum cross section Legendre order (=0: isotropic).
! NREG number of regions.
! NMAT number of mixtures.
! NUN number of unknowns per energy group including spherical
! harmonic terms and boundary SN fluxes.
! MATCOD mixture indices.
! SIGG cross section.
! FUNKNO optional unknown vector. If not present, a flat flux
! approximation is assumed.
!
!Parameters: output
! SUNKNO sources.
!
!-----------------------------------------------------------------------
!
USE GANLIB
!----
! SUBROUTINE ARGUMENTS
!----
TYPE(C_PTR) IPTRK
INTEGER NANIS,NREG,NMAT,NUN,MATCOD(NREG)
REAL SIGG(0:NMAT,NANIS+1),SUNKNO(NUN)
REAL, OPTIONAL :: FUNKNO(NUN)
!----
! LOCAL VARIABLES
!----
PARAMETER(NSTATE=40)
INTEGER JPAR(NSTATE),P,P2,ILP
!----
! ALLOCATABLE ARRAYS
!----
TYPE(C_PTR) IL_PTR,IM_PTR
INTEGER, POINTER, DIMENSION(:) :: IL,IM
!----
! RECOVER SNT SPECIFIC PARAMETERS.
!----
CALL LCMGET(IPTRK,'STATE-VECTOR',JPAR)
IF(JPAR(1).NE.NREG) CALL XABORT('DOORS_SN: INCONSISTENT NREG.')
IF(JPAR(2).NE.NUN) CALL XABORT('DOORS_SN: INCONSISTENT NUN.')
ITYPE=JPAR(6)
NSCT=JPAR(7)
IELEM=JPAR(8)
ISCAT=JPAR(16)
CALL LCMGPD(IPTRK,'IL',IL_PTR)
CALL LCMGPD(IPTRK,'IM',IM_PTR)
CALL C_F_POINTER(IL_PTR,IL,(/ NSCT /))
CALL C_F_POINTER(IM_PTR,IM,(/ NSCT /))
!----
! CONSTRUCT THE SOURCE. LOOP OVER LEGENDRE ORDERS.
!----
IOF0=0
DO P=1,NSCT
ILP=IL(P)
IF(ILP.GT.MIN(ISCAT-1,NANIS)) CYCLE
IF((ITYPE.EQ.2).OR.(ITYPE.EQ.4)) THEN
!----
! SLAB OR SPHERICAL 1D CASE.
!----
IF(PRESENT(FUNKNO)) THEN
DO IR=1,NREG
IBM=MATCOD(IR)
IF(IBM.LE.0) CYCLE
DO IEL=1,IELEM
IND=(IR-1)*NSCT*IELEM+IELEM*(P-1)+IEL
SUNKNO(IND)=SUNKNO(IND)+FUNKNO(IND)*SIGG(IBM,ILP+1)
ENDDO ! IEL
ENDDO ! IR
ELSE
! a flat flux is assumed
DO IR=1,NREG
IBM=MATCOD(IR)
IF(IBM.LE.0) CYCLE
IND=(IR-1)*NSCT*IELEM+IELEM*(P-1)+1
SUNKNO(IND)=SUNKNO(IND)+SIGG(IBM,ILP+1)
ENDDO ! IR
ENDIF
ELSE IF(ITYPE.EQ.3) THEN
!----
! CYLINDRICAL 1D CASE.
!----
IF(PRESENT(FUNKNO)) THEN
DO P2=0,P-1
IF(MOD((P-1)+P2,2).EQ.1) CYCLE
IOF0=IOF0+1
DO IR=1,NREG
IBM=MATCOD(IR)
IF(IBM.LE.0) CYCLE
IND=(IR-1)*NSCT+IOF0
SUNKNO(IND)=SUNKNO(IND)+FUNKNO(IND)*SIGG(IBM,ILP+1)
ENDDO ! IR
ENDDO ! P2
ELSE
! a flat flux is assumed
DO P2=0,P-1
IF(MOD((P-1)+P2,2).EQ.1) CYCLE
IOF0=IOF0+1
DO IR=1,NREG
IBM=MATCOD(IR)
IF(IBM.LE.0) CYCLE
IND=(IR-1)*NSCT+IOF0
SUNKNO(IND)=SUNKNO(IND)+SIGG(IBM,ILP+1)
ENDDO ! IR
ENDDO ! P2
ENDIF
ELSE IF((ITYPE.EQ.5).OR.(ITYPE.EQ.6).OR.(ITYPE.EQ.8)) THEN
!----
! 2D CASES (CARTESIAN OR R-Z).
!----
NM=IELEM**2
IF(PRESENT(FUNKNO)) THEN
DO IR=1,NREG
IBM=MATCOD(IR)
IF(IBM.LE.0) CYCLE
DO IEL=1,NM
IND=(IR-1)*NSCT*NM+(P-1)*NM+IEL
SUNKNO(IND)=SUNKNO(IND)+FUNKNO(IND)*SIGG(IBM,ILP+1)
ENDDO ! IEL
ENDDO ! IR
ELSE
! a flat flux is assumed
DO IR=1,NREG
IBM=MATCOD(IR)
IF(IBM.LE.0) CYCLE
IND=(IR-1)*NSCT*NM+(P-1)*NM+1
SUNKNO(IND)=SUNKNO(IND)+SIGG(IBM,ILP+1)
ENDDO ! IR
ENDIF
! a flat flux is assumed
ELSE IF((ITYPE.EQ.7).OR.(ITYPE.EQ.9)) THEN
!----
! 3D CARTESIAN CASE
!----
NM=IELEM**3
IF(PRESENT(FUNKNO)) THEN
DO IR=1,NREG
IBM=MATCOD(IR)
IF(IBM.LE.0) CYCLE
DO IEL=1,NM
IND=(IR-1)*NSCT*NM+(P-1)*NM+IEL
SUNKNO(IND)=SUNKNO(IND)+FUNKNO(IND)*SIGG(IBM,ILP+1)
ENDDO ! IEL
ENDDO ! IR
ELSE
! a flat flux is assumed
DO IR=1,NREG
IBM=MATCOD(IR)
IF(IBM.LE.0) CYCLE
IND=(IR-1)*NSCT*NM+(P-1)*NM+1
SUNKNO(IND)=SUNKNO(IND)+SIGG(IBM,ILP+1)
ENDDO ! IR
ENDIF
ELSE
CALL XABORT('DOORS_SN: TYPE OF DISCRETIZATION NOT IMPLEMENTED.')
ENDIF
ENDDO ! P
RETURN
END SUBROUTINE DOORS_SN
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